Sodium metal is kept immersed in kerosene and not water because:
It reacts violently with oxygen but not with water.
It reacts violently with water but not with oxygen.
It reacts with kerosene.
It reacts violently with oxygen and water.
Sodium is a highly reactive metal and reacts violently with oxygen and water producing a large amount of heat and light.
Question 6 What happens when calcium is treated with water?
(i) It does not react with water. (ii) It reacts violently with water. (iii) It reacts less violently with water. (iv) Bubbles of hydrogen gas formed stick to the surface of calcium.
a) (i) and (iv) (b) (ii) and (iii)
(c) (i) and (ii) (d) (iii) and (iv)