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A compound (X) when heated with conc. H(...

A compound (X) when heated with conc. `H_(2)SO_(4)` gives one gaseous product, which under pressure forms sodium methanoate with `NaOH`. How many of the list- HCOOH, `K_(4)Fe (CN)_(6), H_(2)C_(2)O_(4), CH_(2) (COOH)_(2)` can be (X) ?

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