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 :
| (i) \[HCl\] is a strong acid. Hence its\[pH\]is lowest among the others. |
| (ii) \[NaCl\]is a salt of strong acid and strong base so it is not hydrolysed and hence its \[pH\]is 7. |
| (iii) \[N{{H}_{4}}Cl+{{H}_{2}}O\rightleftharpoons N{{H}_{4}}OH+HCl\] |
| \[\therefore \] The solution is acidic and \[pH\]is less than that of \[0.1\,M\,HCl\]. |
| (iv) \[NaCN+{{H}_{2}}O\rightleftharpoons NaOH+HCN\] |
| \[\therefore \] The solution is basic and pH is more than that of \[0.1\,M\,HCl\]. |
| \[\therefore \] Correct order for increase in pH is \[HCl<N{{H}_{4}}Cl<NaCl<NaCN\]. |
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