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The following are the statements regarding NaOH
A) It is prepared by Castner-Solvay process
B) The cathode in the outer compartments in mercury cathode method is Hg

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B is correct

both are correct

both are wrong

A is correct

answer is C.

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Detailed Solution

A brine solution is electrolysed using a mercury cathode and a carbon anode. Sodium
metal discharged at the cathode combines with mercury to form sodium amalgam.
Chlorine gas is evolved at the anode.

The amalgam is treated with water to give sodium hydroxide and hydrogen gas.
$2 Na - Hg + 2 H_{2} O \overset{}{\to} 2 NaOH + 2 Hg + H_{2}$

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