CBSE Class 12 · 2001 · Delhi Compartment · d and f Block ElementsShort Answer

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Write balanced ionic equations for what happens when:
i) acidified potassium permanganate solution is treated with oxalate ion
ii) iodide ion is treated with acidified dichromate ion

Answer: (i) 2MnO₄⁻+5C₂O₄²⁻+16H⁺→2Mn²⁺+10CO₂+8H₂O. (ii) Cr₂O₇²⁻+6I⁻+14H⁺→2Cr³⁺+3I₂+7H₂O.

Solution

(i) Permanganate oxidises oxalate to CO

_{2}

2Mn O_{4}^{-} + 5 C_{2} O_{4}^{2 -} + 16 H^{+} \to 2M n^{2 +} + 10C O_{2} + 8 H_{2} O

(ii) Dichromate oxidises iodide to iodine:

C r_{2} O_{7}^{2 -} + 6 I^{-} + 14 H^{+} \to 2C r^{3 +} + 3 I_{2} + 7 H_{2} O

CBSE Class 12 Board · 2001 · Delhi Compartment · Subjective

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