Chemistry Past Questions and Answers

Two metallic ions associated with hard water are

Bronze is an alloy of

Phosphorus burns in oxygen according to the equation P<sub style='font-size: smaller;'>4</sub> + 50<sub style='font-size: smaller;'>2</sub> → P<sub style='font-size: smaller;'>4</sub>O<sub style='font-size: smaller;'>10</sub>. How many litres of oxygen will be required at S.T.P for complete oxidation of 12.4g of phosphorus? [P = 31,O = 16 and molar volume of a gas at S.T.P = 22.4 litres]

On heating anhydrous iron (ll) sulphate, in addition to producing iron (iii) oxide, which of the following is produced?

One of the following techniques can be used to show that chlorophyll pigment is a mixture of chemical compounds and not a single coloured compound