JAMB Chemistry 2002 Past Questions

A compound contains 31.91% potassium, 28.93% chlorine and the rest oxygen. What is the chemical formula of the compound?
[K = 39, Cl = 35.5, O = 16]

The formula CH₂ for ethanoic acid is regarded as its

A little quantity of trichloromethane (b.pt 60,^oC) was added to a large quantity of ethanol (b.pt 78,^oC). The most probable boiling point of the resultant mixture is from

The chromatography separation of ink is based on the ability of the components to

In the reaction E+F ↔ G+H, the backward reaction is favoured if the concentration of

What amount of mercury would be liberated if the same quantity of electricity that liberates 0.65g of zinc is applied?

Which of the following equations show that a reaction is in equilibrium?

PCl_5(g) ↔ PCl_3(g) + Cl_2(g)
In the reaction above, a decrease in pressure will

When H₂S is passed into a solution of iron (III) chloride, the solution turns

The Arrhenius equation expresses the relationship between the speed of a reaction and its

When dissolved in water, NaOH flakes show

CU₂S_(s) + O_2(g) → 2CU_(s) + SO_2(g)
What is the change in the oxidation number of copper in the reaction above?

The product of the electrolysis of dilute sodium hydroxide using platinum electrodes are

The solubility of a salt of molar mass 101g at 20^oC is 0.34 mol dm^-3. If 3.40g of the salt is dissolved completely in 250cm³ of water in a beaker, the resulting solution is

Tetraoxosulphate (VI) acid burns the skin by

When a salt loses its water of crystallization to the atmosphere on exposure, the process is said to be

Three drops of a 1.0 mol dm^-3 solution of NaOH are added to 20 cm³ of a solution of pH 8.4. The pH of the resulting solution will be

25cm³ of a 0.2 mol dm³ solution of Na₂CO₃ requires 20 cm³ of a solution of HCl for neutralization. The concentration of the HCl solution is

The substance least considered as a source of environmental pollution is

The fuming of kettles is caused by the presence in the water of

The property which makes alcohol soluble in water is the

Steam changes the colour of anhydrous cobalt (II) chloride from

The gas that gives brown colouration in brown ring test is

Ethanol can easily be produced by

Which of the following gives a precipitate when treated with NaOH solution?

An example of element that can catenate is

The reaction of an alkene with hydrogen in the presence of catalyst is

The number of isomers formed by C₆H₁₄ is

Which of these pairs are synthetic and natural macromolecules respectively?

Ordinary glass is manufactured from silica, CaCO₃ and

A red precipitate of copper (I) carbide is formed when ammonium solution of copper (I) chloride is introduced into

The boiling of fat and aqueous caustic soda is referred to as

The most important use of hydrogen is in the

which of the following polymers is suitable for packaging and electrical insulation?

Hydrogen is readily released when dilute hydrochloric acid reacts with

The intermediate product formed when ethanol is progressively oxidized to ethanoic acid with potassium heptaoxodichromate (IV) is

A rock sample was added to cold dilute HNO₃. The gas evolved was passed into a solution of acidified K₂Cr₂O₇ and the solution turned green. The sample contains

Which of the following statement is true of a proton?

Which of the following chloride would exhibit the least ionic character?

A fixed mass of gas has a volume of 92cm₃ at 3 ^oC. When will be its volume at 18 ^oC if the pressure remains constant

The processes which return carbon (IV) oxide to the atmosphere include

The postulate of Dalton's atomic theory which still holds is that

¹⁴₆C → X + B
X in the equation above represents

If 0.75 mole of cyclopropane and 0.66 mole of oxygen are mixed in vessel with a total pressure of 0.7 atmosphere, what is the partial pressure of oxygen in the mixture

In the diagram above, the curve that represents the production of oxgyen gas from the decomposition of KCIO₃ in the presence of MnO₂ catalyst is

The major product of the dehydration of the compound above is

The compound above is