# 6.24 Name the processes from which chlorine is obtained as a by-product. What will happen if an aqueous solution of NaCl is subjected to electrolysis?

In Down's process, we prepare sodium metals in which chlorine is obtained as a by-product. It involves electrolysis of a fused mixture of $NaCl$ and $CaCl_{2}$. Sodium is deposited at cathode and chlorine at anode as a by-product.

$NaCl(l)\rightarrow Na^{+}(melt)+Cl^{-}(melt)$

At Cathode - $Na^{+}+e^{-}\rightarrow Na$

At anode-  $\dpi{100} Cl^{-}\rightarrow \frac{1}{2}Cl_{2}+e^{-}$

If an aqueous solution of NaCl is subjected to electrolysis, dihydrogen gas $(H_{2})$ is evolved at the cathode while chlorine $(Cl_{2})$ is obtained at the anode.

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