Which of the following gases is evolved at the anode during the electrolysis of sodium acetate?

Electrolysis of concentrated aqueous solution of $NaCl$ results in

What happens to the $pH$ during the electrolysis of aqueous $CuSO_4$ using platinum electrodes?

Predict the products of electrolysis in each of the following:
$(i)$ An aqueous solution of $AgNO_3$ with silver electrodes.
$(ii)$ An aqueous solution of $AgNO_3$ with platinum electrodes.
$(iii)$ $A$ dilute solution of $H_2SO_4$ with platinum electrodes.
$(iv)$ An aqueous solution of $CuCl_2$ with platinum electrodes.

Give the electrolytic reaction of $CuSO_4$ solution using $Cu$ electrodes.

The product obtained at the anode when $50 \%$ $H_2SO_4$ aqueous solution is electrolysed using platinum electrodes is: