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Sodium salt of an organic acid 'X' produces effervescence with conc. H2SO4. 'X' reacts with the acidified aqueous CaCl2 solution to give a white precipitate which decolourises acidic solution of KMnO4. 'X' is

1. CH3COONa
2. Na2C2O4
3. C6H5COONa
4. HCOONa

Correct answer: Na2C2O4

Solution

The correct option, Na2C2O4, is a sodium salt of oxalic acid, which reacts with concentrated H2SO4 to produce carbon dioxide, causing effervescence. Additionally, it forms a white precipitate with CaCl2 due to the formation of calcium oxalate, and it can reduce KMnO4, indicating its ability to act as a reducing agent.

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