(a)[3]
Identify this gas and state the test for it.
(b)[3]
Explain both statements.
(c(i))[2]
Which species is reduced in the electrolysis? Explain your answer.
(c(ii))[3]
State how the masses of the two copper electrodes changed, and explain why. Use the ionic half-equations to guide your answer.
(c(iii))[1]
Explain why the colour of the copper(II) sulfate solution stays the same during electrolysis.