JAMB Chemistry 2013 Past Questions: Practice Test with Answers

What volume of carbon(II) oxide is produced by reacting excess carbon with 10 dm³ of oxygen?

From the diagram above, an ideal gas is represented by

The rate of diffusion of a gas Y is twice that of Z. If the relative molecular mass of Y is 64 and the two gases diffuse under the same conditions, find the relative molecular mass of Z.

The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is

How many unpaired electrons are in the p-orbitals of a fluorine atom?

The radioactive emission with the least ionization power is

The shape of the carbon(IV) oxide (CO₂) molecule is

Which of the following molecules is held together by hydrogen bond?

The bond formed between two elements with electron configurations 1s² 2s² 2p⁶ 3s² and 1s² 2s² 2p⁴ is

The constituent of air that acts as a diluent is

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

An example of a hygroscopic substance is

If 24.4 g of lead(II) trioxonitrate(V) were dissolved in 42 g of distilled water at 20 °C, calculate the solubility of the solute in g dm⁻³.

The solvent used for removing grease stain is

In a water body, too much sewage leads to

10.0 dm³ of water was added to 2.0 mol dm⁻³ of a 2.5 dm³ solution of HCl. What is the concentration of the final solution (mol dm⁻³)?

Three drops of a 1.0 mol dm⁻³ solution of HCl were added to 20 cm³ of a solution of pH 6.4. The pH of the resulting solution will be

Which of the following substances is not a salt?

An insoluble salt can be prepared by

2H₂O(l) + 2F₂(g) → 4HF(aq) + O₂(g). In the reaction above, the substance that is being reduced is

Zn(s) + CuSO₄(aq) → ZnSO₄(aq) + Cu(s). In the reaction above, the oxidizing agent is

In an electrochemical cell, polarization is caused by

Calculate the volume in cm³ of oxygen evolved at s.t.p. when a current of 5 A is passed through acidified water for 193 s. {F = 96500 C mol⁻¹, molar volume at s.t.p. = 22.4 dm³}

In an endothermic reaction, if there is a loss in entropy the reaction will

2SO₂(g) + O₂(g) ⇄ 2SO₃(g), ΔH = −395.7 kJ mol⁻¹. In the reaction above, the concentration of SO₃(g) can be increased by

The minimum amount of energy required for a reaction to take place is

In the graph above, the activation energy of the catalyzed reaction is

3Fe(s) + 4H₂O(g) ⇄ Fe₃O₄(s) + 4H₂(g). The equilibrium constant, K, of the reaction above is represented as

Which of the following compounds is a neutral oxide?

In the laboratory preparation of ammonia, the flask is placed in a slanting position so as to

Which of the gases is employed as an anaesthesia?

Sulphur(IV) oxide is a strong reducing agent in the presence of water due to the formation of

A metal that forms soluble trioxosulphate(IV) ion is

Copper is displaced from the solution of its salts by most metals because it

The coloured nature of transition metal ions is associated with their partially filled

Aluminium containers are frequently used to transport trioxonitrate(V) acid because aluminium

2-methylbutan-2-ol is an example of a

The reaction between ammonia and ethyl ethanoate produces

The decarboxylation of ethanoic acid will produce carbon(IV) oxide and

The compound above is an

The compound that will react with sodium hydroxide to form salt and water is

Which of the following compounds in solution will turn red litmus paper blue?

The dehydration of ammonium salt of alkanoic acids produces a compound with the general formula

Which of the following fractions is used as raw material for the cracking process?

An organic compound with a pleasant smell is likely to have a general formula

A primary amide is generally represented by the formula

The IUPAC nomenclature for the compound above is

An organic compound contains 60% carbon, 13.3% hydrogen and 26.7% oxygen. Calculate the empirical formula. (C=12, H=1, O=16)