JEE Main · 2017 · 02 Apr 2017 · Offline · Practical and Analytical Chemistry

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Sodium salt of an organic acid 'X' reacts with aqueous CaCl₂ solution to give a white precipitate. The organic acid salt 'X' is:

(A)HCOONa
(B) $C H_{3} COONa$
(C) $N a_{2} C_{2} O_{4}$ ✓ Correct
(D) $C_{6} H_{5} COONa$

Answer: (C)

Solution

The oxalate

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

gives a white precipitate of

Ca C_{2} O_{4}

with

C a^{2 +}

and decolourises acidified

KMn O_{4}

(oxidised to

C O_{2}

); formate, acetate and benzoate salts do neither. Hence X

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

JEE Main · 2017 · 02 Apr 2017 · Offline · Single correct option

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