(a)[5]
Describe these substances' physical properties by considering: • volatility • solubility in water • electrical conductivity when solid.
(b)[1]
During electrolysis of dilute sulfuric acid with inert electrodes, oxygen gas appears at the positive electrode. Name the gas formed at the negative electrode.
(c(i))[2]
Complete the word equation below for this reaction. sodium bromide + chlorine $\rightarrow$ ............... + ...............
(c(ii))[1]
Explain, in terms of halogen reactivity, why aqueous sodium chloride does not react with aqueous bromine.