JEE Main & Advanced Chemistry The d-and f-Block Elements / d तथा f ब्लॉक के तत्व Question Bank

done Mock Test - d- and f- Block Elements Total Questions - 25

• question_answer1)
  Which has lowest and highest first ionization enthalpy in 3d series?
  A)
  Cu and Cr          done clear
  B)
  Cu and Se done clear
  C)
  Cu and Zn         done clear
  D)
  Sc and Zn done clear
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• question_answer2)
  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?
  A)
  Fe > Mn > Co > Cr done clear
  B)
  Cr > Mn > Co > Fe done clear
  C)
  Mn > Cr > Fe > Co done clear
  D)
  Co > Mn > Fe > Cr done clear
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• question_answer3)
  Which of the following is correct about basic strength of hydroxide?
  A)
  \[Sc{{(OH)}_{3}}>Y{{(OH)}_{3}}>La{{(OH)}_{3}}\] done clear
  B)
  \[La{{(OH)}_{3}}>Y{{(OH)}_{3}}>Sc{{(OH)}_{3}}\] done clear
  C)
  \[La{{(OH)}_{3}}>Y{{(OH)}_{3}}>Sc{{(OH)}_{3}}\] done clear
  D)
  \[Y{{(OH)}_{3}}>La{{(OH)}_{3}}>Sc{{(OH)}_{3}}\]   done clear
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• question_answer4)
  AgCl and NaCl are colourless NaBr and Nal are also colourless but AgBr and AgI are coloured. This is due to
  A)
  \[A{{g}^{+}}\] has half-filled d-orbital done clear
  B)
  \[A{{g}^{+}}\]polarises \[B{{r}^{-}}\] and \[{{I}^{-}}\] done clear
  C)
  \[A{{g}^{+}}\]depolarises \[B{{r}^{-}}\] and \[{{I}^{-}}\] done clear
  D)
  None is correct done clear
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• question_answer5)
  The basic character of the transition metal monoxides follows the order (Atomic number, Ti = 22, V = 23, Cr = 24, Fe = 26)
  A)
  TiO > VO > CrO > FeO done clear
  B)
  VO > CrO > TiO > FeO done clear
  C)
  TiO > FeO > VO > CrO done clear
  D)
  CrO > VO > FeO > TiO done clear
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• question_answer6)
  The radii (metallic) of Fe, Co and Ni are nearly same. This is due to
  A)
  lanthanide contraction done clear
  B)
  the fact that successive addition of d-electrons screen the outer electrons (4s) from the inward pull of the nucleus done clear
  C)
  increase in radii due to increase in 'n' is compensated by decrease in radii due to increase in effective nuclear charge (Z) done clear
  D)
  atomic radii do not remain constant but decrease in a normal gradation done clear
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• question_answer7)
  The melting point of Cu, Ag and Au follow the order
  A)
  Cu>Ag>Au       done clear
  B)
  Au>Ag>Cu done clear
  C)
  Cu>Au>Ag       done clear
  D)
  Ag>Au>Cu done clear
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• question_answer8)
  Compound that is both paramagnetic and coloured is
  A)
  \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]      done clear
  B)
  \[{{(N{{H}_{4}})}_{2}}[TiC{{l}_{6}}]\] done clear
  C)
  \[VOS{{O}_{4}}\]         done clear
  D)
  \[{{K}_{3}}[Cu{{(CN)}_{4}}]\] done clear
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• question_answer9)
  \[MnO_{4}^{-}\] is of intense pink colour, though Mn is in (+7) oxidation state. It is due to
  A)
  oxygen gives colour to it done clear
  B)
  charge transfer when Mn gives its electron to oxygen done clear
  C)
  charge transfer when oxygen gives its electron to mb making it Mn(+VI) hence coloured done clear
  D)
  none is correct done clear
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• question_answer10)
  \[C{{r}_{2}}Cr{{O}_{7}}^{2-}\xrightarrow{pH=X}Cr{{O}_{4}}^{2-}\xrightarrow{pH=Y}C{{r}_{2}}O_{4}^{2-}\] pH Value of X and Fare
  A)
  4 and 5 done clear
  B)
  4 and 8 done clear
  C)
  8 and 4 done clear
  D)
  8 and 9 done clear
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• question_answer11)
   A, B and C respectively are:
  A)
  \[{{K}_{2}}S{{O}_{4}}\],\[{{K}_{2}}Cr{{O}_{4}}\]and \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] done clear
  B)
  \[{{K}_{2}}S{{O}_{4}}\],\[N{{a}_{2}}Cr{{O}_{4}}\] and \[N{{a}_{2}}C{{r}_{2}}{{O}_{7}}\] done clear
  C)
  \[{{H}_{2}}S{{O}_{4}}\],\[NaCr{{O}_{2}}\] and \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] done clear
  D)
  \[{{H}_{2}}S{{O}_{4}}\],\[N{{a}_{2}}C{{r}_{2}}{{O}_{7}}\] and \[{{K}_{2}}C{{r}_{2}}{{0}_{7}}\] done clear
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• question_answer12)
    Pyrolusite in \[Mn{{O}_{2}}\] is used to prepare\[KMn{{O}_{4}}\]. Steps are \[Mn{{O}_{2}}\xrightarrow{I}Mn{{O}_{4}}^{2-}\xrightarrow{II}Mn{{O}_{4}}^{-}\] Here, I and II are
  A)
  fused with KOH/air, electrolytic oxidation done clear
  B)
  fuse with cone. HN03/air, electrolytic oxidation done clear
  C)
  fused with KOH/air, electrolytic reduction done clear
  D)
  All are correct done clear
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• question_answer13)
  Identify P and Q products in given reaction \[KI+Mn{{O}_{4}}^{-}\xrightarrow{{{H}^{-}}}P+M{{n}^{2+}}\] \[KI+Mn{{O}_{4}}^{-}\xrightarrow{O{{H}^{-}}}I{{O}_{3}}^{-}+Q\]
  A)
  \[I{{O}_{3}}^{-}\],\[Mn{{O}_{2}}\]respectively done clear
  B)
  \[{{I}_{2}}\],\[M{{n}^{2+}}\]respectively done clear
  C)
  \[I{{O}_{3}}^{-},M{{n}^{2+}}\]respectively done clear
  D)
  \[{{I}_{2}}\],\[Mn{{O}_{2}}\]respectively done clear
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• question_answer14)
  \[KMn{{O}_{4}}\] acts as an oxidizing agent in acidic medium. The number of moles of \[KMn{{O}_{4}}\] needed to react with one mole of sulphide ions in acidic solution is
  A)
  2/5                    done clear
  B)
  3/5 done clear
  C)
  1/5                    done clear
  D)
  4/5 done clear
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• question_answer15)
  \[FeC{{r}_{2}}{{O}_{4}}\] (chromite) is converted to Cr by following steps: Chromite \[\xrightarrow{I}N{{a}_{2}}Cr{{O}_{4}}\]\[\xrightarrow{II}C{{r}_{2}}{{O}_{3}}\xrightarrow{III}Cr,\,\] I, II and III are
  A)

  I	II	III
  \[N{{a}_{2}}C{{o}_{3}}/air,\Delta \]	C	C

  done clear
  B)

  I	II	III
  \[NaOH/air,\Delta \]	C,\[\Delta \]	Al,\[\Delta \]

  done clear
  C)

  I	II	III
  \[NaOH/air,\Delta \]	C,\[\Delta \]	Mg,\[\Delta \]

  done clear
  D)

  I	II	III
  cone. \[{{H}_{2}}S{{O}_{4}},\Delta \]	\[N{{H}_{4}}Cl\]	C,\[\Delta \]

  done clear
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• question_answer16)
  Across the lanthanide series, the basicity of the lanthanoid hydroxides
  A)
  increases done clear
  B)
  decreases done clear
  C)
  first increases and then decreases done clear
  D)
  does not change done clear
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• question_answer17)
  The main reason for larger number of oxidation state exhibited by the actinides than that corresponding lanthanides, is
  A)
  lesser energy difference between 5\[f\]and 6d orbitals than between 4\[f\]and 5d-orbitals done clear
  B)
  larger atomic size of actinides than the lanthanides done clear
  C)
  more energy difference between 5\[f\]and 6d orbitals than between 4\[f\]and 5d-orbitals done clear
  D)
  greater reactive nature of the actinides than the lanthanides. done clear
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• question_answer18)
  The X, Y and Z respectively are
  A)
  \[L{{n}_{2}}{{O}_{3}},{{H}_{2}},Ln{{(OH)}_{3}}+{{H}_{2}}\] done clear
  B)
  \[Ln{{(OH)}_{3}}+{{H}_{2}},L{{n}_{2}}{{O}_{3}},{{H}_{2}}\] done clear
  C)
  \[{{H}_{2}},L{{n}_{2}}{{O}_{3}},Ln{{(OH)}_{3}}+{{H}_{2}}\] done clear
  D)
  \[Ln{{(OH)}_{3}}+{{H}_{2}},LN{{O}_{3}},{{H}_{2}}\] done clear
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• question_answer19)
    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 colored fumes and droplets of metal appear on the cooler part of the test tube. The red solid is
  A)
  \[HgO\]  done clear
  B)
  \[P{{b}_{3}}{{O}_{4}}\] done clear
  C)
  \[{{(N{{H}_{4}})}_{2}}C{{r}_{2}}{{O}_{7}}\]            done clear
  D)
  \[Hg{{I}_{2}}\] done clear
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• question_answer20)
  Excess of KI reacts with \[CuS{{O}_{4}}\] solution and then \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] solution is added to it. Which of the statements is incorred for this reaction?
  A)
  Evolved \[{{I}_{2}}\] is reduced done clear
  B)
  \[C{{u}_{2}}{{I}_{2}}\] is formed done clear
  C)
  \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\]is oxidized done clear
  D)
  \[Cu{{I}_{2}}\]is formed done clear
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• question_answer21)
  Out of the following, how many of these have magnetic moment value \[2\sqrt{12}\] \[M{{n}^{2+}},M{{n}^{1+}},{{\operatorname{Re}}^{2+}},{{\operatorname{Re}}^{1+}},T{{e}^{1+}},Cr,W\]
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• question_answer22)
  Out of following how many oxides are amphoteric in nature. \[MnO,M{{n}_{2}}O,Mn{{O}_{2}},Mn{{O}_{4}},M{{n}_{2}}{{O}_{7}},M{{n}_{3}}{{O}_{4}}\]
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• question_answer23)
  Following steps are involved in manufacturing of potassium dichromate:    What is difference in the O.N. of Cr between X and Z?
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• question_answer24)
  \[KMn{{O}_{4}}\] oxidises thiosulphate to \[S{{O}_{4}}^{2-}\] as per reaction \[xMn{{O}_{4}}^{-}+3{{S}_{2}}{{O}_{3}}^{2-}+{{H}_{2}}O\to xMn{{O}_{2}}+6S{{O}_{4}}^{2-}+2O{{H}^{-}}\]Find the value of x in above reaction.
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• question_answer25)
  Number of good reducing agents among \[C{{e}^{4+}},E{{u}^{2+}},S{{m}^{2+}},Y{{b}^{2+}},T{{b}^{3+}},L{{a}^{3+}},C{{e}^{3+}},are\]
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