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Uttarakhand PMT Uttarakhand PMT Solved Paper-2008

  • question_answer
    If\[N{{a}^{+}}\]is larger than\[M{{g}^{2+}}\]ion an\[{{S}^{2-}}\]ion is larger than\[C{{l}^{-}}\]ion, which of the following will be stable soluble in water?

    A)  Sodium chloride

    B)  Sodium sulphide

    C)  Magnesium chloride

    D)  Magnesium sulphide

    Correct Answer: D

    Solution :

     Magnesium sulphide. Higher the lattice energy lower the solubility. Out of the four combinations possible, the lattice energy of \[MgS\](bi-bivalent ionic solid) is higher than those of\[N{{a}_{2}}S,MgC{{l}_{2}}\](uni-bivalent or biuni- valent ionic solids) and\[NaCl\]uni-univalent ionic solids) and hence,\[MgS\] is the least soluble.


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