JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry Question Bank Atomic Molecular and Equivalent masses

  • question_answer Which of the following has least mass                [Pb. PET  1985]

    A)                 \[2\ g\] atom of nitrogen       

    B)                 \[3\times {{10}^{23}}\] atoms of \[C\]

    C)                 1 mole of \[S\]       

    D)                 \[7.0\ g\] of \[Ag\]

    Correct Answer: B

    Solution :

               A. 2gm atom of nitrogen = 28gm            B. \[6\times {{10}^{23}}\] atoms of C has mass \[=12gm\]                    \[3\times {{10}^{23}}\]atoms of C has mass \[=\frac{12\times 3\times {{10}^{23}}}{6\times {{10}^{23}}}=6gm\]                    C. 1mole of S has mass = 32gm                    D. 7.0gm of Ag                                 So, lowest mass = 6gm of C.

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