Universal indicator solution is added to a neutral solution of concentrated aqueous sodium
chloride.
The solution, which contains ${H^ + }$ (hydrogen), $N{a^ + }$ (sodium), $C{l^-}$ (chloride) and $O{H^-}$ (hydroxide) ions, is electrolysed.
The product at the cathode is hydrogen gas and the product at the anode is chlorine gas.
What happens to the colour of the indicator in the solution during electrolysis?
1 )
The colour changes from blue to green.
2 )
The colour changes from blue to red.
The colour changes from green to blue.
4 )
The colour changes from green to red.
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