NEET Chemistry The d-and f-Block Elements / d तथा f ब्लॉक के तत्व Question Bank

done Self Evaluation Test - The d-and f-Block Elements Total Questions - 70

• question_answer1)
  Which of the following is not a condition for complex formation?
  A)
  Small atomic size done clear
  B)
  High nuclear charge done clear
  C)
  Variable oxidation states done clear
  D)
  Availability of vacant d orbitals done clear
  View Solution play_arrow

• question_answer2)
  Zn gives \[{{H}_{2}}\] gas with \[{{H}_{2}}S{{O}_{4}}\] and \[HCl\] but not with \[HN{{O}_{3}}\] because
  A)
  Zn acts as an oxidising agent when react with\[HN{{O}_{3}}\]. done clear
  B)
  \[HN{{O}_{3}}\] is weaker acid than \[{{H}_{2}}S{{O}_{4}}\] and\[HCl\]. done clear
  C)
  In electrochemical series Zn is above hydrogen. done clear
  D)
  \[NO_{3}^{-}\] ion is reduced in preference to hydroniumion. done clear
  View Solution play_arrow

• question_answer3)
  Which one of the following species is stable in aqueous solution?
  A)
  \[C{{r}^{2+}}\]                                   done clear
  B)
  \[MnO_{4}^{-}\] done clear
  C)
  \[MnO_{4}^{3-}\]                                 done clear
  D)
  \[C{{u}^{+}}\] done clear
  View Solution play_arrow

• question_answer4)
  Which of the following is not correct about transition metals?
  A)
  Their melting and boiling points are high done clear
  B)
  Their compounds are generally coloured done clear
  C)
  They can form ionic or covalent compounds done clear
  D)
  They do not exhibit variable valency done clear
  View Solution play_arrow

• question_answer5)
  Zinc and mercury do not show variable valency like d-block element because
  A)
  they are soft. done clear
  B)
  their d-shells are complete. done clear
  C)
  they have only two electrons in the outermost shell. done clear
  D)
  their d-shells are incomplete. done clear
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• question_answer6)
  Which one of the following is diamagnetic ion?
  A)
   \[C{{o}^{2+}}\]                     done clear
  B)
  \[C{{u}^{2+}}\] done clear
  C)
  \[M{{n}^{2+}}\]                     done clear
  D)
  \[S{{c}^{3+}}\] done clear
  View Solution play_arrow

• question_answer7)
  Which group contains coloured ions out of

  1. \[C{{u}^{2+}}\]   2. \[T{{i}^{4+}}\]    3. \[C{{o}^{2+}}\] 4. \[F{{e}^{2+}}\]

  A)
  1, 2, 3, 4          done clear
  B)
  1, 3, 4 done clear
  C)
  2, 3                   done clear
  D)
  1, 2 done clear
  View Solution play_arrow

• question_answer8)
  A compound of a metal ion \[{{M}^{x+}}(Z=24)\] has a spin only magnetic moment of \[\sqrt{15}\]  Bohr Magnetons. The number of unpaired electrons in the compound are
  A)
  2                                  done clear
  B)
  4    done clear
  C)
  5                                  done clear
  D)
  3 done clear
  View Solution play_arrow

• question_answer9)
  Cuprous ion is colourless while cupric ion is coloured because
  A)
  both have half-filled p-and d-orbitals. done clear
  B)
  cuprous ion has incomplete d-orbital and cupric ion has a complete d-orbital. done clear
  C)
  both have unpaired electrons in the d-orbitals. done clear
  D)
  cuprous ion has complete d-orbital and cupric ion has an incomplete d-orbital. done clear
  View Solution play_arrow

• question_answer10)
  Among the following, the compound that is both paramagnetic and coloured, is
  A)
  \[KMn{{O}_{4}}\]                     done clear
  B)
  \[Cu{{F}_{4}}\] done clear
  C)
  \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]                  done clear
  D)
  All are coloured done clear
  View Solution play_arrow

• question_answer11)
  Which of the following oxides of manganese is amphoteric?
  A)
  \[Mn{{O}_{2}}\]                       done clear
  B)
  \[M{{n}_{2}}{{O}_{3}}\] done clear
  C)
  \[M{{n}_{2}}{{O}_{7}}\]                     done clear
  D)
  \[MnO\] done clear
  View Solution play_arrow

• question_answer12)
  In the laboratory, manganese (II) salt is oxidised to permanganate ion in aqueous solution by
  A)
  hydrogen peroxide done clear
  B)
  cone. nitric acid done clear
  C)
  peroxy disulphate            done clear
  D)
  dichromate done clear
  View Solution play_arrow

• question_answer13)
  When Cu reacts with \[AgN{{O}_{3}}\] solution, the reaction takes place is
  A)
  oxidation of Cu              done clear
  B)
  reduction of Cu done clear
  C)
  oxidation of \[A{{g}^{+}}\]   done clear
  D)
  reduction of \[NO_{3}^{-}\] done clear
  View Solution play_arrow

• question_answer14)
  \[CuS{{O}_{4}}\] reacts with KCN solution and forms
  A)
  \[Cu\left( CN \right)\]                   done clear
  B)
  \[Cu{{\left( CN \right)}_{2}}\] done clear
  C)
  \[{{K}_{3}}[Cu{{\left( CN \right)}_{4}}]\]           done clear
  D)
  \[{{K}_{4}}[Cu{{(CN)}_{6}}]\] done clear
  View Solution play_arrow

• question_answer15)
  Which of the following compounds gives red precipitate with \[AgN{{O}_{3}}\]?
  A)
  KI                                 done clear
  B)
  \[{{K}_{2}}Cr{{O}_{4}}\] done clear
  C)
  \[NaBr\]            done clear
  D)
  \[NaN{{O}_{3}}\] done clear
  View Solution play_arrow

• question_answer16)
  When horn silver ore is dissolved in excess of sodium cyanide solution compound formed is
  A)
  \[AgCN\]            done clear
  B)
  \[Na\left[ Ag{{\left( CN \right)}_{2}} \right]\] done clear
  C)
  \[N{{a}_{2}}\left[ Ag{{\left( CN \right)}_{3}} \right]\]  done clear
  D)
  \[N{{a}_{4}}\left[ Ag{{\left( CN \right)}_{5}} \right]\] done clear
  View Solution play_arrow

• question_answer17)
  In the equation

  \[4M+8C{{N}^{-}}+2{{H}_{2}}O+{{O}_{2}}\to \] \[4{{[M{{\left( CN \right)}_{2}}]}^{-}}+4O{{H}^{-}}\]

  Identify the metalM. It is

  A)
  copper               done clear
  B)
  iron done clear
  C)
  gold                              done clear
  D)
  zinc done clear
  View Solution play_arrow

• question_answer18)
  Mercury is the only metal which is liquid at \[0{}^\circ C\]. This is due to its
  A)
  very high ionisation energy and weak metallic bond. done clear
  B)
  low ionisation potential. done clear
  C)
  high atomic weight. done clear
  D)
  high vapour pressure. done clear
  View Solution play_arrow

• question_answer19)
  If \[KMn{{O}_{4}}\] is reduced by oxalic acid in an acidic medium then oxidation number of Mn changes from
  A)
  4 to 2                            done clear
  B)
  6 to 4 done clear
  C)
  +7 to+2           done clear
  D)
  7 to 4 done clear
  View Solution play_arrow

• question_answer20)
  In the preparation of \[KMn{{O}_{4}}\] pyrolusite \[(Mn{{O}_{2}})\] is first converted to potassium manganite\[({{K}_{2}}Mn{{O}_{4}})\]. In this conversion, the oxidation state of manganese changes from
  A)
  +1 to +3         done clear
  B)
  +2 to +4 done clear
  C)
  +3 to +5         done clear
  D)
  +4 to +6 done clear
  View Solution play_arrow

• question_answer21)
  In an alkaline condition \[KMn{{O}_{4}}\] reacts as follows: \[2KMn{{O}_{4}}+2KOH\to 2{{K}_{2}}Mn{{O}_{4}}+{{H}_{2}}O+O\] Its equivalent weight is
  A)
  31.6                  done clear
  B)
  52.7   done clear
  C)
  49                     done clear
  D)
  158 done clear
  View Solution play_arrow

• question_answer22)
  In which of the following compounds manganese has oxidation number equal to that of iodine in\[KI{{O}_{4}}\]?
  A)
  Potassium manganite done clear
  B)
  Potassium permanganate done clear
  C)
  Manganous chloride done clear
  D)
  Manganese chloride done clear
  View Solution play_arrow

• question_answer23)
  The colour of \[CuC{{r}_{2}}{{O}_{7}}\] solution in water is green because
  A)
  \[C{{r}_{2}}O_{7}^{2-}\] ions are green. done clear
  B)
  \[C{{u}^{2+}}\] ions are green. done clear
  C)
  Both \[C{{r}_{2}}O_{7}^{2-}\] and \[C{{u}^{2+}}\] ions are green. done clear
  D)
  \[C{{u}^{2+}}\] ions are blue and  \[C{{r}_{2}}O_{7}^{2-}\]ions are yellow. done clear
  View Solution play_arrow

• question_answer24)
  The correct order of magnetic moments (spin only values in B.M.) among is (Atomic nos.: Mn = 25, Fe = 26, Co = 27)
  A)
  \[{{\left[ Fe{{\left( CN \right)}_{6}} \right]}^{4-}}>{{\left[ MnC{{l}_{4}} \right]}^{2}}^{-}>{{\left[ CoC{{l}_{4}} \right]}^{2-}}\] done clear
  B)
  \[{{[MnC{{l}_{4}}]}^{2-}}>{{[Fe{{(CN)}_{6}}]}^{4-}}>{{[CoC{{l}_{4}}]}^{2-}}\] done clear
  C)
  \[{{[MnC{{l}_{4}}]}^{2-}}>{{[Co{{(Cl)}_{4}}]}^{2-}}>{{[Fe{{(CN)}_{6}}]}^{4-}}\] done clear
  D)
  \[{{[Fe{{(CN)}_{6}}]}^{4-}}>{{[Co{{(Cl)}_{4}}]}^{2-}}>{{[MnC{{l}_{4}}]}^{2-}}\]  done clear
  View Solution play_arrow

• question_answer25)
  Out of \[{{[Ti{{F}_{6}}]}^{2-}},{{[Co{{F}_{6}}]}^{3-}},C{{u}_{2}}C{{l}_{2}}\] and \[{{[NiC{{l}_{4}}]}^{2-}}\]of (Z of Ti = 22, Co = 27, Cu = 29, Ni = 28), the colourless species are:
  A)
  \[C{{u}_{2}}C{{l}_{2}}\,\]and \[{{[NiC{{l}_{4}}]}^{2-}}\] done clear
  B)
  \[{{[Ti{{F}_{6}}]}^{2-}}\] and \[C{{u}_{2}}C{{l}_{2}}\,\] done clear
  C)
  \[{{[Co{{F}_{6}}]}^{3-}}\] and \[{{[NiC{{l}_{4}}]}^{2-}}\] done clear
  D)
  \[{{[Ti{{F}_{6}}]}^{2-}}\] and \[{{[Co{{F}_{6}}]}^{3-}}\] done clear
  View Solution play_arrow

• question_answer26)
  The basic character of the transition metal monoxides follows the order (Atomic Nos., Ti = 22, V = 23, Cr = 24, Fe = 26)
  A)
  \[TiO>VO>CrO>FeO\] done clear
  B)
  \[VO>CrO>TiO>FeO\] done clear
  C)
  \[CrO>VO>FeO>TiO\] done clear
  D)
  \[TiO>FeO>VO>CrO\] done clear
  View Solution play_arrow

• question_answer27)
  Which of the following statement is incorrect?
  A)
  Across a period from Sc to Cu the densities increase with increasing atomic number. done clear
  B)
  The melting point of transition elements rise to a maximum from Sc to Cr and then decreases from Fe to Zn. done clear
  C)
  Transition elements have high enthalpies of atomization and in 3d series increase regularly from Sc to Cu. done clear
  D)
  On going down a group from 3d to 6d series the stability of higher oxidation state increases with increasing atomic number. done clear
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• question_answer28)
  On the basis of data given below,

  Which of the following statements is incorrect?

  A)
  \[S{{c}^{3+}}\] has good stability due of \[\left[ Ar \right]3{{d}^{0}}4{{s}^{0}}\] configuration. done clear
  B)
  \[M{{n}^{3+}}\] is more stable than \[M{{n}^{2+}}\]. done clear
  C)
  \[C{{r}^{2+}}\] is reducing in nature. done clear
  D)
  Copper does not give \[{{H}_{2}}\] on reaction with dil. \[{{H}_{2}}S{{O}_{4}}\]. done clear
  View Solution play_arrow

• question_answer29)
  A compound of iron exists as a dimer in vapour state. It is hygroscopic in nature and dissolves in water giving brown acidic solution. The compound is
  A)
  \[F{{e}_{3}}{{O}_{4}}\]                      done clear
  B)
  \[FeS{{O}_{4}}\] done clear
  C)
  \[FeC{{l}_{3}}\]                        done clear
  D)
  \[Fe{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer30)
  A metal M and its compound can give the following observable changes in a consequence of reactions   
  A)
  Mg                                done clear
  B)
  Pb    done clear
  C)
  Zn                                 done clear
  D)
  Sn done clear
  View Solution play_arrow

• question_answer31)

  \[\left( X \right)+{{K}_{2}}C{{O}_{3}}+Air\xrightarrow{heat}\left( Y \right)\]

  \[\left( Y \right)+C{{l}_{2}}\xrightarrow{{}}\left( Z \right)Pink\]

  Which of the following is correct?

  A)
  \[X=black,\text{ }Mn{{O}_{2}},Y=Blue,\]  \[{{K}_{2}}Cr{{O}_{4}},Z=KMn{{O}_{4}}\] done clear
  B)
  \[X=green,\text{ }C{{r}_{2}}{{O}_{3}},Y=Yellow,\]  \[{{K}_{2}}Cr{{O}_{4}},\,\,Z={{K}_{2}}C{{r}_{2}}{{O}_{7}}\] done clear
  C)
  \[X=black,\text{ }Mn{{O}_{2}}\text{, }Y=green,\]  \[{{K}_{2}}Mn{{O}_{4}},Z=KMn{{O}_{4}}\] done clear
  D)
  \[X=black,B{{i}_{2}}{{O}_{3}},\,\,Y=colourless\]  \[KBi{{O}_{2}},Z=KBi{{O}_{3}}\] done clear
  View Solution play_arrow

• question_answer32)
  \[CuS{{O}_{4}}(aq.)\xrightarrow{{{H}_{2}}S\uparrow }M\downarrow \xrightarrow[of\,KCN]{Excess}N+O\] Then final products N and O are respectively.
  A)
  \[{{[Cu{{(CN)}_{4}}]}^{3-}},{{(CN)}_{2}}\] done clear
  B)
  \[CuCN,{{(CN)}_{2}}\] done clear
  C)
  \[{{[Cu{{(CN)}_{4}}]}^{2-}},{{(CN)}_{2}}\] done clear
  D)
  \[Cu{{\left( CN \right)}_{2}},{{K}_{2}}S\] done clear
  View Solution play_arrow

• question_answer33)
  Which of the following statements is false?
  A)
  \[N{{a}_{2}}C{{r}_{2}}{{O}_{7}}\] is less soluble than \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]. done clear
  B)
  \[N{{a}_{2}}C{{r}_{2}}{{O}_{7}}\] is primary standard in volumetry. done clear
  C)
  \[CrO{{_{4}^{2-}}^{~}}\] is tetrahedral in shape. done clear
  D)
  \[C{{r}_{2}}{{O}_{7}}^{2-}\] has a \[Cr-O-Cr\] bond. done clear
  View Solution play_arrow

• question_answer34)
  A red solid is insoluble in water. However it becomes soluble if some KI is added to water. Heating the red solid in a test tube results in liberation of some violet coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is
  A)
  \[Hg{{I}_{2}}\]                         done clear
  B)
  \[HgO\] done clear
  C)
  \[P{{b}_{3}}{{O}_{4}}\]                      done clear
  D)
  \[{{(N{{H}_{4}})}_{2}}C{{r}_{2}}{{O}_{7}}\] done clear
  View Solution play_arrow

• question_answer35)
  Of Cr (VI) as \[C{{r}_{2}}O{{_{7}^{2-}}^{~}}\] and \[CrO{{_{4}^{2-}}^{~}}\], which is better oxidising agent?
  A)
  \[Cr{{O}_{4}}^{2-}\], basic medium done clear
  B)
  \[C{{r}_{2}}{{O}_{7}}^{2-}\], basic medium done clear
  C)
  \[C{{r}_{2}}{{O}_{7}}^{2-}\], acidic medium done clear
  D)
  \[Cr{{O}_{3}}\] basic medium done clear
  View Solution play_arrow

• question_answer36)
  A blue colouration is not obtained when
  A)
  ammonium hydroxide dissolves in copper sulphate. done clear
  B)
  copper sulphate solution reacts with \[{{K}_{4}}\left[ Fe{{\left( CN \right)}_{6}} \right].\] done clear
  C)
  ferric chloride reacts with sod. ferrocyanide. done clear
  D)
  anhydrous \[CuS{{O}_{4}}\] is dissolved in water. done clear
  View Solution play_arrow

• question_answer37)
  Which of the statements is not true?
  A)
  On passing \[{{H}_{2}}S\] through acidified \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] solution, a milky colour is observed. done clear
  B)
  \[N{{a}_{2}}C{{r}_{2}}{{O}_{7}}\] is preferred over \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] in volumetric analysis. done clear
  C)
  \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]solution in acidic medium is orange. done clear
  D)
  \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]solution becomes yellow on increasing the pH beyond 7. done clear
  View Solution play_arrow

• question_answer38)
  The blue complex formed on addition of cone. \[N{{H}_{4}}OH\] solution to a \[C{{u}^{2+}}\] salt solution has the structure?
  A)
  \[{{[Cu{{(N{{H}_{4}})}_{4}}]}^{2+}}\]         done clear
  B)
  \[{{[Cu{{(N{{H}_{3}})}_{2}}]}^{2+}}\] done clear
  C)
  \[{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}\]         done clear
  D)
  \[{{[Cu{{(N{{H}_{4}})}_{2}}]}^{2+}}\] done clear
  View Solution play_arrow

• question_answer39)
  Identify the incorrect statement
  A)
  \[CuS{{O}_{4}}\] reacts with \[KCl\] in aqueous solution to give \[C{{u}_{2}}C{{l}_{2}}\]. done clear
  B)
  \[CuS{{O}_{4}}\]reacts with KI in aqueous solution to give \[C{{u}_{2}}{{I}_{2}}\]. done clear
  C)
  \[CuS{{O}_{4}}\] react with \[NaOH\] and glucose in aqueous medium to give \[C{{u}_{2}}O\]. done clear
  D)
  \[CuS{{O}_{4}}\] on strong heating gives CuO. done clear
  View Solution play_arrow

• question_answer40)
  The black compound formed during the reaction between sodium thiosulphate and silver nitrate is
  A)
  silver thiosulphate \[(A{{g}_{2}}{{S}_{2}}{{O}_{3}})\] done clear
  B)
  silver sulphide \[(A{{g}_{2}}{{S}_{2}})\] done clear
  C)
  silver sulphate \[(A{{g}_{2}}S{{O}_{4}})\] done clear
  D)
  silver sulphite \[(A{{g}_{2}}S{{O}_{3}})\] done clear
  View Solution play_arrow

• question_answer41)
  When \[KMn{{O}_{4}}\] is added to oxalic acid, the decolourisation is slow in the beginning but becomes instantaneous after sometime because
  A)
  \[M{{n}^{2+}}\] acts as autocatalyst. done clear
  B)
  \[C{{O}_{2}}\] is formed as the product. done clear
  C)
  Reaction is exothermic. done clear
  D)
  \[MnO_{4}^{-}\] catalyses the reaction. done clear
  View Solution play_arrow

• question_answer42)
  Number of electrons transfered in each case when \[KMn{{O}_{4}}\] acts as an oxidising agent to give \[Mn{{O}_{2}},M{{n}^{2+}},Mn{{(OH)}_{3}}\] and \[MnO_{4}^{2-}\] are respectively
  A)
  3, 5, 4 and 1        done clear
  B)
  4, 3, 1 and 5 done clear
  C)
  1, 3, 4 and 5        done clear
  D)
  5, 4, 3 and 1 done clear
  View Solution play_arrow

• question_answer43)
  Chloro compound of Vanadium has only spin magnetic moment of 1.73 BM. This Vanadium chloride has the formula: 
  A)
  \[VC{{l}_{2}}\]             done clear
  B)
  \[VC{{l}_{4}}\] done clear
  C)
  \[VC{{l}_{3}}\]             done clear
  D)
  \[VC{{l}_{5}}\] done clear
  View Solution play_arrow

• question_answer44)
  Which pair of elements with the given atomic numbers is expected to have similar properties?
  A)
  40, 72               done clear
  B)
  20, 36 done clear
  C)
  10, 28               done clear
  D)
  11, 12 done clear
  View Solution play_arrow

• question_answer45)
  When concentrated \[HCl\] is added to an aqueous solution of \[CoC{{l}_{2}}\] its colour changes from reddish pink to deep blue. Which complex ion gives blue colour in this reaction?
  A)
  \[{{[CoC{{l}_{4}}]}^{2-}}\]                 done clear
  B)
  \[{{[CoC{{l}_{6}}]}^{3-}}\] done clear
  C)
  \[{{[CoC{{l}_{6}}]}^{4-}}\]                 done clear
  D)
  \[{{[Co{{({{H}_{2}}O)}_{6}}]}^{2+}}\] done clear
  View Solution play_arrow

• question_answer46)
  Which of the following is not formed when \[{{H}_{2}}S\] reacts with acidic \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] solution?
  A)
  \[CrS{{O}_{4}}\]                      done clear
  B)
  \[C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\] done clear
  C)
  \[{{K}_{2}}S{{O}_{4}}\]                      done clear
  D)
  S done clear
  View Solution play_arrow

• question_answer47)
  Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of:
  A)
  \[Cr{{O}_{3}}\]                        done clear
  B)
  \[CrC{{l}_{3}}\] done clear
  C)
  \[Cr{{O}_{2}}C{{l}_{2}}\]                   done clear
  D)
  \[C{{r}_{2}}{{O}_{3}}\] done clear
  View Solution play_arrow

• question_answer48)
  When a small amount of \[KMn{{O}_{4}}\] is added to concentrated \[{{H}_{2}}S{{O}_{4}}\] a green oily compound is obtained which is highly explosive in nature. Compound may be:
  A)
  \[MnS{{O}_{4}}\]        done clear
  B)
  \[M{{n}_{2}}{{\text{O}}_{7}}\] done clear
  C)
  \[Mn{{O}_{2}}\]                       done clear
  D)
  \[M{{n}_{2}}{{\text{O}}_{3}}\] done clear
  View Solution play_arrow

• question_answer49)
  Identify incorrect statement:
  A)
  \[C{{u}_{2}}O\] is colourless. done clear
  B)
  Copper (I) compounds are colourless except when colour results from charge transfer. done clear
  C)
  Copper (I) compounds are diamagnetic. done clear
  D)
  \[C{{u}_{2}}S\] is black. done clear
  View Solution play_arrow

• question_answer50)
  Which of the following compounds has colour but no unpaired electrons?
  A)
  \[KMn{{O}_{4}}\]                     done clear
  B)
  \[{{K}_{2}}Mn{{O}_{4}}\] done clear
  C)
  \[MnS{{O}_{4}}\]                     done clear
  D)
  \[MnC{{l}_{2}}\] done clear
  View Solution play_arrow

• question_answer51)
  Which one of the following exhibits the large number of oxidation states?
  A)
  Ti (22)               done clear
  B)
  V (23) done clear
  C)
  Cr (24)              done clear
  D)
  Mn (25) done clear
  View Solution play_arrow

• question_answer52)
  The element with which of the following outer electron configuration may exhibit the largest number of oxidation states in its compounds:
  A)
  \[3{{d}^{5}}4{{s}^{2}}\]                   done clear
  B)
  \[3{{d}^{8}}4{{s}^{2}}\] done clear
  C)
  \[3{{d}^{7}}4{{s}^{2}}\]                   done clear
  D)
  \[3{{d}^{6}}4{{s}^{2}}\] done clear
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• question_answer53)
  Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers).
  A)
  \[Zr\left( 40 \right)\] and \[Nb\left( 41 \right)\] done clear
  B)
  \[Zr\left( 40 \right)\] and\[Hf\left( 72 \right)\] done clear
  C)
  \[Zr\left( 40 \right)\] and \[Ta\left( 73 \right)\]           done clear
  D)
  \[Ti\left( 22 \right)\] and \[Zr\left( 40 \right)\] done clear
  View Solution play_arrow

• question_answer54)
  Which is not the correct statement? (At. nos. Ce = 58, Lu = 71, La = 57, Yb= 70)
  A)
  Colour of \[Y{{b}^{3+}}\] ion is pink. done clear
  B)
  \[L{{a}^{3+}}\] is diamagnetic. done clear
  C)
  \[C{{e}^{4+}}\] has \[{{f}^{0}}\] configuration. done clear
  D)
  \[L{{a}^{3+}}\]had \[{{f}^{14}}\] configuration. done clear
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• question_answer55)
  Magnetic moment of \[G{{d}^{3+}}\] ion (Z = 64) is
  A)
  3.62 BM            done clear
  B)
  9.72 BM done clear
  C)
  7.9 BM              done clear
  D)
  10.60 BM done clear
  View Solution play_arrow

• question_answer56)
  Which of the following forms stable + 4 oxidation state?
  A)
  La (Z=57)         done clear
  B)
  Eu (Z=63) done clear
  C)
  Ce (Z=58)         done clear
  D)
  Gd (Z=64) done clear
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• question_answer57)
  The number of unpaired electrons in Gadolinium [Z=64] is
  A)
  3                                  done clear
  B)
  8     done clear
  C)
  6                                  done clear
  D)
  2 done clear
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• question_answer58)
  Which one of the following elements shows maximum number of different oxidation states in its compounds? 
  A)
  Eu                    done clear
  B)
  La    done clear
  C)
  Gd                                done clear
  D)
  Am done clear
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• question_answer59)
  The radius of \[L{{a}^{3+}}\] (Atomic number of La = 57) is \[1.06\overset{\text{o}}{\mathop{\text{A}}}\,\]. Which one of the following given values will be closest to the radius of \[L{{a}^{3+}}\] (Atomic number of Lu= 71)?
  A)
  \[1.40\overset{\text{o}}{\mathop{\text{A}}}\,\] done clear
  B)
  \[1.06\overset{\text{o}}{\mathop{\text{A}}}\,\] done clear
  C)
  \[0.85\overset{\text{o}}{\mathop{\text{A}}}\,\] done clear
  D)
  \[1.60\overset{\text{o}}{\mathop{\text{A}}}\,\] done clear
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• question_answer60)
  The electronic configuration of gadolinium (At. No. 64) is
  A)
  \[[Xe]4{{f}^{8}}5{{d}^{1}}6{{s}^{2}}\]       done clear
  B)
  \[[Xe]4{{f}^{7}}5{{d}^{1}}6{{s}^{2}}\] done clear
  C)
  \[[Xe]4{{f}^{3}}5{{d}^{5}}6{{s}^{2}}\]       done clear
  D)
  \[[Xe]4{{f}^{6}}5{{d}^{2}}6{{s}^{2}}\] done clear
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• question_answer61)
  In which of the following lanthanoids oxidation state +2 is most stable?
  A)
  Ce                    done clear
  B)
  Eu    done clear
  C)
  Tb                                done clear
  D)
  Dy done clear
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• question_answer62)
  Which of the following lanthanoid ions is diamagnetic? (At nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)
  A)
  \[S{{m}^{2+}}\]                     done clear
  B)
  \[E{{u}^{2+}}\] done clear
  C)
  \[Y{{b}^{2+}}\]                      done clear
  D)
  \[C{{e}^{2+}}\] done clear
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• question_answer63)
  Lanthanoid contraction can be observed in
  A)
  At                                 done clear
  B)
  Gd   done clear
  C)
  Ac                                done clear
  D)
  Lw done clear
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• question_answer64)
  Lanthanoides and actinoides resemble in
  A)
  Electronic configuration done clear
  B)
  Oxidation state done clear
  C)
  lonization energy done clear
  D)
  Formation of complexes done clear
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• question_answer65)
  The Ce (Z = 58) belongs to IIIrd group of periodic table. If it furnish one \[\alpha \] particle to form an element 'X', then X belongs to
  A)
  IIIrd group           done clear
  B)
  IInd group done clear
  C)
  Ist group             done clear
  D)
  zero group done clear
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• question_answer66)
  In aqueous solutions \[E{{u}^{2+}}\] acts as
  A)
  an oxidising agent. done clear
  B)
  a reducing agent. done clear
  C)
  can act either of these. done clear
  D)
  can act as redox agent. done clear
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• question_answer67)
  Arrange (I) \[C{{e}^{3+}}\], (II) \[L{{a}^{3+}}\], (III) \[P{{m}^{3+}}\], and (IV) \[Y{{b}^{3+}}\] in increasing order of their ionic radii.
  A)
  IV<III<I<II       done clear
  B)
  I<IV<III<II done clear
  C)
  IV<III<II<I       done clear
  D)
  III<II<I<IV done clear
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• question_answer68)
  Which of the following statement is not correct?
  A)
  \[La{{\left( OH \right)}_{3}}\] is less basic than \[Lu{{\left( OH \right)}_{3}}\]. done clear
  B)
  In lanthanide series ionic radius of \[L{{n}^{3+}}\] ions decreases. done clear
  C)
  La is actually an element of transition series rather than lanthanide series. done clear
  D)
  Atomic radii of Zr and Hf are same because of lanthanide contraction. done clear
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• question_answer69)
  The reason for the stability of \[G{{d}^{3+}}\] ion is
  A)
  4f subshell - half filled. done clear
  B)
  4f subshell - completely filled. done clear
  C)
  Possesses the general electronic configuration of noble gases. done clear
  D)
  4f-subshell empty. done clear
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• question_answer70)
  Knowing that the chemistry of lanthanoids(Ln) is dominated by its + 3 oxidation state, which of the following statements is incorrect?
  A)
  The ionic size of Ln (III) decrease in general with increasing atomic number. done clear
  B)
  Ln (III) compounds are generally colourless. done clear
  C)
  Ln (III) hydroxide are mainly basic in character. done clear
  D)
  Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character. done clear
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