4(ii)
Write balanced chemical equations for the following:
(a) Laboratory preparation of hydrochloric acid from a less volatile acid.
(b) Bromine gas is passed over ethene in the presence of carbon tetrachloride.
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(a) NaCl + conc. H2SO4 ⟶ NaHSO4 + HCl
(b) C2H4 + Br2 ⟶ C2H4Br2