JAMB Chemistry 2000 Past Questions

A mixture of iodine and sulphur crystals can be separated by treatment with

Sieving is a technique used to separate mixture containing solid particles of

Which of the following compounds is composed of Al, Si, O and H?

50 cm³ of carbon (II) oxide was exploded with 150 cm³ of air containing 20% oxygen by volume. Which of the reactants was in excess?

The ratio of the initial to final pressure of a given mass of gas is 1:1.5. Calculate the final volume of the gas if the initial volume was 300 cm³ at the same temperature

The partial pressure of oxygen in a sample of air is 452 mm Hg and the total pressure is 780 mm Hg. What is the mole fraction of oxygen?

The fundamental difference between the three states of matter is the

Which of the following statement is correct about the periodic table?

The electron configuration of ₂₂X ²⁺ ion is

Which of the following types of bonding does not involve the formation of new substance?

The knowledge of half-life can be used to

The shapes of CO₂, H₂O and CH ₄ respectively are

The distance between the nuclei of chlorine atoms in a chlorine molecule is 0.194 mm. The atomic radius of chlorine atom is

The noble gas, argon,is used for

A side effect of soft water is that

Water molecule can be ligands especially when they are bonded to

The air pollutant unknown in nature is

1.0 dm³ of distilled water was used to wash 2.0g of a precipitate of AgCl. If the solubility product of AgCl is 2.0 * 10^-10mol²dm^-6, what quantity of silver was lost in the process?

Hydration of ions in solution is associated with

HCL_(aq) + H₂O_(l) H₃O⁺_(aq) + Cl^-_(aq)
In the reaction above, Cl^-_(aq) is the

In which order are the following salts sensitive to light?

The pOH of a solution of 0.25 mol dm^-3 of hydrochloric acid is

MnO_4(aq) + 8H⁺_(aq) + Y → Mn²⁺_(aq) + 4H₂O_(l)
Y in the equation above represents

(1/2)Zn²⁺_(aq) + e^- → (1/2) Zn_(s)
In the reaction above, calculate the quantity of electricity required to discharge zinc.
[F = 96 500 C mol^-1]

Given that M is the mass of substance deposited in an electrolysis and Q the quantity of electricity consumed, then Faraday's law can be written as

0.46g of ethanol when burned raised the temperature of 50g of water by 14.3K. Calculate the heat of combustion of ethanol.
[C = 12, O = 16, H = 1, Specific heat capacity of water = 4.2 jg^-1K^-1]

Powdered marble reacts faster with hydrochloric acid solution than the granular form because the powdered form has

N_2(g) + O_2(g) ↔ 2NO_(g); ΔH = + 180.6 kJ mol^-1
In the reaction above, increase in temperature will

For a reaction in equilibrium, the species involved in the equilibrium constant expression are

A phenomenon where an element exist in different forms in the same physical state is known as

The substance often use for vulcanization of rubber is

A gas that is not associated with global warming is

The refreshing and characteristic taste of soda water and other soft drinks is as a result of the presence in them of

A form of carbon used for absorbing poisonous gases and purification of noble gases is

Synthesis gas is a mixture of

Potassium vapour burns with a

A common characteristics of copper and silver in their usage as coinage metals is that they

Haematite is an ore of

The least easily oxidized of the metals below is

The repeating unit in natural rubber is

Unsaturated organic compounds are identified by decolourization of

The conditions necessary for the extraction of a water molecule from two molecules of ethanol are

The chlorinated alkane often used industrially to remove grease is

The reaction of carbide with water gives

Alkanones are generally obtained by the oxidation of

Sucrose is made up of

The diagram above is the solubility curve of a solute, X. Find the amount of X deposited when 500cm³ of a solution of X is cooled from 60^oC to 20^oC.

Use the option above to answer this question. The graph that describes a zero order reaction is

The compound above is an