JEE Main & Advanced Chemistry The d-and f-Block Elements Question Bank Critical Thinking

  • question_answer \[KMn{{O}_{4}}\] reacts with ferrous sulphate according to the equation \[MnO_{4}^{-}+5F{{e}^{2+}}+8{{H}^{+}}\to M{{n}^{2+}}+5F{{e}^{3+}}+4{{H}_{2}}O\] Here \[10ml\] of \[0.1M\] \[KMn{{O}_{4}}\] is equivalent to [CPMT 1999]

    A) \[20ml\] of \[0.1M\] \[FeS{{O}_{4}}\]

    B) \[30ml\] of \[0.1M\] \[FeS{{O}_{4}}\]

    C) \[40ml\] of \[0.1M\] \[FeS{{O}_{4}}\]

    D) \[50ml\] of \[0.1M\] \[FeS{{O}_{4}}\]

    Correct Answer: D

    Solution :

      In this reaction \[\underset{1}{\mathop{MnO_{4}^{-}}}\,+\underset{5}{\mathop{5F{{e}^{2+}}}}\,+8{{H}^{+}}\to M{{n}^{2+}}+5F{{e}^{3+}}+4{{H}_{2}}O\] 5 time quantity of \[F{{e}^{2+}}\] consumed. So 5 time of \[FeS{{O}_{4}}\] will be equivalent to 50 ml

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