When Sulphur(IV)oxide is passed into solution of acidified tetraoxomanganate(VII), the colour changes from 

Water gas obtained from the gasification of coke is made up of 

Sulphur(IV)oxide can be used as a

The molecular formular of a hydrocarbon with an empirical formula of CH\(_3\)  and a molar mass of 30 is 

The difference in molecular mass between an alkene and alkyne with six carbon per mole is