JAMB Chemistry 1987 Past Questions

The reaction between sulphur (IV) oxide and oxygen is represented by the equilibrium reaction 2SO_2(g) + O_2(g) ↔ 2SO_3(g), ∆H = -196 kJ. What factor would influence increased production of SO_3(g)?

Magnesium ribbon was allowed to burn inside a given gas P leaving a white solid residue Q. Addition of water to Q liberated a gas which produced dense white fumes with a drop of hydrochloric acid. The gas P was?

The best treatment for a student who accidentally poured concentrated tetraoxosulphate (VI) acid on his skin in the laboratory is to wash the skin with?

In which of the following pairs of element is allotropy exhibited by each element?

Which of the following gases can best be used for demonstrating the fountain experiment?
i) Nitrogen (ii) Ammonia (iii) Nitrogen (I) oxide
(iv) Hydrogen chloride.

When sodium hydroxide is heated with ammonium tetraoxosulphate (IV), the gas given off may be collected by?

Which of the following elements will form oxide which will dissolve both in dilute HNO₃ and NaOH solutions to form salts?

Stainless steel is an alloy of?

Alloys are best prepared by?

Corrosion is exhibited by?

Inspite of the electronic configuration, 1s²2s²2p², carbon is tetraavalent because?

Which of the following compounds will give a precipitate with an aqueous ammoniacal solution of copper (l) chloride?

The efficiency of petrol as a fuel in high-compression internal combustion engines improves with an increase in the amount of?

Ethanol reacts with aqueous sodium mono-oxoio date (l) to give a bright yellow solid with a characteristic smell. The product is?

The most volatile fraction obtained from fractional distillation of crude petroleum contains?

Local black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the?

Synthetic rubber is made by polymerization of?

Complete oxidation of propan -1- ol gives?

When water drops are added to calcium carbide in a container and the gas is passed through a jet and lifted, the resultant flame is called an?

The greater the different in electronegativity between bonded atoms, the?

A stream of air was successively passed through three tubes X, Y and Z containing a concentrated aqueous solution of KOH, red hot copper powder and fused calcium chloride respectively. What was the composition of the gas emanating from tube Z?

In the purification of town water supply, alum is used principally to?

Which of the following water samples will have the highest titre value when titrated for the Ca²⁺ ions using soap solution?

Oil spillage in ponds and creeks can be cleaned up by?

The solubility of Na₃AsO₄(H₂O)₁₂ is 38.9g per 100g H₂O. What is the mass percentage of Na₃AsO₄ in the saturated solution?

(As = 75, Na = 23, O = 16, H = 1)

In which of the following are the aqueous solutions of each of the substances correctly arranged in order to decreasing acidity?

If 24.83 cm³ of 0.15 M NaOH is titrated to its end point with 39.45 cm³
of HCl, what is the molarity of the HCl?

The atomic numbers of two elements X and Y are 12 and 19 respectively. The bond of these two elements is?

If d represents the density of a gas and K is a constant, the rate of gaseous diffusion r is related to d by the equation?

An isotope has an atomic number of 17 and a mass number of 36. Which of the following gives the correct number of neutrons and protons in an atom of the isotope?

An element Z, contained 90% of ¹⁶₈Z and 10% of Z¹⁸₁₈ its relative atomic mass is?

Use the option above to answer this question. Which is the correct set of results for tests conducted respectively on fresh lime juice and ethanol.

The times taken for iodine to be liberated in the reaction between sodium thiosulphate and hydrochloric acid at various temperature are as follows. These results suggest that

Use the option above to answer this question. The structure of benzoic acid is