A solution of caustic soda (NoOH) in water or when fused,conducts electric current. What is the similarity in these two cases?

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Solution

When $N a O H$ is fused,if we pass an electric current through it,it breaks up into $N a^{+}$ and $O H^{-}$ . The sodium cation migrates towards the cathode and $O H^{-}$ towards anode.
In case of $N a O H$ solution(dilute $N a O H$ ), the solution breaks into $H^{+}, 2 O H^{-}$ and $N a^{+}$ . Here since the concentration of water is more, $H^{+}$ and $O H^{-}$ are collected first through selective discharge of ions.

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Question 46

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