Question:
Which of the following salt undergoes anionic hydrolysis ?
Which of the following salt undergoes anionic hydrolysis ?
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Anionic hydrolysis happens for salts of a strong base and a weak acid.
Updated On: Oct 1, 2026
- \(\text{CuSO}_4\)
- \(\text{Na}_2\text{CO}_3\)
- \(\text{NH}_4\text{Cl}\)
- \(\text{FeCl}_3\)
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The Correct Option is B
Solution and Explanation
Step 1: Recall the idea
Anionic hydrolysis means the anion of the salt reacts with water and gives \(OH^-\). This happens when the anion comes from a weak acid and the cation comes from a strong base. The solution becomes basic.
Step 2: Check each salt
\(Na_2CO_3\) is made from strong base NaOH and weak acid \(H_2CO_3\). The carbonate ion hydrolyses: \(CO_3^{2-} + H_2O \rightleftharpoons HCO_3^- + OH^-\).
\(CuSO_4\), \(NH_4Cl\) and \(FeCl_3\) contain weak-base cations (\(Cu^{2+}\), \(NH_4^+\), \(Fe^{3+}\)) and anions of strong acids, so they undergo cationic hydrolysis and give acidic solutions.
Final Answer:
Only Na2CO3 undergoes anionic hydrolysis. \[ \boxed{\text{(B)}\ Na_2CO_3} \]
Anionic hydrolysis means the anion of the salt reacts with water and gives \(OH^-\). This happens when the anion comes from a weak acid and the cation comes from a strong base. The solution becomes basic.
Step 2: Check each salt
\(Na_2CO_3\) is made from strong base NaOH and weak acid \(H_2CO_3\). The carbonate ion hydrolyses: \(CO_3^{2-} + H_2O \rightleftharpoons HCO_3^- + OH^-\).
\(CuSO_4\), \(NH_4Cl\) and \(FeCl_3\) contain weak-base cations (\(Cu^{2+}\), \(NH_4^+\), \(Fe^{3+}\)) and anions of strong acids, so they undergo cationic hydrolysis and give acidic solutions.
Final Answer:
Only Na2CO3 undergoes anionic hydrolysis. \[ \boxed{\text{(B)}\ Na_2CO_3} \]
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