KVPY Sample Paper KVPY Stream-SX Model Paper-5

  • question_answer
    In order to oxidise a mixture of one mole of each of \[Fe{{C}_{2}}{{O}_{4}},\] \[F{{e}_{2}}({{C}_{2}}{{O}_{4}})3,\] \[FeS{{O}_{4}}\] and \[F{{e}_{2}}{{(S{{O}_{4}})}_{3}}\] in acidic medium, the number of moles of \[KMn{{O}_{4}}\]required is :

    A) 2                     

    B) 1

    C) 1.5                               

    D) 3

    Correct Answer: A

    Solution :

    \[{{F}_{e}}{{C}_{2}}{{O}_{4}}\to F{{e}^{+3}}+C{{O}_{2}}\]
    \[F{{e}_{2}}{{({{C}_{2}}{{O}_{4}})}_{3}}\to C{{O}_{2}}\]
    \[F{{e}_{2}}{{(S{{O}_{4}})}_{3}}\to \,No\,oxidation\]
    \[FeS{{O}_{4}}\to F{{e}^{+3}}\]
    \[moles\,\times \,V.F=moles\times V.F.+moles\times V.F.+moles\times V.F.\]
    \[x\times 5=(1\times 3)+(1\times 6)+(1\times 1)\]
    \[5x=10\,(MnO_{4}^{-}\to M{{n}^{+2}})\]

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