When a piece of sodium is dropped in water.

When a piece of sodium metal is dropped in water, hydrogen gas evolved because

What happens when a. Sodium metal is dropped in water? b. Sodium metal is heated in free supply of air? c. Sodium peroxide dissolves in water?

When you have fever, keeping a piece of linen cloth dipped in water on your forehead helps reduce temperature.

What happens when: a. Potassium metal is dropped in water b. Potassium is heated in free supply of air c. Potassium superoxide is dissolved in water

When a drop of oil is spread on a water surface, it displays beautiful colours in daylight because of

The swelling of a piece of wood occurs when placed in water. Would you describe this as growth? Explain it.

In the reaction of sodium hydride and water:

When sodium is added in scanty water, it catches fire. In this process which one of the following burns ?

What is the net force on a piece of wood floating on water?

Molten sodium chloride and sodium chloride dissolved in water .