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  and 
. Sodium is deposited at cathode and chlorine at anode as a by-product.
At Cathode - 
At anode-  
If an aqueous solution of NaCl is subjected to electrolysis, dihydrogen gas  is evolved at the cathode while chlorine 
 is obtained at the anode.