Chemistry

Problem

Ferric sulphate on heating gives sulphur trioxide. The ratio between the weights of oxygen and sulphur present in

SO_3

obtained by heating 1 kg of ferric sulphate is 2 : 3 1 : 3 3 : 1 3 : 2 a. 2 : 3 b. 1 : 3 c. 3 : 1 d. 3 : 2