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JEE Main & Advanced JEE Main Paper (Held On 09-Jan-2019 Morning)

  • question_answer
    A solution of sodium sulfate contains \[92\text{ }g\text{ }of\text{ }N{{a}^{+}}\] ions per kilogram of water. The molality of \[N{{a}^{+}}\] ions in that solution in \[mol\text{ }k{{g}^{-1}}\] is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 8

    B) 4

    C) 12

    D) 16

    Correct Answer: B

    Solution :

    \[m\,\,=\,\,\frac{moles\,\,of\,\,N{{a}^{+}}}{mass\,\,of\,\,{{H}_{2}}O\,\,in\,\,kg}\,\,=\,\,\frac{92/23}{l}\,\,=\,\,4\,\,m\]


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