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Preparations and Uses of Caustic Soda

Sodium hydrox...

Question

Sodium hydroxide is manufacture by the electrolysis of brine solution. The reaction by-products are:

C l_{2}

and

H_{2}

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C l_{2}

and Na-Hg

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C l_{2}

and NaCl

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C l_{2}

and

O_{2}

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Solution

The correct option is A $C l_{2}$ and $H_{2}$
The electrolysis of brine solution to prepare sodium hydroxide can be given as follow:
$N a C l (c o n c .) ⇌ N a^{+} + C l^{-}$
$H_{2} O ⇌ H^{+} + O H^{-}$
At cathode: $2 H^{+} 2 e^{-} \to H_{2} ↑$
At anode: $2 C l^{-} \to C l_{2} ↑ + 2 e^{-}$
$N a^{+} + O H^{-} \to N a O H$

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Similar questions

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 l_{2}

H_{2}

H_{2}

C l_{2}

C l_{2}

H_{2} O

2 N a + 2 H_{2} O \to 2 N a O H + H_{2}

2 N a O H + C l_{2} \to N a C l + N a O C l + H_{2} O

4 O H^{-} \to O_{2} + 2 H_{2} O + 4 e^{-}

2 C l^{-} \to C l_{2} + 2 e^{-}

N a C l

C l_{2}

N a O H

H_{2}

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