Question

A metal is treated with dilute sulphuric acid. The gas evolved is collected by the method shown in the figure. Answer the following:

(a) Name the gas.
(b) Name the method of collection of the gas.
​(c) Is the gas soluble or insoluble in water?
(d) Is the gas lighter or heavier than air?

Answer 1

When a metal(M) is treated with dilute sulphuric acid, metal will displace hydrogen and form metal sulphate, along with colourless and odourless hydrogen gas. Hydrogen gas produced in the reaction will evolve with bubbles.

$\mathrm{M}+{\mathrm{H}}_2{\mathrm{SO}}_4\to {\mathrm{MSO}}_4+{\mathrm{H}}_2$

(a) Hydrogen gas will evolve.

(b) The method of collection of the gas shown in the figure is known as "downward displacement of water".

(c) Hydrogen gas is insoluble in water.

(d) Hydrogen gas is lighter than air.