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JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Percentage composition and Molecular formula

  • question_answer
    The percentage of oxygen in \[NaOH\] is           [CPMT 1979]

    A)                 40          

    B)                 60

    C)                 8             

    D)                 10

    Correct Answer: A

    Solution :

               \[\because \]   40gm NaOH contains 16gm of oxygen                                 \[\therefore \]  100gm of NaOH contains \[\frac{16}{40}\times 100\]=40% oxygen.


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