JAMB Chemistry 2003 Past Questions

What volume of oxygen is produced from the decomposition of 2 mole of KCIO₃ at s.t.p?
[Molar volume of a gas at s.t.p = 22.4 dm³]

Which of the following is physical change?

What is the percentage by mass of oxygen in Al₂(SO₄)₃. 2H₂O?
[Al = 27, S = 32, H = 1, O = 16]

The filter in the cigarette reduces the nicotine content by

3Cu + pHNO₃ →3Cu(NO)₂ + 4H₂ O + xNO
In the equation above, the values of p and x respectively are

Neutral atoms of neon with atomic number 10 have the same number of electron as

The noble gases owe their inactivity to

According to the kinetic theory, an increase in temperature causes the kinetic energy of particles to

I. H = 1s¹ II. N = 1s² 2s² p³ III. O = 1s² 2s² p⁴ IV. Zn = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰
From the above, which of the following pairs is like to be paramagnetic?

A gas exerts pressure on its container because

When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes

The weakest attractive force that can be observed between two molecules is

A consequence of global warming is

Which of the following ions is acidic?

The structural component that makes detergent dissolve more quickly in water than soap is

A liquid that will dissolve fat is

What mass of K₂CrO₄ is required to prepare 250cm³ of 0.020 mol dm³ solution?
[K₂CrO₄ = 194.2g mol^-1]

Farmlands affected by crude-oil spillage can be decontaminated by

When 10g of sodium hydroxide is dissolved in 1000cm³ of water, the sodium formed is approximately
[Na = 23, H = 1, O = 16]

A change in temperature of a saturated solution disturb the equilibrium between the

If an equilibrium reaction has ΔH > 0, the reaction will proceed favourably in the forward direction at

The commonest feature of reactions at the anode is that

Which of the following will change when a catalyst is added to a chemical reaction?

If y is an oxidizing agent that reacts with a reducing agent, Z, which of the following is correct?

When at equilibrium, which of the reactions below will shift to the right if the pressure is increased and the temperature is kept constant?

In the electrolysis of a concentrated solution of sodium chloride using electrodes, which of the following ions are discharged at the cathode and anode respectively?

CO_(g) + H₂O_(g) → CO_2(g) + H_2(g)
From the reaction above, calculate the standard enthalpies of formation of CO_2(g), H₂O_(g) and CO_(g) in kJ mol^-1 are -394, -242, and -110 respectively.

When sugar is dissolved in tea, the reaction is always accomplished by

Which of the following is an electrolyte?

Chlorine gas is prepared in the laboratory by

Metals of the first transition series have special properties which are different from those of groups I and II elements because they have partially filled

Hydrogen can be displaced from a hot alkaline solution by

Which of the following statements is true of sulphur (IV) oxide?

The salt that will form a precipitate soluble in excess ammonia solution is

The metal that liberates hydrogen from cold water in bubbles only is

Chlorine gas turns a damp starch-iodide paper

The modern process of manufacturing steel for iron is by

Ethene reacts with hydrogen bromide to give

How many isomers does pentane have?

The leachate of a certain plant ash is used in local soap making because it contains

The formula for ethyl butanoate is

The type of reaction that is peculiar to benzene is

Ethanol reacts with excess acidified K₂Cr₂O to produce

A compound contains 40.0% carbon 6.7% hydrogen and 53.3% oxygen. If the molar mass of the compound is 180, find the molecular formula.
[H = 1, C = 12, O = 16]

The process by which atoms are rearranged into different molecular structure in the petroleum refining process is referred to as

Which of the following is found in cotton

The principal constituent of natural gas is

2HCI_(ag) + CaCO_{3(s) → CaCl2(s) + CO 2(g) +H2O(1) From the reaction above, which of the curves in the diagram represents the production of carbon (IV) oxide as dilute HCI is added?}