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Potassium Permanganate

Sodium salt o...

Question

Sodium salt of an organic acid 'X' produces effervescence with $c o n c . H_{2} S O_{4}$ . $^{'} X^{'}$ reacts with the acidified aqueous $C a C l_{2}$ solution to give a white precipitate which decolourizes acidic solution of $K M n O_{4}$ $^{'} X^{'}$ is:

H C O O N a

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C H_{3} C O O N a

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N a_{2} C_{2} O_{4}

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

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Solution

The correct option is C $N a_{2} C_{2} O_{4}$
Sodium salt of an organic acid ' $X$ ' is sodium oxalate $N a_{2} C_{2} O_{4}$ . It gives effervescence of $C O_{2}$ gas with conc. $H_{2} S O_{4}$ .
$N a_{2} C_{2} O_{4} + H_{2} S O_{4} \to N a_{2} S O_{4} + H_{2} O + C O ↑ + C O_{2} ↑$
Sodium oxalate reacts with the acidified aqueous $C a C l_{2}$ solution to give a white precipitate of calcium oxalate.
$N a_{2} C_{2} O_{4} + C a C l_{2} \to C a C_{2} O_{4} ↓ + 2 N a C l$
Sodium oxalate decolourises acidic solution of $K M n O_{4}$ .
$5 C_{2} O_{4}^{2 -} + 16 H^{+} + 2 M n O_{4}^{-} \to 2 M n^{2 +} + 10 C O_{2} + 8 H_{2} O$
Hence, the option (C) is the correct answer.

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