The salt that reacts with dilute hydrochloric acid to produce a pungent smelling gas which decolourizes acidified purple potassium tetraoxomanganate (VII) solution is

The refreshing and characteristic taste of soda water and other soft drinks is as a result of the presence of

Which of the following are mixtures? 
I. Petroleum 
II. Rubber latex 
III. Vulcanizer's solution 
IV. Carbon sulphide

A balanced chemical equation obeys the law of

When air which contains the gases Oxygen, nitrogen, carbondioxide, water vapour and the rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are;