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

Options

A. `CH_(3)COONa`
B. `Na_(2)C_(2)O_(4)`
C. `C_(6)H_(5)COONa`
D. HCOONa

Answer

B

Explanation

Since the sodium salt of the oragnic acid 'X' reacts with acidified aqueous `CaCl_(2)` solution to give a wihte precipitate the compound 'X' is sodium oxalate. The series of reactions involved are listed.
`underset((X))underset("Sod. Oxalate")(Na_(2)C_(2)O_(4))+underset("(Conc.)")(H_(2)SO_(4)) to Na_(2)SO_(4) + underset("(Oxalic acid)")(H_(2)C_(2)O_(4))`
`H_(2)C_(2)O_(4) underset(-H_(2)O)overset(conc. H_(2)SO_(4)//Heat)(to)underset("Effervescence")ubrace(CO+CO_(2)) `
`underset((X))(Na_(2)C_(2)O_(4))+CaCl_(2 (aq)) to underset("(White ppt.)")underset("Cal. Oxalate")(CaC_(2)O_(4))+2NaCl`
`underset("(White ppt.)")(5CaC_(2)O_(4))+ underset("(Purple)")+8H_(2)SO_(4) to K_(2)SO_(4)+5CaSO_(4)+ underset("(Colourless)")(2MnSO_(4))+10CO_(2)+8H_(2)O`