Describe briefly about the formation of coal.

Name four types of coal with the percentage of carbon present in each.

The acid used in the laboratory preparation of carbon dioxide gas is:

1. dil. hydrochloric acid
2. conc. sulphuric acid
3. dil. sulphuric acid
4. conc. hydrochloric acid

The metal which burns in carbon dioxide is:

1. Iron
2. Magnesium
3. Aluminium
4. Copper