(a)[3]
State which two of P, Q, R, S and T are covalent molecules. Give two reasons for your choice.
(b)[1]
Suggest whether its oxide is acidic or basic. Explain your answer with a reason.
(c)[1]
Explain, using electronic structure, why krypton is unreactive.
(d)[2]
Give two other ways in which the properties of transition elements are different from those of Group I elements.
(e)[2]
Arrange the four metals in order of reactivity. Put the least reactive metal first.
(f)[1]
Complete the equation by writing the symbol for a reversible reaction in the box.\n\n$3\text{Fe} + 4\text{H}_2\text{O} \; [BLANK] \; \text{Fe}_3\text{O}_4 + 4\text{H}_2$
(g)[1]
State what is meant by the term alloy.