JAMB Chemistry 1986 Past Questions

Which of the following salts when dissolved in water will NOT give the corresponding pH value?

Which of the following is an acidic salt?

Which of the following solutions will conduct the least amount of electricity?

How many coulombs of electricity are passed through a solution in which 6.5 amperes are allowed to run for 1.0 hour?

Which of these represents a redox reaction?

20 cm³ of 1.0 molar NH₄OH solution when neutralized with 20.05cm³ of 0.1 molar HCl liberated -102 joules of heat. Calculate the heat of neutralization of NH₄OH?

What is the consequences of increasing pressure on the equilibrium reaction ZnO_(s) + H_2(g) Zn_(s) + H₂O_(I)?

The approximate volume of air containing 10cm³ of oxygen is?

The reaction Mg + H₂O → MgO + H₂ takes place only in the presence of?

When steam is passed through red hot carbon, which of the following are produced?

The exhaust fumes from a garage in a place that uses petrol of high sulphur content are bound to contain?

Oxygen-demanding waste are considered to be a water pollutant because they?

Which of the following will react further with oxygen to form higher oxide?

In the course of an experiment, two gases X and Y were produced. X turned wet lead ethanoate to black and Y bleached moist litmus paper. What are the element(s) in each of the gases X and Y respectively?

Which of the following metals does NOT form a stable trioxocarbonate (IV)?

Which of the following sulphides is insoluble in dilute HCl?

When chlorine is passed into water and subsequently exposed to sunlight, the gas evolved is?

A substance Z reacts with NaOH to give salt and water only. When Z is treated with dilute HCl, a gas is evolved which gives a yellow suspension on passing into concentrated H₂SO₄. Substance Z is?

Ammonia gas is normally dried with?

What are the values of x, y and z respectively in the equation: xCu + yHNO₃ → xCu(NO₃)₂ + 4H₂O + zNO?

The iron (III) oxide impurity in bauxite can be removed by?

Which of the following does NOT contain aluminium as component?

A white solid suspected to be lead trioxonitrate (V) zinc trioxocarbonate (IV) or calcium trioxocabonate (IV) was heated strongly. Its residue which was yellow when hot and white when cold is?

Which of the following compounds would give lilac flame coloration and a white precipitate with acidified barium chloride solution?

How will a metal X, which reacts explosively with air and with dilute acids be best extracted from its ores?

Which of the following is NOT correct test for the named organic compound in each case?

Which of the following is used as an 'anti-knock' in automobile engines?

What reaction takes place when palm-oil is added to potash and foam are observed?

When ethanol is heated with excess concentrated sulphuric acid, the ethanol is?

Which of the following compounds is NOT formed by the action of chlorine on methane?

Which of the following substance is a mixture?

The general formula of an alkyl halide (where X represents the halide) is?

Which of the following are made by the process of polymerization?

Starch can be converted to ethyl alcohol by?

The movement of liquid molecules from the surface of the liquid to the gaseous phase above it is known as?

What mass of a divalent metal M (atomic mass = 40) would react with excess hydrogen gas measured at S.T.P?

In the solubility curve above, water at 98^oC is saturated with KCL and KCIO ₃ What is the percentage of KCL impurity in the crystals formed when the solution is cooled to 30 ^oC?

In the electrolysis of aqueous solution of K₂SO ₄ in the above cell, which species migrate to the anode?

The tabulated results below were obtained by titration 10.0 cm₃ of water with soup. The titration was repeated with the same sample of water after boiling. The ratio of permanent to temporary hardness is

Use the options above to answer this question. Which is the structural formula for pent-2-enoic acid?

10cm³ of hydrogen fluoride gas react with 5cm³ of dinitrogen difluoride gas (N²F₂) to form 10₃ of a single gas. Which of the following is the most likely equation of the reaction?

The number of atoms of chlorine present in 5.85g of NaCl is [Avogaro's Number = 6.02 x 10²³]

How much of magnesium is required to react with 260cm³ of 0.5 M HCl? [Mg = 24]

The relationship between the velocity (U) of gas molecules and their relative molecular mass (M) is shown by the equation

An element with atomic number twelve is likely to be

Which of the following groups of physical properties increases from left to right of the periodic table? i. Ionization energy ii. Atomic radius iii. Electronegativity iv. Electro affinity

When 50cm³ of a saturated solution of sugar (molar mass 342.0g) at 40^oC was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40^oC is