JAMB Chemistry 2014 Past Questions

A mixture is different from a compound because

What is the percentage of sulphur in sulphur (IV) oxide?

A gas X diffuses twice as fast as gas Y. if the relative molecular mass of X is 32, calculate the relative molecular mass of Y.

200 cm³ of a gas at 25^oC exerts a pressure of 700 mmHg. Calculate its pressure if its volume increase 350 cm³ at 75^oC.

An element X has electron configuration 1s² 2s² 2p⁶ 3s² 3p⁵. Which of the following statements is correct about the element?

Beryllium and aluminium have similar properties because they

If the difference in electronegativity of elements P and Q is 3.0. The bond that will be formed between them is

How many protons, neutrons and electrons respectively are present in the element 60/27 Co?

The radio active radiation used in studying the arrangement of particles in giant organic molecules is

A silicon -containing ore has 92% ²⁸Si, 5% ²⁹Si and 3% ³⁰Si. Calculate the relative atomic mass of the silicon.

The nitrogen obtained from air has a density higher than the one from nitrogen-containing compounds because the one from air is contaminated with

Water is said to be temporarily hard when it contains

On exposure to the atmosphere, a hydrated salt loses its water of crystallization to become anhydrous. This phenomenon is referred to as

16.55g of lead (ll) trioxonitrate (V) was dissolved in 100g of distilled water at 20^oC, calculate the solubility of the solute in moldm-³

[Pb = 207, N = 14, O = 16]

The dispersion of a liquid in a liquid medium will give

The major and most effective way of controlling pollution is to

The basicity of CH₃COOH is

The colour of litmus in a neutral medium is

The mathematical expression of PH is

Which of the following salts will turn blue litmus red?

Zn _(s) + CuSO ₄(aq) → ZnSO ₄(aq) + Cu _(s)
In the reaction above, the oxidation number of the reducing agent changes from

H ₂O _(g) + C _(s) → H_2(g) + CO_(g)

The oxidizing agent in the reaction above is

Calculate the quantity of electricity in coulombs required to liberate 10g of copper from a copper compound

[Cu=64, F = 96500 Cmol^-1]

How many faraday of electricity is required to produce 0.25 mole of copper?

If the change in free energy of a system is -899 Jmol^-1 and the entropy change is 10Jmol^-1k^-1 at 250C, calculate the enthalpy change.

In an equilibrium reaction, which of the following conditions indicates that maximum yield of the product will be obtained?

In a chemical reaction, the change in concentration of a reactant with time is

Cr ₂O\(\frac{2 -}{7}\) (aq) + H ₂O(1)⇌ 2CrO \(\frac{2 -}{4}\) (aq) + 2H ⁺ (aq)

What happens to the reaction above when the hydrogen ion concentration is increased?

Which of the following will shift to the left from dilute tetraoxosulphate (VI) acid?

The gas that is removed by the water in the flask is

Fluorine does not occur in the free state in nature because

In the extraction of sodium from fused sodium chloride, the anode is made of platinum because

In the electrolytic extraction of cacium from calcium chloride, the cathode is

A compound that gives a brick-red colour to a non-luminous flame is likely to contain

A few drops of NaOH solution was added to an unknown salt forming a white precipitate which is insoluble in excess solution. The cation likely present is

The general formula of haloalkanes where X represents the halide is

The alkanol obtained from the production of soap is

Ethyne is passed through a hot tube containing organo-nickel catalyst to produce

Due to the unstable nature of ethyne, it is stored by dissolving in

The process of converting starch to ethanol is

The polymer used in making car rear lights is

CH₃COOC₂H₅(1) + H₂O₍₁₎ ⇌ CH ₃COOH _(aq) + C ₂H ₅OH _(aq)

The purpose of H⁺ in the reaction above is to

A hydrocarbon has an empirical formula CH and a vapour density of 39. Determine its molecular formula.

[C = 12, H = 1]

Polystyrene is widely used as packaging materials for fragile objects during transportation because of its

The process of converting linear alkanes to branched chain and cyclic hydrocarbons by heating in the presence of a catalyst to improve the quality of petrol is referred to as

The petroleum fraction that is used in heating furnaces in industries is

The IUPAC nomenclature of the compound above is

In the diagram, the function of the concentrated H₂SO₄ is to

The gas that is removed by the water in the flask is

Z in diagram above represents