Solved papers for NEET Chemistry NEET PYQ-The d-and f-Block Elements

done NEET PYQ-The d-and f-Block Elements Total Questions - 52

• question_answer1) Which one of the following elements shows maximum number of different oxidation states in its compounds? [AIPMT 1998]
  A)
  Eu
  done clear
  B)
  La
  done clear
  C)
  Gd
  done clear
  D)
  Am
  done clear
  View Answer play_arrow

• question_answer2) Which one of the following elements constitutes a major impurity in pig iron?        [AIPMT 1998]
  A)
  Silicon
  done clear
  B)
  Oxygen
  done clear
  C)
  Sulphur
  done clear
  D)
  Graphite
  done clear
  View Answer play_arrow

• question_answer3) Which one of the following pairs of substances on reaction will not evolve \[{{H}_{2}}\] gas?  [AIPMT 1998]
  A)
  Iron and \[{{H}_{2}}S{{O}_{4}}\] (aqueous)     
  done clear
  B)
  Iron and steam
  done clear
  C)
  Copper and \[HCl\] (aqueous)                  
  done clear
  D)
  Sodium and ethyl alcohol
  done clear
  View Answer play_arrow

• question_answer4) Which one of the following ionic species will impart colour to an aqueous solution? [AIPMT 1998]
  A)
  \[T{{i}^{4+}}\]
  done clear
  B)
  \[C{{u}^{+}}\]
  done clear
  C)
  \[Z{{n}^{2+}}\]
  done clear
  D)
  \[C{{r}^{3+}}\]
  done clear
  View Answer play_arrow

• question_answer5) 

  Which one of the following forms a colourless solution in aqueous medium?     [AIPMT 2000]

  (Atomic number  :\[Sc=21,\text{ }Ti=22,\text{ }V=23,\text{ }Cr=24\])

  A)
  \[{{V}^{3+}}\]
  done clear
  B)
  \[C{{r}^{3+}}\]
  done clear
  C)
  \[T{{i}^{3+}}\]
  done clear
  D)
  \[S{{c}^{3+}}\]
  done clear
  View Answer play_arrow

• question_answer6) Of the following transition metals, the maximum numbers of oxidation states are exhibited by: [AIPMT 2000]
  A)
  chromium \[(Z=24)\]
  done clear
  B)
  manganese \[(Z=25)\]
  done clear
  C)
  iron \[(Z=26)\]   
  done clear
  D)
  titanium \[(Z=22)\]
  done clear
  View Answer play_arrow

• question_answer7) Which of the following statements is net correct? [AIPMT 2001]
  A)
  \[La{{(OH)}_{3}}\] is less basic than \[Li{{(OH)}_{3}}\]
  done clear
  B)
  In lanthanide series ionic radius of \[L{{n}^{3+}}\] ion decreases
  done clear
  C)
  La is actually an element of transition series rather lanthanide
  done clear
  D)
  Atomic radius of Zn and Hf are same because of lanthanide contraction
  done clear
  View Answer play_arrow

• question_answer8) Which of the following statement is true?    [AIPMT 2002]
  A)
  Silicon exhibits 4 coordination number in its compounds                            
  done clear
  B)
  Bond energy of \[{{F}_{2}}\] is less than \[C{{l}_{2}}\]
  done clear
  C)
  Mn(III) oxidation state is more stable than Mn(Il) in aqueous state
  done clear
  D)
  Elements of 15th group shows only + 3 and +5 oxidation states
  done clear
  View Answer play_arrow

• question_answer9) Which of the following shows maximum number of oxidation states?                        [AIPMT 2002]
  A)
  Cr
  done clear
  B)
  Fe
  done clear
  C)
  Mn
  done clear
  D)
  V
  done clear
  View Answer play_arrow

• question_answer10) Zn gives \[{{H}_{2}}\] gas with \[{{H}_{2}}S{{O}_{4}}\] and \[HCl\] but not with \[HN{{O}_{3}}\]                                          [AIPMT 2002]
  A)
  Zn act as oxidising agent when react with \[HN{{O}_{3}}\] 
  done clear
  B)
  \[HN{{O}_{3}}\] is weaker acid then \[{{H}_{2}}S{{O}_{4}}\] and \[HCl\]
  done clear
  C)
  In electrochemical series Zn is above hydrogen
  done clear
  D)
  \[NO_{3}^{-}\] is reduced in preference to hydronium ion
  done clear
  View Answer play_arrow

• question_answer11) The basic character of the transition metal monoxides follows the order:         [AIPMT 2003]
  A)
  \[TiO>FeO>VO>CrO\]
  done clear
  B)
  \[TiO>VO>CrO>FeO\]
  done clear
  C)
  \[VO>CrO>TiO>FeO\]
  done clear
  D)
  \[CrO>VO>FeO>TiO\]
  done clear
  View Answer play_arrow

• question_answer12) The correct order of ionic radii of \[{{Y}^{3+}},\text{ }L{{a}^{3+}},\text{ }E{{u}^{3+}}\] and \[L{{u}^{3+}}\] is:     [AIPMT 2003]
  A)
  \[L{{u}^{3+}}<E{{u}^{3+}}<L{{a}^{3+}}<{{Y}^{3+}}\]                          
  done clear
  B)
  \[L{{a}^{3+}}<E{{u}^{3+}}<L{{u}^{3+}}<{{Y}^{3+}}\]
  done clear
  C)
  \[{{Y}^{3+}}<L{{a}^{3+}}<E{{u}^{3+}}<L{{u}^{3+}}\]                          
  done clear
  D)
  \[{{Y}^{3+}}<L{{u}^{3+}}<E{{u}^{3+}}<L{{a}^{3+}}\]
  done clear
  View Answer play_arrow

• question_answer13) Which one of the following characteristics of the transition metals is associated with their catalytic activity? [AIPMT 2003]
  A)
  Colour of hydrated ions              
  done clear
  B)
  Variable oxidation states
  done clear
  C)
  High enthalpy of atomization                   
  done clear
  D)
  Paramagnetic behavior
  done clear
  View Answer play_arrow

• question_answer14) Among K, Ca, Fe and Zn, the element which can form more than one binary compound with chlorine is: [AIPMT (S) 2004]
  A)
  Fe
  done clear
  B)
  Zn
  done clear
  C)
  K
  done clear
  D)
  Ca
  done clear
  View Answer play_arrow

• question_answer15) Among the following series of transition metal ions, the one in which all metal ions have \[3{{d}^{2}}\]electronic configuration is: (At. no. :\[Ti=22;\]\[V=23;\]\[Cr=24;Mn=25\]) [AIPMT (S) 2004]
  A)
  \[T{{i}^{3+}},{{V}^{2+}},C{{r}^{3+}},\,\,M{{n}^{4+}}\]          
  done clear
  B)
  \[T{{i}^{+}},{{V}^{4+}},C{{r}^{6}},\,\,M{{n}^{7+}}\]
  done clear
  C)
  \[T{{i}^{4+}},{{V}^{3+}},C{{r}^{2+}},\,\,M{{n}^{3+}}\]                      
  done clear
  D)
  \[T{{i}^{2+}},{{V}^{3+}},C{{r}^{4+}},\,\,M{{n}^{5+}}\]
  done clear
  View Answer play_arrow

• question_answer16) Lanthanides are:                 [AIPMT (S) 2004]
  A)
  14 elements in the sixth period (atomic no. = 90 to 103) that are filling 4f sub-level
  done clear
  B)
  14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f sub-level
  done clear
  C)
  14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4f sub-level
  done clear
  D)
  14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sub-level
  done clear
  View Answer play_arrow

• question_answer17) The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is:       [AIPMT (S) 2005]
  A)
  one fifth
  done clear
  B)
  five
  done clear
  C)
  one
  done clear
  D)
  two
  done clear
  View Answer play_arrow

• question_answer18) 

  The aqueous solution containing which one of the following ions will be colourless?  [AIPMT (S) 2005]

  (Atomic no. : Sc = 21, Fe = 26, Ti = 22, Mn = 25)

  A)
  \[S{{c}^{3+}}\]
  done clear
  B)
  \[F{{e}^{2+}}\]
  done clear
  C)
       \[T{{i}^{3+}}\]
  done clear
  D)
  \[M{{n}^{2+}}\]
  done clear
  View Answer play_arrow

• question_answer19) Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionization enthalpy?                                     [AIPMT (S) 2005]
  A)
  Vanadium (Z = 23)        
  done clear
  B)
  Chromium (Z = 24)
  done clear
  C)
  Iron (2 = 26)
  done clear
  D)
  Manganese (Z = 25)
  done clear
  View Answer play_arrow

• question_answer20) The main reason for larger number of oxidation states exhibited by the actinides than the corresponding lanthanides, is: [AIPMT (S) 2005]
  A)
  lesser energy difference between 5 f  and 6d orbitals than between 4f and 5d orbitals
  done clear
  B)
  larger atomic size of actinides than the lanthanides
  done clear
  C)
   more energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
  done clear
  D)
  greater reactive nature of the actinides than the lanthanides
  done clear
  View Answer play_arrow

• question_answer21) More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is:                          [AIPMT (S) 2006]
  A)
  more energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
  done clear
  B)
  lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
  done clear
  C)
  greater metallic character of the lanthanoids than that of the corresponding actinoids
  done clear
  D)
  more active nature of the actinoids
  done clear
  View Answer play_arrow

• question_answer22) 

  In which of the following pairs are both the ions coloured in aqueous solution? [AIPMT (S) 2006]

  (At. no.: Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

  A)
  Ni2+, Ti3+
  done clear
  B)
  Sc3+, Ti3+                    
  done clear
  C)
  Sc3 , Co2+
  done clear
  D)
  Ni2+, Cu+
  done clear
  View Answer play_arrow

• question_answer23) The number of moles of KMnO4 that will be needed to react with one mole of sulphite ion in acidic solution is:        [AIPMT (S) 2007]
  A)
  \[\frac{3}{5}\]
  done clear
  B)
  \[\frac{4}{5}\]
  done clear
  C)
  \[\frac{2}{5}\]
  done clear
  D)
  1
  done clear
  View Answer play_arrow

• question_answer24) Identify the incorrect statement among the following:                            [AIPMT (S) 2007]
  A)
  There is a decrease in the radii of die atoms or ions as one proceeds from La to Lu.
  done clear
  B)
  Lanthanoid contraction is the accumulation of successive shrinkages
  done clear
  C)
  As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with die 5d series of elements
  done clear
  D)
  Shielding power of 4f electrons is quite weak..
  done clear
  View Answer play_arrow

• question_answer25) 

  Which one of the following ions is the most stable in aqueous solution?              [AIPMT (S) 2007]

  (At. no. Ti = 22, V - 23, Cr = 24, Mn = 25)

  A)
  Cr3+
  done clear
  B)
  V3+             
  done clear
  C)
  Ti3+ 
  done clear
  D)
  Mn3+
  done clear
  View Answer play_arrow

• question_answer26) The correct order of decreasing second ionisation enthalpy of Ti (22), V (23), Cr (24) and Mn(25) is [AIPMT (S) 2008]
  A)
  \[Cr>Mn>V>Ti\]
  done clear
  B)
  \[V>Mn>Cr>Ti\]
  done clear
  C)
  \[Mn>Cr>Ti>V\]
  done clear
  D)
  \[Ti>V>Cr>Mn\]
  done clear
  View Answer play_arrow

• question_answer27) Number of moles of \[MnO_{4}^{-}\] required to oxidize one mole of ferrous oxalate completely in acidic medium will be                       [AIPMT (S) 2008]
  A)
  0. 6 mole
  done clear
  B)
  0.4 mole
  done clear
  C)
  7.5 moles
  done clear
  D)
  0.2 mole
  done clear
  View Answer play_arrow

• question_answer28) Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states? [AIPMT (S) 2009]
  A)
  3d3, 4s2
  done clear
  B)
  3d5, 4s1
  done clear
  C)
  3d5, 4s2
  done clear
  D)
  3d2, 4s2
  done clear
  View Answer play_arrow

• question_answer29) The ionisation constant of ammonium hydroxide is \[4\times {{10}^{-8}}m.\] at 298 K. Hydrolysis constant of ammonium chloride is               [AIPMT (S) 2009]
  A)
  \[V{{m}^{-1}}\]
  done clear
  B)
  \[8\times {{10}^{7}}\]
  done clear
  C)
  \[5\times {{10}^{-11}}\]
  done clear
  D)
  \[8\times {{10}^{-11}}\]
  done clear
  View Answer play_arrow

• question_answer30) Out of \[TiF_{6}^{2-},\,CoF_{6}^{3-},\,CuC{{l}_{2}}\] and \[NiCl_{4}^{2-}\] (Z of \[=k[A]{{[B]}^{2}}\]) the colourless species are             [AIPMT (S) 2009]
  A)
  \[=k{{[A]}^{2}}{{[B]}^{2}}\]and \[=k[A][B]\]
  done clear
  B)
  \[N_{2}^{-}<{{N}_{2}}<N_{2}^{2-}\] and \[N_{2}^{2-}<N_{2}^{-}<{{N}_{2}}\]
  done clear
  C)
  \[{{N}_{2}}<N_{2}^{2-}<N_{2}^{-}\]and\[N_{2}^{-}<N_{2}^{2-}<{{N}_{2}}\]
  done clear
  D)
  \[{{C}_{2}},{{C}_{3}},{{C}_{5}}\] and \[{{C}_{6}}\]
  done clear
  View Answer play_arrow

• question_answer31) Which of the following ions will: exhibit colour in aqueous solutions?               [AIPMT (S) 2010]
  A)
  \[L{{a}^{3+}}(Z=57)\]
  done clear
  B)
  \[T{{i}^{3+}}(Z=22)\]
  done clear
  C)
  \[L{{u}^{3+}}(Z=71)\]
  done clear
  D)
  \[S{{c}^{3+}}(Z=21)\]
  done clear
  View Answer play_arrow

• question_answer32) Which of the following oxidation states is the most common among the lanthanides? [AIPMT (M) 2010]
  A)
  4
  done clear
  B)
  2
  done clear
  C)
  5
  done clear
  D)
  3
  done clear
  View Answer play_arrow

• question_answer33) 

  For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order? [AIPMT (S) 2011]

  (At. no. Cr = 24, Mn = 25, Fe = 26, Co = 27)

  A)
  Fe > Mn > Co > Cr
  done clear
  B)
  Co > Mn > Fe > Cr
  done clear
  C)
  Cr > Mn > Co > Fe
  done clear
  D)
  Mn > Fe > Cr > Co
  done clear
  View Answer play_arrow

• question_answer34) Acidified \[{{\text{K}}_{\text{2}}}\text{C}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{7}}}\] solution turns green when \[\text{N}{{\text{a}}_{\text{2}}}\text{S}{{\text{O}}_{\text{3}}}\]is added to it. This is due to the formation of [AIPMT (S) 2011]
  A)
  \[\text{CrO}_{4}^{2-}\]
  done clear
  B)
  \[\text{C}{{\text{r}}_{\text{2}}}{{\text{(S}{{\text{O}}_{\text{3}}}\text{)}}_{\text{3}}}\]
  done clear
  C)
  \[\text{CrS}{{\text{O}}_{4}}\]
  done clear
  D)
  \[\text{C}{{\text{r}}_{\text{2}}}{{\text{(S}{{\text{O}}_{4}})}_{3}}\]
  done clear
  View Answer play_arrow

• question_answer35) In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with             [AIPMT (S) 2012]
  A)
  copper (I) sulphide (\[\text{C}{{\text{u}}_{\text{2}}}\text{S}\])
  done clear
  B)
  sulphur dioxide (\[\text{C}{{\text{O}}_{\text{2}}}\])
  done clear
  C)
  iron sulphide (FeS)
  done clear
  D)
  carbon monoxide (CO)
  done clear
  View Answer play_arrow

• question_answer36) Which of the statements is not true?                                                 [AIPMT (S) 2012]
  A)
  On passing \[{{\text{H}}_{\text{2}}}\text{S}\] through acidified \[{{\text{k}}_{\text{2}}}\text{C}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{7}}}\] solution, a milky colour is observed
  done clear
  B)
  \[\text{N}{{\text{a}}_{\text{2}}}\text{C}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{7}}}\]is preferred over \[{{\text{K}}_{\text{2}}}\text{C}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{7}}}\] in volumetric analysis
  done clear
  C)
  \[{{\text{K}}_{\text{2}}}\text{C}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{7}}}\] solution in acidic medium is orange
  done clear
  D)
  \[{{\text{K}}_{\text{2}}}\text{C}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{7}}}\] solution becomes yellow on increasing the pH beyond 7
  done clear
  View Answer play_arrow

• question_answer37) Which one of the following does not correctly represent the correct order of the property indicated against it?           [AIPMT (M) 2012]
  A)
  \[Ti<V<Cr<Mn\]: increasing number of oxidation states
  done clear
  B)
  \[T{{i}^{3+}}<{{V}^{3+}}<C{{r}^{3+}}<M{{n}^{3+}}\]: increasing magnetic moment
  done clear
  C)
  \[Ti<V<Cr<Mn\]: increasing melting points
  done clear
  D)
  \[Ti<V<Mn<Cr\]: increasing second ionisation enthalpy
  done clear
  View Answer play_arrow

• question_answer38) Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential \[({{E}^{o}}_{{{M}^{2+}}/M})\]positive sign?                            [AIPMT (M) 2012]
  A)
  Co (Z = 27)
  done clear
  B)
  Ni (Z = 28)
  done clear
  C)
  Cu (Z = 29)
  done clear
  D)
  Fe (Z = 26)
  done clear
  View Answer play_arrow

• question_answer39) The catalytic activity of transition metals and their compounds is ascribed mainly to [AIPMT (M) 2012]
  A)
  their magnetic behavior
  done clear
  B)
  their unfilled d-orbitals
  done clear
  C)
  their ability to adopt variable oxidation states
  done clear
  D)
  their chemical reactivity
  done clear
  View Answer play_arrow

• question_answer40) Which of the following exhibits only +3 oxidation state?                                  [AIPMT (M) 2012]
  A)
  U
  done clear
  B)
  Th
  done clear
  C)
  Ac
  done clear
  D)
  Pa
  done clear
  View Answer play_arrow

• question_answer41) 

  \[\text{KMn}{{\text{O}}_{\text{4}}}\] can be prepared from \[{{\text{K}}_{\text{2}}}\text{Mn}{{\text{O}}_{\text{4}}}\] as per reaction\[\text{3MnO}_{4}^{2-}+2{{H}_{2}}O2MnO_{4}^{-}\]\[+Mn{{O}_{2}}+4O{{H}^{-}}\][NEET 2013]

  The reaction can go to completion by removing \[\text{O}{{\text{H}}^{\text{-}}}\] ions by adding

  A)
  HCI     
  done clear
  B)
  KOH
  done clear
  C)
  \[C{{O}_{2}}\]
  done clear
  D)
  \[S{{O}_{2}}\]
  done clear
  View Answer play_arrow

• question_answer42) The reaction of aqueous \[KMn{{O}_{4}}\] with \[{{H}_{2}}{{O}_{2}}\] in acidic conditions gives             [AIPMT 2014]
  A)
  \[M{{n}^{4+}}\]and \[{{O}_{2}}\]
  done clear
  B)
  \[M{{n}^{2+}}\] and \[{{O}_{2}}\]
  done clear
  C)
  \[M{{n}^{2+}}\]and \[{{O}_{3}}\] 
  done clear
  D)
  \[M{{n}^{4+}}\]and \[Mn{{O}_{2}}\]
  done clear
  View Answer play_arrow

• question_answer43) Reason of lanthanoid contraction is [AIPMT 2014]
  A)
  negligible screening effect of T orbitals
  done clear
  B)
  increasing nuclear charge
  done clear
  C)
  decreasing nuclear charge
  done clear
  D)
  decreasing screening effect
  done clear
  View Answer play_arrow

• question_answer44) Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers).        [NEET 2015 ]
  A)
  \[Ti(22)and\,Zr(40)\]
  done clear
  B)
  \[Zr(40)and\,Nb(41)\]
  done clear
  C)
  \[Zr(40)and\,Hf\,(72)\]
  done clear
  D)
  \[Zr(40)and\,Ta(73)\]
  done clear
  View Answer play_arrow

• question_answer45) Assuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified \[KMn{{O}_{4}}\] for complete oxidation?                           [NEET 2015 (Re)]
  A)
  \[FeS{{O}_{4}}\]
  done clear
  B)
  \[FeS{{O}_{3}}\]
  done clear
  C)
  \[Fe{{C}_{2}}{{O}_{4}}\]
  done clear
  D)
  \[Fe{{(N{{O}_{2}})}_{2}}\]
  done clear
  View Answer play_arrow

• question_answer46) Which one of the following statements is correct when \[\text{S}{{\text{O}}_{\text{2}}}\]is passed through acidified \[{{\text{K}}_{2}}C{{r}_{2}}{{O}_{7}}\]solution?                              [NEET - 2016]
  A)
  The solution turns blue
  done clear
  B)
  The solution is decolourized
  done clear
  C)
  \[\text{S}{{\text{O}}_{\text{2}}}\]is reduced
  done clear
  D)
  Green \[C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\]is formed
  done clear
  View Answer play_arrow

• question_answer47) Which copper is heated with conc. \[\text{HN}{{\text{O}}_{\text{3}}}\]it produces                        [NEET - 2016]
  A)
  \[\text{Cu}{{\left( \text{N}{{\text{O}}_{\text{3}}} \right)}_{\text{2}}}\]and \[\text{N}{{\text{O}}_{\text{2}}}\]
  done clear
  B)
  \[\text{Cu}{{\left( \text{N}{{\text{O}}_{\text{3}}} \right)}_{\text{2}}}\] and NO
  done clear
  C)
  \[\text{Cu}{{\left( \text{N}{{\text{O}}_{\text{3}}} \right)}_{\text{2}}},\]NO and \[\text{N}{{\text{O}}_{\text{2}}}\]
  done clear
  D)
  \[\text{Cu}{{\left( \text{N}{{\text{O}}_{\text{3}}} \right)}_{\text{2}}}\]and \[\text{N}{{\text{O}}_{\text{2}}}\]
  done clear
  View Answer play_arrow

• question_answer48) Name the gas that can readily decolourises acidified\[KMn{{O}_{4}}\]solution:          [NEET-2017]
  A)
  \[{{P}_{2}}{{O}_{5}}\]
  done clear
  B)
  \[C{{O}_{2}}\]
  done clear
  C)
  \[S{{O}_{2}}\] 
  done clear
  D)
  \[N{{O}_{2}}\]
  done clear
  View Answer play_arrow

• question_answer49) The reason for greater range of oxidation states in actinoids is attributed to                  [NEET-2017]
  A)
  4f and 5d levels being close in energies
  done clear
  B)
  The radioactive nature of actinoids
  done clear
  C)
  Actinoid contraction
  done clear
  D)
  5f, 6d and 7s levels having comparable energies
  done clear
  View Answer play_arrow

• question_answer50) Which one of the following ions exhibits d-d transition and paramagnetism as well? [NEET - 2018]
  A)
  \[\text{MnO}_{\text{4}}^{\text{-}}\]
  done clear
  B)
  \[\text{C}{{\text{r}}_{\text{2}}}\text{O}_{\text{7}}^{\text{2-}}\]
  done clear
  C)
  \[\text{CrO}_{4}^{\text{2-}}\]
  done clear
  D)
  \[\text{MnO}_{\text{4}}^{\text{2-}}\]
  done clear
  View Answer play_arrow

• question_answer51) The manganate and permanganate ions are tetrahedral due to-                      [NEET 2019]
  A)
  The \[\pi \]-bonding involves overlap of p-orbitals of oxygen with p-orbtials of manganese
  done clear
  B)
  The \[\pi \]-bonding involves overlap of d-orbitals of oxygen with d-orbitals of manganese
  done clear
  C)
  The \[\pi \]-bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese
  done clear
  D)
  There is no \[\pi \]-bonding
  done clear
  View Answer play_arrow

• question_answer52) Identify the incorrect statement.    [NEET 2020]
  A)
  The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.
  done clear
  B)
  Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.
  done clear
  C)
  The oxidation states of chromium in \[CrO_{4}^{2-}\] and \[C{{r}_{2}}O_{4}^{2-}\] are not the same.
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  D)
  \[C{{r}^{2+}}({{d}^{4}})\] is a stronger reducing agent than \[F{{e}^{2+}}({{d}^{6}})\] in water.
  done clear
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