1) What happens to the black copper (II) oxide solid as ammonia gas is passed over it?

(a)

It dissolves

(b)

Its colour slowing changes to red-brown

(c)

It remains unchanged

2) The statements below describe some properties that show that the colourless liquid collected in the u-tube is water. Which statement is false?

(a)	The liquid boils at exactly 100 c at sea
(b)	The liquid changes colour of blue litmus paper red
(c)	The liquid changes colour of cobalt chloride paper from blue to pink

3) Which gas is collected in the gas jar?

(a)

Carbon (II) Oxide

(b)

Nitrogen

(c)

Sulphur (IV) Oxide