2015 - JAMB Chemistry Past Questions and Answers - page 1

Nicotine is a substance in cigarette which makes difficult to make one stop smoking. This can be derived by burning. Options B,C,D will not reduce this nicotine

Crystallization is required the most in industries where the purity of their products is important e.g in the manufacture of drugs and in sugar production. Options B,C and D do not undergo crystallization

Iron is galvanized with zinc covering to protect it against corrosion. Option A, B, D are the main reasons iron is galvanized

Washing under pressure is an action in the industrial production of H. Options B,C,D will not yield Co and H

The ozone layer or ozone shield refers to a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet (UV) radiation. It contains high concentrations of ozone (O3) relative to other parts of the atmosphere, although still very small relative to other gases in the stratosphere

Vulcanizer is the removal of double bend in a chemical reaction. Option A,B,D can not be removed by vulcanizer

HeSO₄ is the acid used in the electrolysis of water. Option A,B,D are concentrated acid and they will react with the water

Sublimation is the transformation of solid gaseous state without passing through the liquid state. Options A,C,D do not show case these character of sublimation as they do not bye pass states. They are in a particular order

Efflorescence is a process of long exposure to the atmosphere which favors salt loss of water. Options B, C, D are not related to loss of water

The atomicity of a molecule refers to the number of atoms present in one molecule of the substance. Ozone has the chemical formula O3, which means it is composed of three oxygen atoms.