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

  • question_answer
    Given that the abundance of isotopes \[^{54}Fe\], \[^{56}Fe\] and \[^{57}Fe\] is 5%, 90% and 5%, respectively. The atomic mass of Fe is

    A) 55.85   

    B) 55.95

    C) 55.75   

    D) 55.05

    Correct Answer: B

    Solution :

    The atomic mass of iron is \[=\frac{(5\times 54)+(90\times 56)+(5\times 57)}{100}=55.95\]


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