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Sodium salt of an organic acid 'X' produces effervescence with conc. H 2 SO 4 . 'X' reacts with the acidified aqueous CaCl 2 solution to give a white precipitate which decolourises acidic solution of KMnO 4 . 'X' is -

1. CH 3 COONa
2. Na 2 C 2 O 4
3. C 6 H 5 COONa
4. HCOONa Students may find similar question in CP exercise sheet : [ JEE Advance, Chapter : Salt analysis, Exercise # 1, Q. No. 19 ]

Correct answer: Na 2 C 2 O 4

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