State your observations when:

(a) Ethylene gas is passed through bromine water

(b) Silver nitrate solution is added to hydrochloric acid.

(c) Barium chloride is added to potassium sulphate solution.

(a) When ethylene gas is passed through bromine water, the reddish brown colour of bromine water disappears due to the formation of the colourless dibromoethane.

$\underset{\text{ ethene}}{\text{C}$2\text{H}4} + \text{Br}2 \xrightarrow[\text{[inert solvent]}]{\text{CCl}4} \underset{\text{1,2, dibromooethane [ethylene bromide]}}{\text{C}2\text{H}4\text{Br}_2}

(b) When silver nitrate reacts with Hydrochloric acid it gives a white precipitate of AgCl which is insoluble in nitric acid but soluble in ammonium hydroxide.

AgNO₃ + HCl ⟶ AgCl ↓ + HNO₃

(c) Barium chloride reacts with potassium sulphate to form barium sulphate (a white insoluble solid) and potassium chloride.

BaCl₂ + K₂SO₄ ⟶ BaSO₄ + 2KCl