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Chemical Reactivity (Group 1)

A salt which ...

Question

A salt which gives $C O_{2}$ with hot $H_{2} S O_{4}$ and also decolourises acidified $K M n O_{4}$ on warming is:

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oxalate

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acetate

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Solution

The correct option is C
oxalate

Oxalates are stron reducing agents and decolourize acidified $K M n O_{4}$

$M n O_{4}^{-} + 8 H^{+} + 5 e^{-} ⟶ M n^{2 +} + 4 H_{2} O] \times 2 C_{2} O_{4}^{2 -} ⟶ 2 C O_{2} + 2 e^{-}] \times 5 2 M n O_{4}^{-} + 5 C_{2} O_{4}^{2 -} + 16 H^{+} ⟶ M n^{2 +} + 10 C O_{2} + 8 H_{2} O C O O H | c o n c . H_{2} S O_{4} - ------ \to 90^{0} C H_{2} O + C O + C O_{2} C O O H$

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