(a(i))[2]
Of R, S, T and U, which two are covalently bonded?
(a(ii))[2]
Which two of R, S, T or U conduct electricity in the solid state?
(a(iii))[1]
Which of R, S, T or U has the lowest melting point?
(a(iv))[1]
Which of R, S, T or U is soluble in water?
(b(i))[1]
Balance this chemical equation for the reaction. $\text{P}_4 + 5\text{O}_2 \rightarrow \ldots \text{P}_2\text{O}_5$
(b(ii))[1]
Would phosphorus(V) oxide be classed as acidic or basic? Give a reason for your answer.
(c(i))[1]
Which one of the following ions is also found in many fertilisers? Draw a circle around the correct answer. Ba$^{2+}$, Cu$^{2+}$, F$^-$, NO$_3^-$.
(c(ii))[1]
Why do farmers apply fertilisers to their fields?