Write the formulae of the following compounds. Also name the elements present in them.

(a) Water

(b) Ammonia

(c) Methane

(d) Sulphur dioxide

(e) Ethanol.

(a) Water- H2O; As conveyed by the formula, elements present are hydrogen and oxygen.

(b) Ammonia-NH3; As conveyed by the formula, elements present are nitrogen and hydrogen.

(c) Methane-Ch4; As conveyed by the formula, elements present are carbon and hydrogen.

(d) Sulphur dioxide-SO2; As conveyed by the formula, elements present are sulphur and oxygen.

(e) Ethanol-C2H5OH; As conveyed by the formula, elements present are carbon, hydrogen and oxygen.