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

When sodium chloride solution is electrolysed,the gas that is liberated at the cathode is

On electrolysing a solution of dilute $H_2SO_4$ between platinum electrodes,the gas evolved at the anode is

During the electrolysis of aqueous $NaCl$,if $3 \ mole$ of $H_2O$ are electrolysed,then how much charge (in $F$) is required if the current efficiency is $75 \ \%$?

When an aqueous solution of sodium sulfate $(Na_2SO_4)$ is electrolyzed using platinum electrodes,what are the products at the cathode and anode,respectively?

If $1 \ A$ of current is passed through $CuSO_4$ solution for $10 \ s$,then the number of copper ions deposited at the cathode will be about