**Match Column I with Column II (Titration characteristics):**
**Column I:**
(A) vs
(B) vs Oxalic acid
(C) vs
(D) vs
**Column II:**
(p) Self-indicator
(q) Exter

Question

**Match Column I with Column II (Titration characteristics):**
**Column I:**
(A) $K_2Cr_2O_7$ vs $Fe^{2+}$
(B) $KMnO_4$ vs Oxalic acid
(C) $I_2$ vs $Na_2S_2O_3$
(D) $NaOH$ vs $HCl$
**Column II:**
(p) Self-indicator
(q) External/Internal indicator needed
(r) Starch used near endpoint
(s) Phenolphthalein/Methyl orange

Prashant Kotian · Accepted Answer

Correct answer: A. **Logic:**
(A) Requires Diphenylamine (internal) or (external).
(B) is a self-indicator (purple to colorless).
(C) Starch is the standard indicator for iodometry ().
(D) Standard acid-base indicators like Ph or MeOH are used.

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