Which of the following statements is not correct regarding preparation of NaOH?

NaOH is prepaid by electrolysis of sodium chloride in Castner -Kellner cell.

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Sodium metal discharged at cathode combines with mercury to form sodium amalgam.

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Chlorine is evolved at anode.

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Amalgam is heated to separate Na and Hg.

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Solution

The correct option is D Amalgam is heated to separate Na and Hg.
The process of preparing NaOH solution by electrolysis of sodium chloride in Castner-Kelner cell is called Castner-Kelner Process.
$\Rightarrow 2 c ¯ l ⟶ C l_{2} + 2 e^{-}$ [Anode]
$2 N + a + 2 e^{-} ⟶ 2 N a$ [Cathode]
$2 N a + H g ⟶ N a - H g$ [Amalgam]
$2 N a - H g + 2 H_{2} O \to 2 N a O H + 2 H g + H_{2}$
* Chlorine gas is evolved at anode.
* Amalgam is formed by addition of sodium and mercury.

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Similar questions

H_{2}

Given are the reactions occuring during the electrolysis of sodium chloride solution:

$2 C l^{-} \to C l_{2} + 2 e^{-}$
$2 H_{2} O + 2 e^{-} \to H_{2} + 2 O H^{-}$

Which of the following is correct regarding liberation of electrolytic products?

C d C l_{2}

5

12

C d - H g

2 g

C d = 112.40

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