Q1. [1] § 2.1 UNDERSTANDING THE CHEMICAL PROPERTIES OF ACIDS AND BASES § 2.4 MORE ABOUT SALTS
You have three aqueous solutions A, B and C as given below :
A - Potassium nitrate
B - Ammonium chloride
C - Sodium carbonate
The ascending order of the pH of these solutions is :
- (A) A < B < C
- (B) B < C < A
- (C) C < A < B
- (D) B < A < C
Previously asked in CBSE board exam
2025 31/6/1 Q2
Generated by claude-sonnet-4-6 · 2026-06-15 06:45 · grounding rag
Model Answer
(D) B < A < C
Ammonium chloride (strong acid + weak base → acidic, pH < 7), potassium nitrate (strong acid + strong base → neutral, pH = 7), sodium carbonate (strong base + weak acid → basic, pH > 7).
Explanation
From section 2.4.2: salts of strong acid + weak base are acidic (pH < 7); strong acid + strong base are neutral (pH = 7); strong base + weak acid are basic (pH > 7). NH₄Cl = HCl + NH₄OH (weak base) → acidic; KNO₃ = HNO₃ + KOH (both strong) → neutral; Na₂CO₃ = NaOH + H₂CO₃ (weak acid) → basic. So ascending pH order: B < A < C.
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