Question -
Answer -
(a) Hydrogen gas combines with nitrogen to form ammonia.
Answer (a)
Unbalanced: H2 + N2 → NH3
Balanced: 3H2 + N2 → 2NH3
(b) Hydrogen sulphide gas burns in air to give water and sulphur dioxide.
Answer (b)
Unbalanced: H2S + O2 → H2O + SO2
Balanced: 2H2S + 3O2 → 2H2O + 2SO2
(c) Barium chloride reacts with aluminium sulphate to give Aluminium chloride and a precipitate of barium sulphate.
Answer (c)
Unbalanced: BaCl2 + Al2(SO4)3 → AlCl3 + BaSO4
Balanced: 3BaCl2 + Al2(SO4)3 → 2AlCl3 + 3BaSO4
(d) Potassium metal reacts with water to give potassium hydroxide and Hydrogen gas.
Answer (d)
Unbalanced: K + H2O → KOH + H2
Balanced: 2K + 2H2O → 2KOH + H2