Question

What happens when calcium is treated with water?

1. It does not react with water
2. It reacts violently with water
3. It reacts less violently with water
4. Bubbles of hydrogen gas formed stick to the surface of calcium

पर्याय

• (i) and (iv)

• (ii) and (iii)

• (i) and (ii)

• (iii) and (iv)

Answer 1

(iii) and (iv)

Explanation - 

Calcium reacts slowly with water. If a piece of calcium is dropped into a non-reactive container containing water after some times bubbles of hydrogen gas are seen stuck to the surface of the metal.