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A salt which gives `CO_2` with hot `H_2 SO_4` and also decolourizes acidified `KMnO_4` on warming is

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A salt which gives `CO_2` with hot `H_2 SO_4` and also decolourizes acidified `KMnO_4` on warming is
A. `HCO_(3)^(-)`
B. `CO_(3)^(2-)`
C. Oxalate ion
D. Acetate ion
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Correct Answer - C
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