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JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Critical Thinking

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    3.92 g of ferrous ammonium sulphate crystals are dissolved in 100 ml of water, 20 ml of this solution requires 18 ml of \[KMn{{O}_{4}}\] during titration for complete oxidation. The weight of \[KMn{{O}_{4}}\] present in one litre of the solution is [Tamilnadu  CET 2002]

    A)                 3.476 g  

    B)                 12.38 g

    C)                 34.76 g  

    D)                 1.238 g

    Correct Answer: A

    Solution :

               \[KMn{{O}_{4}}\]= Mohr salt                                 \[\frac{{{M}_{1}}{{V}_{1}}}{1}=\frac{{{M}_{2}}{{V}_{2}}}{5}=\left[ \frac{W}{M\times V}\times 1000 \right]\times \frac{{{V}_{2}}}{5}\] \[\left[ \frac{W\times 1000}{58\times 1000} \right]\times 18\] \[=\frac{3.92\times 1000}{392\times 1000}\times \frac{20}{5}\] W=3.476gm/L.


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