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NEET Sample Paper NEET Sample Test Paper-70

  • question_answer
    A compound contains \[3.2%\] of oxygen. The minimum mol. wt. of the compound is

    A) 300                             

    B) 440       

    C) 350                             

    D) 500       

    Correct Answer: D

    Solution :

    The compound must contain at least one oxygen atom So, a minimum of 1 g atom of oxygen will be present in 1 g molecule, i.e., 1 mole of the compound. If Mis the mol. wt. of the compound, then since 16 is the atomic mass of oxygen so minimum of 16 g of oxygen will be present in M g of the compound Thus, \[%\] of oxygen \[=\,\,\frac{16}{M}\times 100\] or  \[3.2\,\,=\,\,\frac{16\times 100}{M}\] or   \[\operatorname{M}=500\]


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