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:

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:

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:

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

Write true or false for the following statements:

Copper reacts vigorously with dilute HCl.