Question:
Which from following the compound in aqueous medium having minimum pH?
Which from following the compound in aqueous medium having minimum pH?
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The salt of a strong acid and weak base hydrolyses to give an acidic solution.
Updated On: Nov 13, 2026
- NaOH
- \(NH_4Cl\)
- \(Na_2CO_3\)
- NaCl
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
The lowest pH belongs to the most acidic solution.
Step 2: Classify
NaOH is a strong base, \(\text{Na}_2\text{CO}_3\) is a salt of a strong base with a weak acid and is basic, and NaCl is neutral.
Step 3: Acidic Salt
\(\text{NH}_4\text{Cl}\) is a salt of a weak base with a strong acid: \( \text{NH}_4^{+} + \text{H}_2\text{O} \rightleftharpoons \text{NH}_3 + \text{H}_3\text{O}^{+} \). It is acidic, so its pH is lowest. This is option (B).
Final Answer:
NH4Cl solution has the minimum pH. \[ \boxed{\text{(B) }\text{NH}_4\text{Cl}} \]
The lowest pH belongs to the most acidic solution.
Step 2: Classify
NaOH is a strong base, \(\text{Na}_2\text{CO}_3\) is a salt of a strong base with a weak acid and is basic, and NaCl is neutral.
Step 3: Acidic Salt
\(\text{NH}_4\text{Cl}\) is a salt of a weak base with a strong acid: \( \text{NH}_4^{+} + \text{H}_2\text{O} \rightleftharpoons \text{NH}_3 + \text{H}_3\text{O}^{+} \). It is acidic, so its pH is lowest. This is option (B).
Final Answer:
NH4Cl solution has the minimum pH. \[ \boxed{\text{(B) }\text{NH}_4\text{Cl}} \]
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