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

  • question_answer Why pure \[NaCl\] is precipitated when \[HCl\] gas is passed in a saturated solution of \[NaCl\] [NCERT 1977; MP PMT 1987; CPMT 1974, 78, 81]

    A)                 Impurities dissolves in \[HCl\]

    B)                 The value of \[[N{{a}^{+}}]\]and \[[C{{l}^{-}}]\] becomes smaller than \[{{K}_{sp}}\] of \[NaCl\]

    C)                 The value of \[[N{{a}^{+}}]\]and \[[C{{l}^{-}}]\] becomes greater than \[{{K}_{sp}}\] of \[NaCl\]

    D)                 \[HCl\]dissolves in the water

    Correct Answer: C

    Solution :

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

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