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  5. Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ

NEET Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ NEET PYQ-Some Basic Concepts Chemistry

  • question_answer
    An element, X has the following isotopic composition;                                                          [AIPMT (S) 2007] \[^{200}X:90%\] \[^{199}X:8.0%\] \[^{202}X:2.0%\] The weighted average atomic mass of the naturally-occurring element X is closest to:

    A)  200 amu

    B)        201 amu

    C)       202 amu

    D)   199 amu

    Correct Answer: D

    Solution :

    Weight of \[^{200}X=0.90\times 200=180.00\] amu
                Weight of \[^{199}X=0.08\times 199=15.92\] amu
                Weight of \[^{202}X=0.02\times 202=4.04\] amu
                Total weight \[=199.06~\times \,202\] amu


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