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)

Answer: Correct option is (D) (iii) and (iv)

Calcium is known to be a silvery-white metal. Calcium is considered to be relatively soft. However, it is considered to be much harder in comparison to the sodium metal. Calcium belongs to the alkaline-earth metals. These kinds of metals tend to react vigorously with the water. Calcium is a highly reactive metal that reacts violently in a less manner with water. When calcium reacts with water, it tends to displace hydrogen from the water. Along with this, it produces bubbles of hydrogen gas as well as calcium hydroxide. Therefore, the correct option to this question is (D) (iii) and (iv).