A) \[NaN{{O}_{3}}\]
B) \[N{{H}_{4}}Cl\]
C) \[N{{a}_{2}}C{{O}_{3}}\]
D) \[FeC{{l}_{3}}\]
Correct Answer: C
Solution :
Key Idea The salt of weak acid and strong base on hydrolysis gives alkaline solution. \[NaN{{O}_{3}}\]On hydrolysis gives neutral solution, as solution contains both strong acid and strong base. \[NaN{{O}_{3}}+{{H}_{2}}O\xrightarrow{{}}\underset{\begin{smallmatrix} strong \\ base \end{smallmatrix}}{\mathop{NaOH}}\,\,\,\,+\underset{\begin{smallmatrix} strong \\ acid \end{smallmatrix}}{\mathop{HN{{O}_{3}}}}\,\] \[N{{H}_{4}}Cl\] On hydrolysis gives acidic solution as the solution contains strong acid and weak base. \[N{{H}_{4}}Cl+{{H}_{2}}O\xrightarrow{{}}\underset{\begin{smallmatrix} weak \\ base \end{smallmatrix}}{\mathop{N{{H}_{4}}OH}}\,\,\,+\underset{\begin{smallmatrix} strong \\ acid \end{smallmatrix}}{\mathop{HCl}}\,\] \[N{{a}_{2}}C{{O}_{3}}\] On hydrolysis gives alkaline solution as the solution contains strong base and weak acid. \[N{{a}_{2}}C{{O}_{3}}+2{{H}_{2}}O\xrightarrow{{}}\underset{\begin{smallmatrix} strong \\ base \end{smallmatrix}}{\mathop{2NaOH}}\,\,\,\,+\underset{\begin{smallmatrix} weak \\ acid \end{smallmatrix}}{\mathop{{{H}_{2}}C{{O}_{3}}}}\,\] \[FeC{{l}_{3}}\] On hydrolysis gives acidic solution as the solution contain strong acid and weak base. \[FeC{{l}_{3}}+3{{H}_{2}}O\xrightarrow{{}}\underset{\begin{smallmatrix} weak \\ base \end{smallmatrix}}{\mathop{Fe{{(OH)}_{3}}}}\,\,\,\,+\underset{\begin{smallmatrix} strong \\ acid \end{smallmatrix}}{\mathop{3HCl}}\,\]
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