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: B
Solution :
In these \[HCl\] is stronger acid. Aqueous solution of \[N{{H}_{4}}Cl\] is slightly acidic. \[N{{H}_{4}}Cl+{{H}_{2}}ON{{H}_{4}}OH+HCL\,\,({{H}^{+}})>(O{{H}^{-}})\]Aqueous \[NaCN\] solution is basic \[NaCN+{{H}_{2}}ONaOH+HCN\,\,\,(O{{H}^{-}})>({{H}^{+}})\]Aqueous \[NaCl\] solution is netural Hence, increasing order of pH \[HCl<N{{H}_{4}}Cl<NaCl<NaCN\]
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