Write true or false for the following statements:

Copper does not burn in air, but the hot metal is coated with a black coloured layer of copper (II) oxide.

Write true or false for the following statements:

At ordinary temperature, the surfaces of metals such as magnesium, aluminium, zinc, lead, etc., are covered with a thin layer of oxide which protects the metal from further oxidation.

Write true or false for the following statements:

Iron does not burn on heating but iron filings burn vigorously when sprinkled in the flame of the burner.

Write true or false for the following statements:

Silver and gold react with oxygen at high temperatures.

Write true or false for the following statements:

Hydrogen gas is evolved when a metal reacts with nitric acid.