JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Critical Thinking

  • question_answer
    The \[pH\] of \[0.1\,\,M\] solution of the following salts increases in the order                                  [IIT 1999]

    A)                 \[NaCl<N{{H}_{4}}Cl<NaCN<HCl\]

    B)                 \[HCl<N{{H}_{4}}Cl<NaCl<NaCN\]

    C)                 \[NaCN<N{{H}_{4}}Cl<NaCl<HCl\]

    D)                 \[HCl<NaCl<NaCN<N{{H}_{4}}Cl\]

    Correct Answer: D

    Solution :

               \[N{{H}_{4}}Cl\]undergoes cationic hydrolysis hence pH is \[>7\] because the solution due to cationic hydrolysis in acids.            NaCN undergoes anionic hydrolysis hence pH is >7.                    HCl is strong acid and NaCl is neutral solution.                    Hence the pH of given solutions will increases.                                 \[HCl<NaCl<NaCN<N{{H}_{4}}Cl\]


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