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

done Numerical Value Type Questions - The d- and f-Block Elements Total Questions - 15

• question_answer1)
  The colour of \[KMn{{O}_{4}}\] solution is decolourised by \[F{{e}^{2+}}\] solution, one mole of \[F{{e}^{2+}}\] reacts with x moles of \[KMn{{O}_{4}}\]. Find x.
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• question_answer2)
  Use Hund's rule to derive the electronic configuration of \[C{{e}^{3+}}\] ion, and calculate its magnetic moment on the basis of 'spin-only' formula.
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• question_answer3)
  A compound of a metal ion \[{{M}^{x+}}\,(Z=24)\] has a spin only magnetic moment of \[\sqrt{15}\] Bohr Magnetons. Find the number of unpaired electrons in the compound.
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• question_answer4)
  What are the number of ions formed on dissolving one molecule of \[FeS{{O}_{4}}\,\] \[{{(N{{H}_{4}})}_{2}}\] \[S{{O}_{4}}.6{{H}_{2}}O\] (Mohr's salt)?
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• question_answer5)
    In an alkaline condition \[KMn{{O}_{4}}\] reacts as follows: \[2KMn{{O}_{4}}+2KOH\to 2{{K}_{2}}Mn{{O}_{4}}+{{H}_{2}}O+O\] Calculate its equivalent weight.
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• question_answer6)
  Titanium shows magnetic moment of 1.73 B.M. in its compound. What is the oxidation number of Ti in the compound?
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• question_answer7)
  Four successive members of the first series of the transition metals are listed below. How many of them have the standard potential \[\left( E_{{{M}^{2+}}/M}^{{}^\circ } \right)\] value with positive sign? (I) Co (Z=27)              (II) Ni (Z=28) (III) Cu (Z=29)            (IV) Fe (Z=26)
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• question_answer8)
  What is the approximate percentage of iron in mischmetal?
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• question_answer9)
  The standard redox potentials for the reactions \[M{{n}^{2+}}+2{{e}^{-}}\to Mn\] and \[M{{n}^{3+}}+{{e}^{-}}\to M{{n}^{2+}}\] are\[~-\,1.18\text{ }V\] and 1.51 V respectively. What is the redox potential for the reaction \[M{{n}^{3+}}+3{{e}^{-}}~\to Mn\]?
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• question_answer10)
  \[CrO_{4}^{2-}\xrightarrow{pH=x}\,CrO_{7}^{2-}\,\xrightarrow{pH=y}CrO_{4}^{2-}\]. Find the sum of x and
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• question_answer11)
  12 grams of silver was extracted from a sample of an ore from which the only source of silver was \[A{{g}_{2}}S\]. How many grams of \[A{{g}_{2}}S\] were in the original sample?
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• question_answer12)
  What is the oxidation number of Mn in the product of alkaline oxidative fusion of \[Mn{{O}_{2}}.\]
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• question_answer13)
  Out of the following, how many oxides are acidic. \[MnO,\,M{{n}_{2}}{{O}_{3}},\,\,Mn{{O}_{2}},\,Mn{{O}_{3}},\,M{{n}_{2}}{{O}_{7}}\]
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• question_answer14)
  How many of the transition elements are called platinum metals?
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• question_answer15)
  A light blue coloured compound (A) on heating gives a black compound (B) which reacts with glucose to give a red compound (C). After the completion of reaction, how many metal oxides are formed?
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