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JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Self Evaluation Test - Some Basic Concepts of Chemistry

  • question_answer
    3.92 g of ferrous ammonium sulphate crystals are dissolved in 100 mL of water. 20 mL of this solution requires 18 mL of potassium permaganate during titration for complete oxidation. The weight of \[KMn{{O}_{4}}\] present in one litre of the solution of

    A) 3.47 g      

    B) 12.38 g

    C) 1.23 g                          

    D) 34.76 g

    Correct Answer: A

    Solution :

    [a] Normality of ferrous amm sulphate \[=\frac{3.92\times 1000}{392\times 100}=0.1\](Eq. wt of FAS is 392) \[{{M}_{1}}{{V}_{1}}={{M}_{2}}{{V}_{2}}\] \[20\times 0.1=18\times {{N}_{2}}\]     \[{{N}_{2}}=0.111\] 1 g ev. of \[KMn{{O}_{4}}=31.6g\] 0.111 g ev. of \[KMn{{O}_{4}}=31.6\times 0.111=3.5g.\]                        


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