JEE Main & Advanced Chemistry Chemical Bonding and Molecular Structure / रासायनिक आबंधन एवं आणविक संरचना Question Bank

done Molecular orbital theory Total Questions - 84

• question_answer1)
  Bond order is a concept in the molecular orbital theory. It depends on the number of electrons in the bonding and antibonding orbitals. Which of the following statements is true about it ? The bond order [AIIMS 1980]
  A)
                  Can have a negative quantity done clear
  B)
                  Has always an integral value done clear
  C)
                  Can assume any positive or integral or fractional value including zero done clear
  D)
                  Is a nonzero quantity done clear
  View Solution play_arrow

• question_answer2)
  The bond order of \[NO\] molecule is    [MP PET 1996]
  A)
                  1              done clear
  B)
                  2 done clear
  C)
                  2.5          done clear
  D)
                  3 done clear
  View Solution play_arrow

• question_answer3)
  When two atomic orbitals combine they form
  A)
                  One molecular orbital    done clear
  B)
                  Two molecular orbital done clear
  C)
                  Three molecular orbital done clear
  D)
                  Four molecular orbital done clear
  View Solution play_arrow

• question_answer4)
  Which of the following species is the least stable
  A)
                  \[{{O}_{2}}\]      done clear
  B)
                  \[O_{2}^{-2}\] done clear
  C)
                  \[O_{2}^{+1}\]  done clear
  D)
                  \[O_{2}^{-1}\] done clear
  View Solution play_arrow

• question_answer5)
  The bond order is maximum in [AIIMS 1983, 85; CBSE PMT 1994; MP PET 2002]
  A)
                  \[{{O}_{2}}\]      done clear
  B)
                  \[O_{2}^{-1}\] done clear
  C)
                  \[O_{2}^{+1}\]  done clear
  D)
                  \[O_{2}^{-2}\] done clear
  View Solution play_arrow

• question_answer6)
  Which of the following compounds of boron does not exist in the free form
  A)
                  \[BC{{l}_{3}}\]   done clear
  B)
                  \[B{{F}_{3}}\] done clear
  C)
                  \[BB{{r}_{3}}\]   done clear
  D)
                  \[B{{H}_{3}}\] done clear
  View Solution play_arrow

• question_answer7)
  Molecular orbital theory was developed mainly by [BHU 1987; Pb. CET 2003]
  A)
                  Pauling done clear
  B)
                  Pauling and Slater done clear
  C)
                  Mulliken              done clear
  D)
                  Thomson done clear
  View Solution play_arrow

• question_answer8)
  The bond order of a molecule is given by              [NCERT 1984]
  A)
                  The difference between the number of electrons in bonding and antibonding orbitals done clear
  B)
                  Total number of electrons in bonding and antibonding orbitals done clear
  C)
                  Twice the difference between the number of electrons in bonding and antibonding electrons done clear
  D)
                  Half the difference between the number of electrons in bonding and antibonding electrons done clear
  View Solution play_arrow

• question_answer9)
  Oxygen molecule is paramagnetic because [NCERT 1984; IIT 1984]
  A)
                  Bonding electrons are more than antibonding electrons done clear
  B)
                  Contains unpaired electrons done clear
  C)
                  Bonding electrons are less than antibonding electrons done clear
  D)
                  Bonding electrons are equal to antibonding electrons done clear
  View Solution play_arrow

• question_answer10)
  Which one is paramagnetic from the following [IIT 1989; CBSE PMT 1995]
  A)
                  \[O_{2}^{-}\]     done clear
  B)
                  \[NO\] done clear
  C)
                  Both A and B      done clear
  D)
                  \[C{{N}^{-}}\] done clear
  View Solution play_arrow

• question_answer11)
  The bond order in  \[C{{H}_{3}}Cl\] ion is               [Pb. CET 2004]
  A)
                  1              done clear
  B)
                  2 done clear
  C)
                  2.5          done clear
  D)
                  3 done clear
  View Solution play_arrow

• question_answer12)
  Out of the following which has smallest bond length                                                 [RPMT 1997]
  A)
                   \[{{O}_{2}}\]     done clear
  B)
                  \[O_{2}^{+}\] done clear
  C)
                  \[O_{2}^{-}\]     done clear
  D)
                  \[O_{2}^{2-}\] done clear
  View Solution play_arrow

• question_answer13)
  Which of the following molecule is paramagnetic                         [CPMT 1980; RPET 1999;MP PMT 1999; RPMT 2000]
  A)
                  Chlorine               done clear
  B)
                  Nitrogen done clear
  C)
                  Oxygen                done clear
  D)
                  Hydrogen done clear
  View Solution play_arrow

• question_answer14)
  Which molecule has the highest bond order
  A)
                  \[{{N}_{2}}\]      done clear
  B)
                  \[L{{i}_{2}}\] done clear
  C)
                  \[H{{e}_{2}}\]    done clear
  D)
                  \[{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer15)
  The molecular electronic configuration of \[H_{2}^{-}\] ion is
  A)
                  \[{{\left( \sigma \,1s \right)}^{2}}\]          done clear
  B)
                  \[{{\left( \sigma \,1s \right)}^{2}}{{\left( {{\sigma }^{x}}1s \right)}^{2}}\] done clear
  C)
                  \[NO\]  done clear
  D)
                  \[{{\left( \sigma \,1s \right)}^{3}}\] done clear
  View Solution play_arrow

• question_answer16)
  The paramagnetic nature of oxygen molecule is best explained on the basis of                                  [BHU 1996]
  A)
                  Valence bond theory     done clear
  B)
                  Resonance done clear
  C)
                  Molecular orbital theory               done clear
  D)
                  Hybridization done clear
  View Solution play_arrow

• question_answer17)
  In which case the bond length is minimum between carbon and nitrogen
  A)
                  \[C{{H}_{3}}N{{H}_{2}}\]               done clear
  B)
                  \[{{C}_{6}}{{H}_{5}}CH=NOH\] done clear
  C)
                  \[C{{H}_{3}}CON{{H}_{2}}\]         done clear
  D)
                  \[C{{H}_{3}}CN\] done clear
  View Solution play_arrow

• question_answer18)
  Which one of the following species is diamagnetic in nature [AIEEE 2005]
  A)
                  \[He_{2}^{+}\]  done clear
  B)
                  H2 done clear
  C)
                  \[H_{2}^{+}\]     done clear
  D)
                  \[H_{2}^{-}\] done clear
  View Solution play_arrow

• question_answer19)
  Which one of the following oxides is expected exhibit paramagnetic behaviour                 [CBSE PMT 2005]
  A)
                  \[C{{O}_{2}}\]    done clear
  B)
                  \[S{{O}_{2}}\] done clear
  C)
                  \[Cl{{O}_{2}}\]   done clear
  D)
                  \[Si{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer20)
  The bond order in \[{{N}_{2}}\] molecule is [CBSE 1995; Pb. PMT 1999; MP PET 1997]
  A)
                  1              done clear
  B)
                  2 done clear
  C)
                  3              done clear
  D)
                  4 done clear
  View Solution play_arrow

• question_answer21)
  Which one is paramagnetic and has the bond order 1/2                                                 [NCERT 1983]
  A)
                  \[{{O}_{2}}\]      done clear
  B)
                  \[{{N}_{2}}\] done clear
  C)
                  \[{{F}_{2}}\]       done clear
  D)
                  \[H_{2}^{+}\] done clear
  View Solution play_arrow

• question_answer22)
  When two atoms of chlorine combine to form one molecule of chlorine gas, the energy of the molecule               [AMU 1982]
  A)
                  Greater than that of separate atoms done clear
  B)
                  Equal to that of separate atoms done clear
  C)
                  Lower than that of separate atoms done clear
  D)
                  None of the above statement is correct done clear
  View Solution play_arrow

• question_answer23)
  An atom of an element A has three electrons in its outermost shell and that of B has six electrons in the outermost shell. The formula of the compound between these two will be            [CPMT 1974, 84; RPMT 1999]
  A)
                  \[{{A}_{3}}{{B}_{4}}\]     done clear
  B)
                  \[{{A}_{2}}{{B}_{3}}\] done clear
  C)
                  \[{{A}_{3}}{{B}_{2}}\]     done clear
  D)
                  \[{{A}_{2}}{{B}_{3}}\] done clear
  View Solution play_arrow

• question_answer24)
  The bond order of individual carbon-carbon bonds in benzene is                                               [IIT 1980]
  A)
                  One       done clear
  B)
                  Two done clear
  C)
                  Between 1 and 2              done clear
  D)
                  One and two alternately done clear
  View Solution play_arrow

• question_answer25)
  \[PC{{l}_{5}}\] exists but \[NC{{l}_{5}}\]does not because [EAMCET 1977; MP PET/PMT 1988]
  A)
                  Nitrogen has no vacant d-orbitals done clear
  B)
                  \[NC{{l}_{5}}\]is unstable done clear
  C)
                  Nitrogen atom is much smaller done clear
  D)
                  Nitrogen is highly inert done clear
  View Solution play_arrow

• question_answer26)
  Paramagnetism is exhibited by molecules [NCERT 1979; MP PET 2002]
  A)
                  Not attracted into a magnetic field done clear
  B)
                  Containing only paired electrons done clear
  C)
                  Carrying a positive charge done clear
  D)
                  Containing unpaired electrons done clear
  View Solution play_arrow

• question_answer27)
  Which one of the following is paramagnetic         [DPMT 1985]
  A)
                  \[{{H}_{2}}O\]   done clear
  B)
                  \[N{{O}_{2}}\] done clear
  C)
                  \[S{{O}_{2}}\]    done clear
  D)
                  \[C{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer28)
  The energy of a \[2p\]orbital except hydrogen atom is [AMU 1983]
  A)
                  Less than that of \[s{{p}^{2}}\] orbital done clear
  B)
                  More than that of \[2s\]orbital done clear
  C)
                  Equal to that of \[2s\] orbital done clear
  D)
                  Double that of \[2s\] orbital done clear
  View Solution play_arrow

• question_answer29)
  In the electronic structure of acetic acid, there are [AMU 1983]
  A)
                  16 shared and 8 unshared electrons done clear
  B)
                  8 shared and 16 unshared electrons done clear
  C)
                  12 shared and 12 unshared electrons done clear
  D)
                  18 shared and 6 unshared electrons done clear
  View Solution play_arrow

• question_answer30)
  Which of the following does not exist on the basis of molecular orbital theory    [AFMC 1990; MP PMT 1996]
  A)
                  \[H_{2}^{+}\]     done clear
  B)
                  \[He_{2}^{+}\] done clear
  C)
                  \[H{{e}_{2}}\]    done clear
  D)
                  \[L{{i}_{2}}\] done clear
  View Solution play_arrow

• question_answer31)
  In \[{{P}_{4}}{{O}_{10}},\] the number of oxygen atoms attached to each phosphorus atom is                                    [IIT 1995]
  A)
                  2              done clear
  B)
                  3              done clear
  C)
                  4              done clear
  D)
                  2.5 done clear
  View Solution play_arrow

• question_answer32)
  Of the following statements which one is correct
  A)
                  Oxygen and nitric oxide molecules are both paramagnetic because both contain unpaired electrons done clear
  B)
                  Oxygen and nitric oxide molecules are both diamagnetic because both contain no unpaired electrons done clear
  C)
                  Oxygen is paramagnetic because it contains unpaired electrons, while nitric oxide is diamagnetic because it contains no unpaired electrons done clear
  D)
                  Oxygen is diamagnetic because it contains no unpaired electrons, while nitric oxide is paramagnetic because it contains an unpaired electron done clear
  View Solution play_arrow

• question_answer33)
  According to the molecular orbital theory, the bond order in \[{{C}_{2}}\] molecule is
  A)
                  0              done clear
  B)
                  1 done clear
  C)
                  2              done clear
  D)
                  3 done clear
  View Solution play_arrow

• question_answer34)
  The molecular orbital configuration of a diatomic molecule is                 \[\sigma \,\,1{{s}^{2}}\,\,{{\sigma }^{*}}\,\,1{{s}^{2}}\,\sigma \,\,2{{s}^{2}}\,{{\sigma }^{*}}\,2{{s}^{2}}\,\,\sigma \,2p_{x}^{2}\,\left\{ {}_{\pi \,2p_{z}^{2}}^{\pi \,2p_{y}^{2}} \right.\]                 Its bond order is
  A)
                  3 done clear
  B)
                  2.5 done clear
  C)
                  2              done clear
  D)
                  1 done clear
  View Solution play_arrow

• question_answer35)
  The difference in energy between the molecular orbital formed and the combining atomic orbitals is called
  A)
                  Bond energy      done clear
  B)
                  Activation energy done clear
  C)
                  Stabilization energy        done clear
  D)
                  Destabilization energy done clear
  View Solution play_arrow

• question_answer36)
  According to molecular orbital theory, the paramagnetism of \[{{O}_{2}}\] molecule is due to presence of            [MP PMT 1997]
  A)
                  Unpaired electrons in the bonding \[\sigma \] molecular orbital done clear
  B)
                  Unpaired electrons in the antibonding \[\sigma \]molecular orbital done clear
  C)
                  Unpaired electron in the bonding \[\pi \] molecular orbital done clear
  D)
                  Unpaired electrons in the antibonding \[\pi \]molecular orbital done clear
  View Solution play_arrow

• question_answer37)
  The bond order in \[O_{2}^{+}\] is           [MP PET 1999; BHU 2001]
  A)
                  2              done clear
  B)
                  2.5 done clear
  C)
                  1.5          done clear
  D)
                  3 done clear
  View Solution play_arrow

• question_answer38)
  Which of the following is paramagnetic  [MP PET 1999]
  A)
                  \[{{O}_{2}}\]      done clear
  B)
                  \[C{{N}^{-}}\] done clear
  C)
                  \[CO\]   done clear
  D)
                  \[N{{O}^{+}}\] done clear
  View Solution play_arrow

• question_answer39)
  If \[{{N}_{x}}\]is the number of bonding orbitals of an atom and \[{{N}_{y}}\] is the number of antibonding orbitals, then the molecule/atom will be stable if          [DPMT 1996]
  A)
                  \[{{N}_{x}}>{{N}_{y}}\] done clear
  B)
                  \[{{N}_{x}}={{N}_{y}}\] done clear
  C)
                  \[{{N}_{x}}<{{N}_{y}}\] done clear
  D)
                  \[{{N}_{x}}\le {{N}_{y}}\] done clear
  View Solution play_arrow

• question_answer40)
  Which of the following molecular orbitals has two nodal planes                                  [KCET 1996]
  A)
                  \[\sigma \,2s\]  done clear
  B)
                  \[\pi \,2{{p}_{y}}\] done clear
  C)
                  \[{{\pi }^{*}}\,2{{p}_{y}}\]           done clear
  D)
                  \[{{\sigma }^{*}}\,2{{p}_{x}}\] done clear
  View Solution play_arrow

• question_answer41)
  The number of nodal planes \['d'\] orbital has    [KCET 1996]
  A)
                  Zero       done clear
  B)
                  One done clear
  C)
                  Two       done clear
  D)
                  Three done clear
  View Solution play_arrow

• question_answer42)
  Atomic number of an element is 26. The element shows [CPMT 1996]
  A)
                  Ferromagnetism              done clear
  B)
                  Diamagnetism done clear
  C)
                  Paramagnetism                done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer43)
  What is correct sequence of bond order               [BHU 1997]
  A)
                  \[O_{2}^{+}>O_{2}^{-}>{{O}_{2}}\]         done clear
  B)
                  \[O_{2}^{+}>{{O}_{2}}>O_{2}^{-}\] done clear
  C)
                  \[{{O}_{2}}>O_{2}^{-}>O_{2}^{+}\]         done clear
  D)
                  \[O_{2}^{-}>O_{2}^{+}>{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer44)
  Which bond is strongest                       [RPMT 1997]
  A)
                  \[F-F\]  done clear
  B)
                  \[Br-F\] done clear
  C)
                  \[Cl-F\] done clear
  D)
                  \[I-F\] done clear
  View Solution play_arrow

• question_answer45)
  Which of the following is not paramagnetic          [AIIMS 1997]
  A)
                  \[{{S}^{-2}}\]      done clear
  B)
                  \[{{N}_{2}}^{-}\] done clear
  C)
                  \[O_{2}^{-}\]     done clear
  D)
                  \[NO\] done clear
  View Solution play_arrow

• question_answer46)
  Which one of the following molecules is paramagnetic [Pb. PMT 1998]
  A)
                  \[C{{O}_{2}}\]    done clear
  B)
                  \[S{{O}_{2}}\] done clear
  C)
                  \[NO\]  done clear
  D)
                  \[{{H}_{2}}O\] done clear
  View Solution play_arrow

• question_answer47)
  \[{{N}_{2}}\] and \[{{O}_{2}}\] are converted into monoanions \[N_{2}^{-}\] and \[O_{2}^{-}\] respectively, which of the following statements is wrong [CBSE PMT 1997]
  A)
                  In \[{{N}_{2}},\] the \[N-N\] bond weakens done clear
  B)
                  In \[{{O}_{2}},\] the \[O-O\] bond order increases done clear
  C)
                  In\[{{O}_{2}},\] bond length increases done clear
  D)
                  \[N_{2}^{-}\] becomes diamagnetic done clear
  View Solution play_arrow

• question_answer48)
  With increasing bond order, stability of a bond [CET Pune 1998]
  A)
                  Remains unaltered          done clear
  B)
                  Decreases done clear
  C)
                  Increases             done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer49)
  Which is not paramagnetic           [DCE 1999, 2000]
  A)
                  \[{{O}_{2}}\]      done clear
  B)
                  \[O_{2}^{+}\] done clear
  C)
                  \[O_{2}^{2-}\]   done clear
  D)
                  \[O_{2}^{-}\] done clear
  View Solution play_arrow

• question_answer50)
  The number of antibonding electron pairs in \[O_{2}^{2-}\] molecular ion on the basis of molecular orbital theory is [Pb. PMT 2000]
  A)
                  4 done clear
  B)
                  3 done clear
  C)
                  2              done clear
  D)
                  5 done clear
  View Solution play_arrow

• question_answer51)
  The bond order of \[He_{2}^{+}\] molecule ion is [Pb. PMT 2000; Pb CET 2001]
  A)
                  1              done clear
  B)
                  2 done clear
  C)
                  \[\frac{1}{2}\]    done clear
  D)
                  \[\frac{1}{4}\] done clear
  View Solution play_arrow

• question_answer52)
  Which one does not exhibit paramagnetism        [DPMT 2000]
  A)
                  \[Cl{{O}_{2}}\]   done clear
  B)
                  \[ClO_{2}^{-}\] done clear
  C)
                  \[N{{O}_{2}}\]   done clear
  D)
                  \[NO\] done clear
  View Solution play_arrow

• question_answer53)
  In which of the following pairs the two molecules have identical bond order                                        [MP PMT 2000]
  A)
                  \[{{N}_{2}},O_{2}^{2+}\]              done clear
  B)
                  \[{{N}_{2}}\], \[O_{2}^{-}\] done clear
  C)
                  \[N_{2}^{-}\], \[{{O}_{2}}\]   done clear
  D)
                  \[O_{2}^{+}\], \[{{N}_{2}}\] done clear
  View Solution play_arrow

• question_answer54)
  The bond order is not three for [MP PMT 2001]
  A)
                  \[N_{2}^{+}\]    done clear
  B)
                  \[O_{2}^{2+}\] done clear
  C)
                  \[{{N}_{2}}\]      done clear
  D)
                  \[N{{O}^{+}}\] done clear
  View Solution play_arrow

• question_answer55)
  In \[{{H}_{2}}{{O}_{2}}\]molecule, the angle between the two O ? H planes is                                                    [CBSE PMT 2002]
  A)
                  \[{{90}^{o}}\]     done clear
  B)
                  \[{{101}^{o}}\] done clear
  C)
                  \[{{103}^{o}}\]  done clear
  D)
                  \[{{105}^{o}}\] done clear
  View Solution play_arrow

• question_answer56)
  Which of the following molecule has highest bond energy [AIIMS 2002]
  A)
                  \[F-F\] done clear
  B)
                  \[CC\] done clear
  C)
                  \[NN\]  done clear
  D)
                  \[OO\] done clear
  View Solution play_arrow

• question_answer57)
  Which of the following species would be expected paramagnetic                                             [UPSEAT 2002]
  A)
                  Copper crystals done clear
  B)
                  \[C{{u}^{+}}\] done clear
  C)
                  \[C{{u}^{++}}\] done clear
  D)
                  \[{{H}_{2}}\] done clear
  View Solution play_arrow

• question_answer58)
  Which of the following is correct for \[{{N}_{2}}\] triple bond [CPMT 2002]
  A)
                  3s            done clear
  B)
                  1p, 2s done clear
  C)
                  2p, 1s    done clear
  D)
                  3p done clear
  View Solution play_arrow

• question_answer59)
  In which of the following pairs molecules have bond order three and are isoelectronics [MP PET 2003]
  A)
                  \[C{{N}^{-}}\], CO done clear
  B)
                  \[N{{O}^{+}},\,\,C{{O}^{+}}\] done clear
  C)
                  \[C{{N}^{-}}\], \[O_{2}^{+}\]      done clear
  D)
                  CO, \[O_{2}^{+}\] done clear
  View Solution play_arrow

• question_answer60)
  Which of the following is paramagnetic  [MP PET 2003]
  A)
                  \[O_{2}^{+}\]    done clear
  B)
                          \[C{{N}^{-}}\] done clear
  C)
                  CO          done clear
  D)
                  \[{{N}_{2}}\] done clear
  View Solution play_arrow

• question_answer61)
  How many bonding electron pairs are there in white phosphorous                                           [MP PET 2003]
  A)
                  6              done clear
  B)
                  12 done clear
  C)
                  4              done clear
  D)
                  8 done clear
  View Solution play_arrow

• question_answer62)
  The atomicity of phosphorus is X and the \[P\hat{P}P\] bond angle in the molecule is Y. What are X and Y             [EAMCET 2003]
  A)
                  X = 4, Y = \[{{90}^{o}}\]  done clear
  B)
                  X = 4, Y = \[{{60}^{o}}\] done clear
  C)
                  X = 3, Y = \[{{120}^{o}}\]               done clear
  D)
                  X = 2, Y = \[{{180}^{o}}\] done clear
  View Solution play_arrow

• question_answer63)
  From elementary molecular orbital theory we can give the electronic configuration of the singly positive nitrogen molecular ion \[N_{2}^{+}\] as                                        [UPSEAT 2003]
  A)
                  \[\sigma {{(1s)}^{2}}{{\sigma }^{*}}{{(1s)}^{2}}\sigma {{(2s)}^{2}}{{\sigma }^{*}}{{(2s)}^{2}}\pi {{(2p)}^{4}}\sigma {{(2p)}^{1}}\] done clear
  B)
                          \[\sigma {{(1s)}^{2}}{{\sigma }^{*}}{{(1s)}^{2}}\sigma {{(2s)}^{2}}{{\sigma }^{*}}{{(2s)}^{2}}\sigma {{(2p)}^{1}}\pi {{(2p)}^{3}}\] done clear
  C)
                  \[\sigma {{(1s)}^{2}}{{\sigma }^{*}}{{(1s)}^{2}}\sigma {{(2s)}^{2}}{{\sigma }^{*}}{{(2p)}^{2}}\pi {{(2p)}^{4}}\] done clear
  D)
                  \[\sigma {{(1s)}^{2}}{{\sigma }^{*}}{{(1s)}^{2}}\sigma {{(2s)}^{2}}{{\sigma }^{*}}{{(2s)}^{2}}\sigma {{(2p)}^{2}}\pi {{(2p)}^{2}}\] done clear
  View Solution play_arrow

• question_answer64)
  The paramagnetic property of the oxygen molecule due to the presence of unpaired electorns present in [Kerala PMT 2004]
  A)
                  \[{{(\sigma 2{{p}_{x}})}^{1}}\] and \[{{({{\sigma }^{*}}2{{p}_{x}})}^{1}}\] done clear
  B)
                   \[{{(\sigma 2{{p}_{x}})}^{1}}\]and \[{{(\pi 2{{p}_{y}})}^{1}}\] done clear
  C)
                  \[{{(\pi *2{{p}_{y}})}^{1}}\] and \[{{(\pi *2{{p}_{z}})}^{1}}\] done clear
  D)
                  \[{{(\pi *2{{p}_{y}})}^{1}}\]and \[{{(\pi 2{{p}_{y}})}^{1}}\] done clear
  E)
                  \[{{(\pi *2{{p}_{z}})}^{1}}\] and \[{{(\pi 2{{p}_{z}})}^{1}}\] done clear
  View Solution play_arrow

• question_answer65)
  In \[PO_{4}^{3-}\]ion, the formal charge on each oxygen atom and \[P-O\]bond order respectively are  [DPMT 2004]
  A)
                  \[-0.75,\ 1.25\]  done clear
  B)
                  \[-0.75,\ 1.0\] done clear
  C)
                  \[-0.75,\ 0.6\]    done clear
  D)
                  \[-3,\ 1.25\] done clear
  View Solution play_arrow

• question_answer66)
  The bond order in \[CO_{3}^{2-}\]ion between \[C-O\] is [Pb. PMT 2004]
  A)
                  Zero       done clear
  B)
                  0.88 done clear
  C)
                  1.33        done clear
  D)
                  2 done clear
  View Solution play_arrow

• question_answer67)
  The bond order of \[O_{2}^{+}\] is the same as in            [CPMT 2004]
  A)
   \[N_{2}^{+}\]   done clear
  B)
                  \[C{{N}^{-}}\] done clear
  C)
                  \[CO\]   done clear
  D)
                  \[N{{O}^{+}}\] done clear
  View Solution play_arrow

• question_answer68)
  Bond order of \[{{O}_{2}}\]is      [DPMT  2004]
  A)
                  2              done clear
  B)
                          1.5 done clear
  C)
                  3              done clear
  D)
                  3.5 done clear
  View Solution play_arrow

• question_answer69)
  The total number of electron that takes part in forming bonds in \[{{N}_{2}}\]is [MP PET 2004]
  A)
                  2              done clear
  B)
                  4 done clear
  C)
                  6              done clear
  D)
                  10 done clear
  View Solution play_arrow

• question_answer70)
  The bond length the species \[{{O}_{2}},O_{2}^{+}\]and \[O_{2}^{-}\] are in the order of                                             [MP PET 2004]
  A)
                  \[O_{2}^{+}>{{O}_{2}}>O_{2}^{-}\]         done clear
  B)
                  \[O_{2}^{+}>O_{2}^{-}>{{O}_{2}}\] done clear
  C)
                  \[{{O}_{2}}>O_{2}^{+}>O_{2}^{-}\]         done clear
  D)
                  \[O_{2}^{-}>{{O}_{2}}>O_{2}^{+}\] done clear
  View Solution play_arrow

• question_answer71)
  According to molecular orbital theory which of the following statement about the magnetic character and bond order is correct regarding \[O_{2}^{+}\] [IIT JEE Screening 2004]
  A)
                  Paramagnetic and bond order<\[{{O}_{2}}\]       done clear
  B)
                  Paramagnetic and bond order>\[{{O}_{2}}\]       done clear
  C)
                  Dimagnetic and bond order<\[{{O}_{2}}\] done clear
  D)
                  Dimagnetic and bond order>\[{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer72)
  The bond order in NO is 2.5 while that in \[N{{O}^{+}}\]is 3. Which of the following statements is true for these two species [AIEEE 2004]
  A)
                  Bond length in \[N{{O}^{+}}\]is equal to that in \[NO\]   done clear
  B)
                  Bond length in \[NO\]is greater than in \[N{{O}^{+}}\] done clear
  C)
                  Bond length in \[N{{O}^{+}}\]is greater than in \[NO\] done clear
  D)
                  Bond length is unpredictable done clear
  View Solution play_arrow

• question_answer73)
  Which of the following is diamagnetic     [BVP 2004]
  A)
                  Oxygen molecule             done clear
  B)
                  Boron molecule done clear
  C)
                  \[N_{2}^{+}\]    done clear
  D)
                  None done clear
  View Solution play_arrow

• question_answer74)
  Bond energies in \[NO,\,N{{O}^{+}}\] and \[N{{O}^{-}}\] are such as [Pb. CET 2004]
  A)
                  \[N{{O}^{-}}>NO>N{{O}^{+}}\]  done clear
  B)
                  \[NO>N{{O}^{-}}>N{{O}^{+}}\] done clear
  C)
                  \[N{{O}^{+}}>NO>N{{O}^{-}}\]  done clear
  D)
                  \[N{{O}^{+}}>N{{O}^{-}}>NO\] done clear
  View Solution play_arrow

• question_answer75)
  Which of the following is paramagnetic  [UPSEAT 2004]
  A)
                  \[{{B}_{2}}\]       done clear
  B)
                  \[{{C}_{2}}\] done clear
  C)
                  \[{{N}_{2}}\]      done clear
  D)
                  \[{{F}_{2}}\] done clear
  View Solution play_arrow

• question_answer76)
  The paramagnetic molecule at ground state among the following is         [UPSEAT 2004]
  A)
                  \[{{H}_{2}}\]       done clear
  B)
                  \[{{O}_{2}}\] done clear
  C)
                  \[{{N}_{2}}\]      done clear
  D)
                  \[CO\] done clear
  View Solution play_arrow

• question_answer77)
  Which has the highest bond energy        [DCE 2002]
  A)
                  \[{{F}_{2}}\]       done clear
  B)
                  \[C{{l}_{2}}\] done clear
  C)
                  \[B{{r}_{2}}\]     done clear
  D)
                  \[{{I}_{2}}\] done clear
  View Solution play_arrow

• question_answer78)
  In \[O_{2}^{-},\] \[{{O}_{2}}\] and \[O_{2}^{-2}\] molecular species, the total number of antibonding electrons respectively are [DCE 2003]
  A)
                  7, 6, 8    done clear
  B)
                  1, 0, 2 done clear
  C)
                  6, 6, 6    done clear
  D)
                  8, 6, 8 done clear
  View Solution play_arrow

• question_answer79)
  Which of the following is not paramagnetic          [DCE 2002]
  A)
                  \[{{O}_{2}}\]      done clear
  B)
                  \[O_{2}^{2+}\] done clear
  C)
                  \[O_{2}^{2-}\]   done clear
  D)
                  \[O_{2}^{-}\] done clear
  View Solution play_arrow

• question_answer80)
  Which of the following species have maximum number of unpaired electrons                                    [AIIMS 1983]
  A)
                  \[{{O}_{2}}\]      done clear
  B)
                  \[O_{2}^{+}\] done clear
  C)
                  \[O_{2}^{-}\]     done clear
  D)
                  \[O_{2}^{2-}\] done clear
  View Solution play_arrow

• question_answer81)
  The correct order in which the O ? O bond length increases in the following is     [BHU 2000; CBSE PMT 2005]
  A)
                  \[{{H}_{2}}{{O}_{2}}<{{O}_{2}}<{{O}_{3}}\]          done clear
  B)
                  \[{{O}_{2}}<{{H}_{2}}{{O}_{2}}<{{O}_{3}}\] done clear
  C)
                  \[{{O}_{2}}<{{O}_{3}}<{{H}_{2}}{{O}_{2}}\]          done clear
  D)
                  \[{{O}_{3}}<{{H}_{2}}{{O}_{2}}<{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer82)
  Correct order of bond length is  [Orissa JEE 2005]
  A)
                  \[CO_{3}^{2-}>C{{O}_{2}}>CO\]                done clear
  B)
                  \[C{{O}_{2}}>CO>CO_{3}^{2-}\] done clear
  C)
                  \[CO>C{{O}_{2}}>CO_{3}^{2-}\]                done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer83)
  Which of the following is paramagnetic  [DPMT 2005]
  A)
                  \[{{N}_{2}}\]      done clear
  B)
                  \[{{C}_{2}}\] done clear
  C)
                  \[N_{2}^{+}\]    done clear
  D)
                  \[O_{2}^{2-}\] done clear
  View Solution play_arrow

• question_answer84)
  Among the following molecules which one have smallest bond angle      [Orissa JEE 2005]
  A)
                  \[N{{H}_{3}}\]   done clear
  B)
                  \[P{{H}_{3}}\] done clear
  C)
                  \[{{H}_{2}}O\]   done clear
  D)
                  \[{{H}_{2}}Sc\] done clear
  E)
                  \[{{H}_{2}}S\]                    done clear
  View Solution play_arrow