Chemistry Past Questions and Answers

The decomposition of hydrogen peroxide is represented by the equation: 2H₂O_(l) + O_2(g) what mass of hydrogen peroxide would be required to produce 22.4dm₃ of oxygen at s.t.p? (H = 1, O = 16, molar volume of a gas at s.t.p. = 22.4dm₃)

Which of the following compounds crystallizes without water of crystallization?

The following metals are extracted by the electrolytic method except

Petrol can be obtained from diesel by

(a) Write the electronic configuration of an element with atomic number 15, indicating the distribution of electrons in the energy sub-levels
(b) Give the formula and the colour of the complex formed between ammonia and copper (II) ions