JEE Main & Advanced Sample Paper JEE Main Sample Paper-26

  • question_answer
    The particle A is converted into C via following reaction. \[A\to B{{+}_{2}}H{{e}^{4}}\] \[B\to C+2{{e}^{-}}\] Then,

    A)  A and C are isobars       

    B)  A and C are isotopes

    C)  A and B are isobars

    D)  A and B are isotopes

    Correct Answer: B

    Solution :

    Let x be the mass number of A and y be the atomic number. Since atomic number and mass number remain conserved, we have \[_{y}{{A}^{x}}{{\to }_{y-2}}{{B}^{x-4}}\,{{+}_{2}}H{{e}^{4}}\] \[_{y-2}{{B}^{x-4}}{{\to }_{y}}{{B}^{x-4}}\,+{{2}_{-1}}{{e}^{0}}\] Hence, we observe that A and C are isotopes as their atomic numbers are same but mass numbers are different.

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