The following data are obtained when dinitrogen and dioxygen react together to form different compounds:

The given data is in accordance with the law of multiple proportions, which states : When two elements combine to from two or more than two compounds, the weight of one of the two elements which combines with the fixed weight of the other, bears a simple ratio to one another,In the said question, if we fix the weight of dinitrogen at 14 g, then the weights of dioxygen which combines with the fixed weight (= 14 g) of dinitrogen will be 16,32,16,40 which are in the simple whole number ratio of 1:2:1:25 or 2:4:2: 5.

(ii) (a) 1 kg = ${{10}^{6}}$ mm = ${{10}^{15}}$ pm

(b) 1 mg = ${{10}^{-6}}$ kg = ${{10}^{6}}$ ng.

© 1mL = 1 m+L/1000mL=${{10}^{-3}}$L