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JEE Main & Advanced Sample Paper JEE Main Sample Paper-39

  • question_answer
    3.92 g of ferrous ammonium sulphate react completely with\[50\,\,ml\,\,\frac{N}{10}KMn{{O}_{4}}\]solution. The percentage purity of the sample is

    A)  50                              

    B)  78.4

    C)  80                              

    D)  39.2

    Correct Answer: A

    Solution :

     Eq. of \[KMn{{O}_{4}}\] used\[=\frac{50\times 1}{1000\times 10}=0.005\] \[\therefore \]Eq of FAS reacted =0.005 \[\therefore \]weight of FAS needed =0.005 x 392 =1.96 g Thus, percentage purity of FAS is 50%


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