Write true or false for the following statements:

A solution of an ionic compound in water contains ions, which move to the opposite electrodes when electricity is passed through the solution.

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.

Write true or false for the following statements:

The elements or compounds, which occur naturally in the earth’s crust, are known as minerals.

Write true or false for the following statements:

Those minerals which contain a very high percentage of a particular metal and from which metal can be profitably extracted are called ores.