What happens when potassium reacts with excess of oxygen?

Look at the diagram. It shows some metals reacting in water. Put the metals in order of reactivity, starting with the most reactive.

Which of the following statements are incorrect?

I. Reactivity of $\mathrm{Al}$ decreases if it is dipped in nitric acid.

II. Carbon can reduce the oxides of $\mathrm{Na}$ and $\mathrm{Mg}$.

III. $\mathrm{NaCl}$ is a good conductor of electricity in solid state.

The electronic configurations of three elements X, Y and Z are as follows:

X - $2, 8$

Y - $2, 8, 7$

Z - $2, 8, 2$

Which of the following is correct?

Read the given statements and mark the correct option.

Statement 1: Articles made of aluminium do not corrode even though it is an active metal.