(i) Name the gas.
(ii) Name the method of collection of the gas.
(iii) Is the gas soluble or insoluble in water?
(iv) Is the gas lighter or heavier than air?
(i) Hydrogen gas, because when metal react with acid, it forms salt and hydrogen gas.
Metal +Acid → Salt + H2 ↑
(ii) Downward displacement of water
(iii) Insoluble in water
(iv) The gas H2 is lighter than air
