Sodium salt of an organic acid $' X'$ produces effervescence with conc. $H_{2} S O_{4} .' X'$ reacts with the acidified aqueous ${CaCl}_{2}$ solution to give a white precipitate which decolourises acidic solution of ${KMnO}_{4} .' X'$ is

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${Na}_{2} C_{2} O_{4}$

$HCOONa$

$C_{6} H_{5} C O O N a$

${CH}_{3} C O O N a$

answer is B.

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Detailed Solution

Since the sodium salt of the acid reacts with $H_{2} S O_{4}$ to produce effervescence, therefore, the sodium salt must be sodium oxalate ${Na}_{2} C_{2} O_{4}$

$\underset{S o d . o x a l a t e}{N a_{2} C_{2} O_{4}} + H_{2} S O_{4} (c o n c .) \underset{- N a_{2} S O_{4}}{\to}$

$\underset{O x a l i c a c i d}{[H O O C - C O O H]} \to \underset{E f f e r v e s c e n c e}{C O_{2}} + C O + H_{2} O$

This is confirmed by the fact that $X^{-} (i . e ., C_{2} O_{4}^{2 -})$ gives white ppt. with aq. ${CaCl}_{2}$ which decolourises acidic solution of ${KMnO}_{4} .$