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Standard IX

Chemistry

pH of a Solution

NaClaq is ele...

Question

$N a C l (a q)$ is electrolysed. The $p H$ of solution after electrolysis will

decrease

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increase

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> 7

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< 7

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Solution

The correct options are
B increase
D $> 7$
During electrolysis of aq NaCl solution, the following reaction occurs at a negative electrode.
$2 H^{+} + 2 e^{-} \to H_{2}$
Hence, during electrolysis, the hydrogen ion concentration decreases and the pH of the solution increases.
This results in an alkaline solution.

Both option (B) and (C) are correct.

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NaCl(aq) is electrolysed. The pH of solution after electrolysis will

$N a C l (a q)$ is electrolysed. The $p H$ of solution after electrolysis will