Chemistry Past Questions and Answers

The oxidation state of chlorine in potassium chlorate is

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;

When heat is absorbed during a chemical reaction, the reaction is said to be

When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as

The pH of four solutions W, X, Y, Z are 4, 6, 8, 10 respectively, therefore