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NEET Sample Paper NEET Sample Test Paper-77

  • question_answer
    A compound obtained by burning of an element belongs to 2nd group and 3rd period when passes through red litmus paper it turns blue the equivalent weight of compound is

    A)  58                               

    B)  29                 

    C)  116                             

    D)  14.5

    Correct Answer: B

    Solution :

    Element belongs to 2nd group and 3rd period is Mg. Mg on burning in air given MgO whose aqueous solution is basic in nature due to formation of \[\operatorname{Mg}{{\left( OH \right)}_{2}}\]. Molecular mass of \[\operatorname{Mg}\,{{(OH)}_{2}}\,\,=\,\,24+17\times 2\] \[= 24 + 34 = 58\] Equivalent weight of \[\operatorname{Mg}{{\left( OH \right)}_{2}}=\frac{58}{2}=29\]


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