SATHEE: Transition and InnerTransition Elements

Transition and InnerTransition Elements - Result Question 14

####15. Sodium salt of an organic acid ’ $X$ ’ produces effervescence with conc. $H_{2} S O_{4}$ . ’ $X$ ’ reacts with the acidified aqueous $C a C l_{2}$ solution to give a white precipitate which decolourises acidic solution of $K M n O_{4} \cdot$ ’ $X$ ’ is (2017 Main)

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

(b) $H C O O N a$

(d) $N a_{2} C_{2} O_{4}$

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Solution:

The reaction takes place as follows

$\begin{aligned} \underset{(X)}{N a_{2} C_{2} O_{4}} + \underset{(Conc.)}{H_{2} S O_{4}} ⟶ N a_{2} S O_{4} + H_{2} O \underset{Effervescence}{+ C O ↑} + C O_{2} ↑ & N a_{2} C_{2} O_{4} + C a C l_{2} ⟶ C a C_{2} O_{4} + 2 N a C l & 5 C a C_{2} O_{4} + 2 K M n O_{4} + 8 H_{2} S O_{4} ⟶ K_{2} S O_{4} + 5 C a S O_{4} & Purple & + 2 M n S O_{4} + 10 C O_{2} + 8 H_{2} O & Colourless \end{aligned}$

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Transition and InnerTransition Elements - Result Question 14

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