JAMB Chemistry 1980 Past Questions

In an attempt to remove sugar from a breaker containing a quantity of sand and sugar, 2 M ammonium chloride solution was accidentally added instead of water. Which of the following method could be used to remove the ammonium chloride from the mixture?

The alloy duralumin is used for the building of aeroplanes because it?

A solution X on mixing with AgNO₃ solution, gives a white precipitate solution in NH₃. A Solution Y, when added to X, also gives a white precipiate which is soluble on boiling. Solution Y contains?

10cm³ of CO is mixed and sparked with 100cm³ of air containing 21% O₂. If all the volumes measured at S.T.P. the volume of resulting gases would be?

A sample of an oxide of mercury weighed 1.00g. When this was heated, oxygen was given off, and 1.00g of mercury metal only was left. What is the formula of the oxide?

On heating, under suitable conditions, 1 litres of monoatomic gas,X, combines with 1¹/₂ litres of an oxide, What is the formula of the oxide.

If 1 litre of 2.2M sulphuric acid is poured into a bucket containing 10 litre of water,and resulting solution mixed thoroughly, the resulting sulpuric acid concentration will be?

Which of the following reactions is correct as as written?

Under high pressure, real gases do not obey gas laws because their molecules?

How many grams of hydrogen gas will be liberated when 6g of magnesium ribbon dissolves in 500cm³ of 6M HCl?


(Mg=24, H=1, Cl=35.5)

Which of the following statements is an exception in the assumptions of the kinetic theory of gases?

Which of the following statements is true?

The boiling point of water is higher than that of methanol because?

Chlorine, bromine and iodine resemble each other in that all?

Element X has a total of 19 electrons and can react with oxygen to form an oxide. Which of the following statements is NOT true of the oxide of the element?

Which ONE of the following statements is true?

When ethene gas reacts with chlorine gas to form 1, 2-dichloroethene, the reaction is called?

20 cm³ of 1 M H₂SO₄ is mixed 20 cm³ of 1 M NaOH. The resulting solution is?

Which of the following is acceptable as the organic product of the reaction of ethanoic acid and ethanol with an acid catalyst?

Given the mean atomic mass of chlorine prepared in the laboratory to be 35.5 and assuming that chlorine contains two isotopes of mass number 35 nad 37, what is the percentage composition of the isotope of mass number 35?

When dilute hydrochloric acid is added to iron(ll)sulphide, the gas evolved will?

In which of the following is the oxidation state of oxygen different from its value in water?

Which of the following silver halides is readily soluble in ammonium hydroxide?

The chemical reaction which takes place at the anode (positive electrode) in electrolysis is?

Which of the following does NOT happen when a zinc rod is introduced into a solution of copper (ll) sulphate?

Hardening of an oil may be achieved by?

Hardening of an oil may achieved by?

A cold aqueous solution of sodium chloride is electrolyzed using a graphite anode and an iron cathode. In the course of the electrolysis the electrolyte is continuously stirred. The liquid left after electrolysis will therefore consist of?

The best way of collecting chlorine is?

Cellulose and starches can be classified as one of the following?

If one of the following oxides is heated with hydrogen or carbon using a bunsen burner, it is not reduced to the metal. Which one is it?

Which of the following statement is false?

A mixture of ethanol, sodium dichromate, and water is allowed to drop gradually into a boiling solution containing one part concentrated H₂SO
₄ and the liberate gas is collected by cooling it with ice water to give a liquid. This liquid is?

When chlorine gas is passed into a solution of sulphur dioxide?

In the above experiment X is

The IUPAC name for the compound is

Which of the following compounds will take up the molecules of bromine?

Which of the following is the correct order in the above diagram increasing boiling point, of the isomeric C ₅H₁₂ compounds?

The following graph demonstrates the rate of reaction between calcium carbonate (marble)and dilute hydrochloric acid. The graph shows that the rate of reaction is initially greatest when

Copper sulphate solution was electrolysed using the apparatus show above. Which of the following changes are observed?

The following arrangement of elements in order of decreasing number of outer electrons; One of the elements is wrongly placed. Which is it? ALUMINIUM, CHLORINE, SILICON, MAGNESIUM AND SODIUM.

Which of the following tests would confirm-unequivocally that a solution X contain the sulphate ion if it gives with

When copper (ii) sulphate solution is treated with excess ammonium hydroxide, a precipitate is first formed, and then this dissolves to give a deep blue solution. This deep blue solution is a

Which of the following derivatives of nitrogen affords an aqueous solution having a pH of less that 7?

Detergents are more advantageous than soaps in hard water districts because

Which of the following classes of organic compounds undergoes rapid oxidation with bromine water?

An endothermic reaction is one during which heat is.....and can be represented by the symbol.... which of the following combinations can be used accurately to complete the above definition?