A) \[N{{a}_{2}}S{{O}_{4}}\]
B) \[N{{H}_{4}}Cl\]
C) \[NaCl\]
D) \[CaC{{l}_{2}}\]
Correct Answer: B
Solution :
Key Idea: Only the salts of strong acid and weak base or weak acid and strong base undergo hydrolysis to produce acidic or alkaline solutions. (i) \[N{{a}_{2}}S{{O}_{4}}\]: Salt of strong acid \[{{H}_{2}}S{{O}_{4}}\] and strong base \[NaOH\]. (ii) NaCI: Salt of strong acid \[HCl\] and strong base \[NaOH\]. (iii) \[CaC{{l}_{2}}\]: Salt of strong acid \[HCl\] and strong base \[Ca{{(OH)}_{2}}\]. \[\because \] \[N{{a}_{2}}S{{O}_{4}},\,NaCl\] and \[CaC{{l}_{2}}\] are salts of strong acid and strong base. \[\therefore \] They do not undergo hydrolysis. (iv) \[N{{H}_{4}}Cl\]: Salt of weak base \[N{{H}_{4}}OH\] and strong acid \[HCl\]. \[\therefore \] \[N{{H}_{4}}Cl\] hydrolyses as follows: \[N{{H}_{4}}Cl+{{H}_{2}}O\to N{{H}_{2}}OH+HCl\] The resulting solution is acidic because \[HCl\]is strong acid.
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