JAMB Chemistry 2001 Past Questions

25cm³ of a gas X contains Z molecules at 15^oC and 75 mmHg. How many molecules will 25 cm³ of another gas Y contain at the same temperature and pressure?

What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen?
[H = 1, O = 16]

A particle that contains 9 protons, 10 neutrons and 10 electrons is a

Cancerous growths are cured by exposure to

An oxide XO₂ has a vapour density of 32. What is the atomic mass of X?

Millikan's contributions to the development of atomic theory is the determination of

Four elements W, X, Y and Z have atomic number 2,6,16 and 20 respectively. Which of these elements is a metal?

An elements X with relative atomic mass 16.2 contains two isotopes ¹⁶₈X with relative abundance of 90% and ^m₈X with relative abundance of 10%. The value of m is

Which of the following statements is correct about the average kinetic energy of the molecules of a gas?

The pollution from petroleum spillage in rivers and lakes can best be dispersed by

Deliquescent substance are used for

Pure solvents are obtained by

What is the decrease in volume of air when pyrogallol is shaken with 30.00cm³ of air ?

Environmental pollution is worsened by the release from automobile exhausts of

The chemical used for coagulation in water purification is

Phosphorus is stored under water to prevent it from

In which of the following reactions does reduction takes place

P_(g) + Q_(g) ↔ 3R_(s) + S_(g) ΔH is negative
Which of the following will increase the yield of R?

A metal M displaces zinc from zinc chloride solution. This shows that

Which of the following best explains the increase in the rate of a chemical reaction as the temperature rises?

What current in amperes will deposit 2.7g of aluminium in 2 hours?
[Al = 27, F = 96 500 C mol^-1]

Ethanoic acid is

C_(s) + 2S_(g) → CS_2(g)
ΔH = +89 kJ mol^-1
The chemical equation above implies that

2SO_2(g) + O_2(g) ↔ 2SO_3(g)
ΔH = -189 kJ mol^-1
The equilibrium constant for the reaction above is increased by

3Cu_(s) + 8HNO_3(aq) 3Cu(NO₃)_2(aq) + 4H₂O_(l) + 2NO_(g)
In the equation above, copper is

When ΔH is negative, a reaction is said to be

As the concentration of an electrolyte reduces, the conductivity

In which of the following reactions has the oxidation number of nitrogen increased?

NH_3(g) + HCl_(g) → NH₄Cl_(s)
The entropy change in the system above is

Fermentation is the

The general formula for the alkanals is

The main impurity in iron ore during the extraction of iron is

During the vulcanization of rubber, sulphur is added to

Catalytic hydrogenation of benzene produces

A trihydric alkanol is

When chlorine Is passed into water and the resulting solution exposed to sunlight, the product formed are

Proteins in acid solution undergo

A characteristic reaction of the compounds with the general formula C_nH_2n is

The pair of organic compounds that are isomers is

A burning candle produces water and

The gas that can best be collected by downward displacement of air is

Which of the following metals burn with brick red flame?

Which of the following represent hybridization in ethyne?

C₁₂H₂₂O_11(s) + H₂SO_4(aq) 12C_(s) + 11H₂O_(l) + H₂SO_4(aq)
In the reaction above, tetraoxosulphate (VI) acid function as

When sodium reacts with water, the resulting solution is

Which of the following gases contains the least number of atoms at s.t.p?

Use the graph above to answer this question.If the gas is cooled, at what temperature will it start to condense?

Use the graph above to answer this question.How long does it take all the solid to melt?`

The diagram above represents the formation of

Use the solubility curves below to answer questions. If 1 dm³ of a saturated solution of L at 60⁰C is cooled to 25⁰C, what amount in mole will separate out?