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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 24

  • question_answer
    The atomic weights of two elements A and B Sire 40 and 80 respectively. If x g of A contains y atoms, how many atoms are present in 2x g of B?

    A) \[\frac{y}{2}\]              

    B) \[\frac{y}{4}\]

    C) y                     

    D) 2y

    Correct Answer: C

    Solution :

    [c] : No. of moles of \[A=\frac{x}{40}\] No. of atoms of \[A=\frac{x}{40}\times {{N}_{A}}=y\] No. of moles of\[B=\frac{2x}{80}=\frac{x}{40}\] Now, no. of atoms of\[B=\frac{x}{40}\times {{N}_{A}},\]i.e., y


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