JEE Main & Advanced Chemistry Equilibrium Question Bank Common ion effect, Isohydric solutions, Solubility product, Ionic product of water and salt hydrolysis

  • question_answer At equilibrium, if to a saturated solution of \[NaCl,\,HCl\] is passed, \[NaCl\] gets precipitated because [RPMT 1999]

    A)                 \[HCl\] is a strong acid

    B)                 Solubility of \[NaCl\] decreases 

    C)                 Ionic product of \[NaCl\] becomes greater than its \[{{K}_{sp}}\]

    D)                 \[HCl\] is a weak acid

    Correct Answer: C

    Solution :

               \[NaC{{l}_{(\text{s})}}\] ⇌ \[Na_{(\text{aq})}^{+}+Cl_{(\text{aq})}^{-}\]                    \[HCl\]⇌ \[{{H}^{+}}+C{{l}^{-}}\]. The increase in \[[C{{l}^{-}}]\]brings in an increase in \[[N{{a}^{+}}]\]\[[C{{l}^{-}}]\]which will lead for backward reaction because                    \[{{K}_{sp}}(NaCl)=[N{{a}^{+}}]\,\,[C{{l}^{-}}]\]                                 means Ionic product \[\ge {{K}_{sp}}\]


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