Q21 of 38 Page 64

What is the difference between the smell of H2S gas and H2 gas?

Hydrogen gas is a colourless, odourless gas and is also combustible whereas hydrogen sulphide, H2S is a colourless gas with the smell of rotten eggs. It is produced by bacteria.


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19

Name one non-metal which is liquid.

 20

Name a metal which is liquid.

 22

Give one example of each of the following:

(a) Aerosol


(b) Solution

 23

Give the names of the elements present in the following compounds:

(a) Quick lime


(b) Hydrogen bromide


(c) Baking powder


(d) Potassium sulphate