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(D) The sodium salt of oxalic acid,$Na_2C_2O_4$ $(X)$,reacts with conc. $H_2SO_4$ to produce $CO$ and $CO_2$ gases,causing effervescence.$Na_2C_2O_4 +

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$Na_2C_2O_4$

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(D) The sodium salt of oxalic acid,$Na_2C_2O_4$ $(X)$,reacts with conc. $H_2SO_4$ to produce $CO$ and $CO_2$ gases,causing effervescence.$Na_2C_2O_4 + H_2SO_4 	o Na_2SO_4 + H_2C_2O_4$$H_2C_2O_4 \xrightarrow{Conc. H_2SO_4} H_2O + CO \uparrow + CO_2 \uparrow$$X$ reacts with $CaCl_2$ to form a white precipitate of calcium oxalate $(CaC_2O_4)$:$Na_2C_2O_4 + CaCl_2 	o CaC_2O_4 \downarrow + 2NaCl$Oxalate ions $(C_2O_4^{2-})$ decolourise acidic $KMnO_4$ solution due to the redox reaction:$5C_2O_4^{2-} + 2MnO_4^{-} + 16H^{+} 	o 10CO_2 \uparrow + 2Mn^{2+} + 8H_2O$Thus,$'X'$ is $Na_2C_2O_4$.

The sodium salt of an organic acid $'X'$ produces effervescence with conc. $H_2SO_4$. $'X'$ reacts with an acidified aqueous $CaCl_2$ solution to give a white precipitate which decolourises an acidic solution of $KMnO_4$. $'X'$ is:

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