Question

When Mg metal is treated with hot water, it starts floating on the surface of the water. The reason for its different behaviour is:

Options

• Mg is a lighter element than water.

• Mg reacts with water to produce H₂ gas which helps in floating.

• Mg reacts with water to produce N₂ gas which helps in floating.

• Mg reacts with water to form CO₂ gas which helps in floating.

Answer 1

Mg reacts with water to produce H₂ gas which helps in floating.

Explanation:

Magnesium reacts with hot water to form hydrogen gas bubbles. These bubbles stick to the metal surface, providing buoyancy that causes the magnesium to rise and float.