Name the gas produced when:

(a) steam is passed over hot coke.

(b) chlorine is dissolved in water and exposed to sunlight.

(c) a piece of calcium is added to water.

(d) when fossil fuel is burnt.

(a) Water gas [CO + H₂]

(b) Oxygen gas (O₂)

(c) Hydrogen gas (H₂)

(d) Carbon dioxide gas (CO₂)