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NEET Sample Paper NEET Sample Test Paper-40

  • question_answer
      A 0.0020 m aqueous solution in an ionic com- pound \[Co{{(N{{H}_{3}})}_{5}}(N{{O}_{2}})Cl\]freezes at\[-0.00732{{\,}^{o}}C.\] Number of moles of ions which 1 mol of ionic compound produces on being dissolved in water will be \[({{K}_{f}}=+1.86{{\,}^{o}}C/m)\]

    A)  1

    B)  4

    C)  3

    D)  2

    Correct Answer: D

    Solution :

    \[\Delta {{T}_{f}}=i\times K\times molality\] \[0.00732=i\times 1.86\times 0.002\] \[\therefore \]\[i=1.96=2\] \[\therefore \]\[[Co{{(N{{H}_{3}})}_{5}}.(N{{O}_{2}})]Cl\xrightarrow{{}}\] \[{{[Co{{(N{{H}_{3}})}_{5}}N{{O}_{2}}]}^{+}}+C{{l}^{-}}\]


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