**Match Column I (Titration) with Column II (Indicator Used):**
**Column I:**
(A) vs
(B) vs
(C) vs
(D) vs
**Column II:**
(p) Methyl Orange
(q) Phenolphthalein

Question

**Match Column I (Titration) with Column II (Indicator Used):**
**Column I:**
(A) $NaOH$ vs $CH_3COOH$
(B) $NH_4OH$ vs $HCl$
(C) $NaOH$ vs $HCl$
(D) $KMnO_4$ vs $FeSO_4$
**Column II:**
(p) Methyl Orange
(q) Phenolphthalein
(r) Any of p or q
(s) No external indicator

Prashant Kotian · Accepted Answer

Correct answer: A. **Logic:**
(A) Weak Acid-Strong Base: Endpoint pH > 7, use Phenolphthalein.
(B) Weak Base-Strong Acid: Endpoint pH < 7, use Methyl Orange.
(C) Strong Acid-Strong Base: Sharp pH change from 3-11, any indicator works.
(D) is its own indicator (Self-indicator).

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