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JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Topic Test - Some Basic Concepts of Chemistry

  • question_answer
    Three isotopes of an element have mass numbers M, (M + 1) and (M + 2). The mean atomic mass is (M + 0.5). Then which of the following ratio maybe accepted for M, (M + 1), (M + 2) respectively

    A) 1 : 1 : 1

    B) 4 : 1 : 1

    C) 3 : 2 : 1

    D) 2 : 1 : 1

    Correct Answer: B

    Solution :

    [b] Mean atomic mass
    \[=\frac{M\times 4+(M+1)\times 1+(M+2)\times 1}{6}\]
    \[=\frac{6M+3}{6}=M+0.5\]
    Thus the mass ratio will be 4 : 1 :1.


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