4(iv)
Choose the answer from the list of compounds given below:
sodium bisulphite, ferric oxide, iron (II) chloride, sodium sulphate, aluminium oxide
(a) A compound which is a major constituent of bauxite.
(b) The compound which will form a dirty green precipitate with NaOH.
(c) An acid salt.
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(a) Aluminium oxide — Bauxite is hydrated aluminium oxide, Al2O3·2H2O.
(b) Iron(II) chloride — Fe2+ ions form a dirty green precipitate of iron(II) hydroxide with NaOH.
(c) Sodium bisulphite — Sodium hydrogen sulphite (NaHSO3) still has a replaceable hydrogen ion, so it is an acid salt.