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NEET Sample Paper NEET Sample Test Paper-79

  • question_answer
    13.4 g of a sample of unstable hydrated salt, \[N{{a}_{2}}S{{O}_{4}}\,\,X{{H}_{2}}O\] was found to contain 6.3 g of water. Determine the number of water of crystallisation

    A)  6                                

    B)  5

    C)  7                                

    D)  8

    Correct Answer: C

    Solution :

    \[\frac{Weight\,\,of\,\,water}{Weight\,\,of\,\,sample}\,\,=\] \[\frac{Weight\text{ }of\text{ }water\text{ }in\text{ }compound}{Molecular\,\,weight\,\,of\,\,compound}\] \[\frac{6.3}{13.4}\,\,=\,\,\frac{x\times 18}{142+18x}\,\,\] \[x=7\]


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