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

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

  • question_answer
    It is known that atoms have proton, neutron, electron and nucleus. If the mass of neutron assumed to be half of its original value whereas that of proton is assumed to be twice the original value, then the atomic mass of \[_{6}{{C}^{14}}\] will be

    A) 14.3% less than original value

    B) 14.3% greater than original value

    C) 28.6% less than original value

    D) 28.6% greater than original value

    Correct Answer: A

    Solution :

    [a] Idea: To solve this problem complete the all reaction then choose the correct option.
    Number of protons in \[_{6}{{C}^{14}}=6\]
    Number of neutrons in\[_{6}{{C}^{14}}=8\]
    New atomic mass of \[_{6}{{C}^{14}}=\frac{8}{2}\times 6\times 2\]
    \[=4+16=16\]
    % increase in mass \[=\frac{16-14}{14}\times 100=14.3%\]
    TEST Edge: In JEE Main these type of questions are asked frequently, so students are advised to go through broad and clear understanding of preparation of various hydrocarbon and their derivatives such as alkenes, alkyl halide, aldehyde amines etc.


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