2009 JAMB Chemistry Past Questions CBT

A mixture of sugar and sulphur can be separated by

Which of the following is a physical change?

The percentage of water of crystallization in ZnSO₄ .7H₂O is

(Zn = 65, S = 32, O = 16, H = 1)

0.0075 mole of calcium trioxocarbonate(IV) is added to 0.015 mole of a solution of hydrochloric acid. The volume of gas evolved at s.t.p. is

(Molar volume of a gas at s.t.p = 22.4 dm³)

A gas exerts pressure on its container because

The basic assumption in the kinetic theory of gases that the collisions of the gaseous molecules are perfectly elastic implies that the

If an atom is represented as \( \scriptsize _{11} ^{23} \textrm {X}\),  which of the following deductions is correct?

If the relative molecular mass of an element is not a whole number, it can be deduced that the element is

Cathode rays cause an object placed behind a perforated anode to cast a shadow on the screen. This observation shows that the rays

Which quantum number divides shells into orbitals?

The type of bonding in Cu(NH₃)₄²⁺ is

The mixture of gasses used in a photographers flash tube is

When sodum trioxocarbonate(IV) decahydrate loses its water of crystallization to the atmosphere, the process is

Water can be obtained as the only product during the

If 10.5 g of lead(II) trioxonitrate(V) is dissolved in 20 cm³ of distilled water at 18ºC, the solubility of the solute in mol dm^-3 is

(Pb = 207, N = 14, 0 = 16)

For a given solute, the concentrations of its saturated solution in different solvents are

The major source of oxides of nitrogen is from the burning of

The acid used in electrolysis of water is dilute

What volume of 1.5 M solution of KOH would contain 0.045 moles?

The salt formed from a reaction between citric acid and sodium hydroxide in solution will be

The colour change observed when testing for reducing agents using acidified potassium heptaoxodichromate(VI) solution is

The oxidation state of Cr in K₂Cr₂O₇ is

Which of the following metals is purified commercially by electrolysis?

What current will deposit 3.25 g of zinc in 2 hrs?

[Zn = 65, F = 96500 mol^-1]

C_(s) + H₂O_(g) → H_2(g) + CO_2(g)

ΔG for the reaction above at 1300K is  -43 KJ. At this temperature, the reaction is

A Catalyst increases the rate of a chemical reaction by providing a path that

Two equal bulbs, one containing ammonia and the other nitrogen, are opened mouth-to-mouth in the mixture of gases is likely to

In the diagram above, which of the curves represents the evolution of oxygen with time in the equation:

2KClO_3(s) → 2KCl_(s) + 3O_2(g) ?

CuO_(s)  +   H_2(g) \( \leftrightharpoons \) Cu_(s)    +   H₂O_(l)

What is the effect of increasing the pressure on the equilibrium reaction above?

The equilibrium of an endothermic reaction which proceeds with an increase in volume can be shifted in the reverse direction by

The oxidation of ammonia in excess air produces

Hydrogen sulphide gas can act as

The gasification of coke is used for the manufacture of

The gas that is most useful in protecting humans against solar radiations is

Which of the allotrope of carbon is a constituent of a lead pencil?

Which of the following metals will show the highest metallic character?

Copper metal dissolves in concentrated trioxonitrate(V) acid with the resultant evolution of

The type of iron that is best suited for welding, making nails, chains and iron rods is

In the electrolytic extraction of aluminium, the function of the molten cryolite is to

One of the products of the thermal decomposition of sodium trioxonitrate(V) is

A cracking process in petroleum refining can be represented by

Which of the following molecules has two other positional isomers?

Which of the following class of compounds can exist as dipolar ions in solution?

Lucas reagent is used to test for

A compound commonly used for sterilization and preservation of specimens and food is

An organic compound reacted with bromine water to give a colourless solution. The compound is probably an

Which of the following hydrocarbons is mainly used as fuel?

The molecular formula of a common organic laboratory anaesthetic is

Organic molecules that have the suffix-ene are unsaturated hydrocarbons that have