Several blocks of magnesium are fixed to the bottom of a ship to

• s-Block

Several blocks of magnesium are fixed to the bottom of a ship to

1. prevent puncturing by under ­sea rocks
2. make the ship lighter
3. prevent action of water and salt
4. keep away the sharks

Answer

Magnesium, on account of its lightness, great affinity for oxygen and toughness is used in ship. Being a lighter element, magnesium makes the ship lighter when it is fixed to the bottom of the ship.

The correct option is B.