1 Suggest a reason for only ‘roughly’ twice as much hydrogen gas being produced at the cathode as oxygen gas at the anode in the electrolysis of water.

it's all four options.

the formula for the conversion of temperature from degree celsius to kelvin is:

the sample of water at is converted to kelvin temperature by using the above formula as:

on comparing the two samples of water at or we can say that at and at respectively. the difference between the temperatures of two samples of water is:

hence, one can say that the sample of water at is greater than the sample of water at by .