JAMB Chemistry 2008 Past Questions

Chlorophyll obtained from given leaves of plant can be shown to be composed of more than one coloured component by the technique of

In countries where the temperature falls below 273K, salt is always sprinkled on the icy road in order to

2Na_(s) + 2H₂O_(l) → 2NaOH_(aq) + H_2(g)
From the equation above, calculate the mass of sodium hydroxide produced by 2.3g of sodium.
[H = 1, O = 16, Na = 23]

16.8 g of sodium hydrogen trioxocarbonate (IV) is completely decomposed by heat. Calculate the volume of carbon(IV) oxide given off s.t.p
[Na 23, C = 12, O = 16, H = 1, Molar volume of a gas at s.t.p = 22.4 dm³]

300 cm³ of gas has a pressure of 800 mmHg. If the pressure is reduced to 650 mmHg, find its volume

Diffusion is slowest in solid particles than in particles of liquid and gases because

The experiment that showed that atoms have tiny positively charged nucleus was first carried out by

The atom of an element X is represented as _z^yX. The basic chemical properties of X depends on the value of

The diagram above represent the electron sub-level for

In the periodic table, the electrical and thermal conductivities are properties of elements that

\( _{11} ^{11}Na + _0^1n → _{11}^{24}Na \)
The reaction above is an example of

Air boiled out of water as steam is richer in

In the course of purifying water for town supply the water is passed through large settlings tanks, containing sodium aluminate (III) to remove

When a few drops of water is added to a blue anhydrous cobalt (II) chloride, the colour changes to

The vulcanizer's solution is prepared by dissolving rubber in

117.0g of sodium chloride was dissolved in the solubility in 1.0dm³ of distilled water at 25^oC. Determine the solubility in mol dm^-3 of sodium chloride at that temperature
[Na = 23, Cl = 35.5]

The uncovered raw food that is sold along major roads is likely to contain some amounts of

What is the pH of 0.001 mol dm^-3 solution of sodium hydroxide

The basicity of CH₃COOH is

0.05 mol dm^-3 HCl is neutralized by 25 cm³ NaOH. If the volume of acid used is 32.00cm³, what is the concentration of the base

Insoluble salts can be prepared by

The oxidation state of carbon in HCOOH is

What is the IUPAC nomenclature of the compound NaCIO?

In recharging a lead-acid accumulator, the reaction at the cathode can be represented as

If a given quantity of electricity liberates 0.65g of Zn²⁺, what amount of Hg²⁺ would be liberated by the same quantity of current?
[Zn = 65, Hg = 201]

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

Which of the following reaction is endothermic?

A catalyst speeds up the rate of chemical reaction by

The rate of a reaction usually decrease in the concentration of reactants because

The substance that is used in the steel industry for the removal of carbon, sulphur and phosphorus impurities from pig iron is

Which of the following compounds of trioxonitrate (V) will decomposes to give dinitrogen (i) oxide and water when heated?

When a solution of ammonium trioxocarbonate (IV) is added to a solution of an unknown salt, a white precipitate which is soluble in dilute hydrochloric acid but insoluble in ethanoic acid is formed. This indicates the presence of

Leads is used for making bullets and lead shots because of its

which of the following gives a precipitate when treated with NaOH solution?

The most common ores of iron include

The type of isomerism shown by cis- and trans- isomers is

If the silver mirror test is positive, it indicates the presence of an

If glucose is heated with concentration tetraoxosulphate (VI) acid, it will be dehydrated to

The IUPAC nomenclature for the structure above is

A hydrocarbon X with a molar mass of 26 consists of 92.3% carbon. What is its molecular formular

A red precipitate of copper (I) carbide is formed when ammonium solution of copper (I) chloride is introduced into

Reduction of nitroalkanes, nitrites and amides is a route for the preparation of

Reduction of alkanonoes with LialH₄ produces

The product obtained when a mixture of benzene vapour and hydrogen are passed over nickel catalyst at 180^oC is

Polyvinyl chloride is used in the production of

Detergents are manufactured with straight hydrocarbon chains so as to make them

Use the diagram to answer this question. The gas that can be used to demonstrate the experiment is

Use the diagram to answer this question.The colour of the fountain water is

Choose the correct option from the structure above