1989 WAEC SSCE Chemistry Past Questions

1989

The following are miscible with water except

1989

The most suitable method to use when separating an insoluble solid from a liquid is

1989

Which of the following hydrocarbons is not likely to be present in petrol?

1989

The earthly impurities in iron ore are removed in the blast furnace by the reaction

1989

120cm3 of hydrogen were sparked with 60cm 3 of oxygen at 110oC. What was the volume of stream produced? The equation for the reaction is 2H2(g) + O2(g) → 2H2O(g)

1989

When an element can exist in two or more forms in the same physical state, the element is said to exhibit

1989

Given that for the reaction KOH (aq) + HCI(aq) → KCI(aq) + H2O(L) H = - 54 Kj mol-1. What is the quantity of heat involved in the reaction?2NaOH(aq) + H2SO 4(aq) → Na2SO4(aq) + 2H 2O(l)?

1989

Which of the following gases will bleach moist litmus paper?

1989

How many carbon atoms are there in a benzene ring?

1989

If 200cm 3 of a gas at s.t.p. has a mass of 0.268g, what is its molar mass? (Molar volume of a gas at s.t.p. = 22.4 dm3)

1989

The rate of the hydrogen in the reaction Zn(s) + 2HCI (aq) → ZnCI 2(g) + H 2(aq) + H 2(g) can be increased by

1989

Why is potassium fluoride added to the electrolyte in the extraction of sodium from fused sodium chloride?

1989

Locally produced soap in which wood ash is used as the base is usually soft because the wood ash contains a lot of

1989

Copper can best be purified by

1989

Which of the following carbohydrates does NOT usually occur in the crystalline form?

1989

What is the concentration, in mol dm 3, of solution is allowed to evaporate the allotrope of sulphur formed is

1989

Given that 1 mole of carbon -12 weighs 12.0g, how many atoms are there in 24.0g magnesium? (C = 12, Mg = 24, NA = 6.02 x 10 23mol-1)

1989

Which of the following is used extensively in manufacturing photographic chemicals?

1989

Given the following half-cell reaction; 2Cl(aq) → CI2(g) + 2e, how many mole of electrons will be required to produce 1.12dm3 of chlorine gas at s.t.p? (Molar volume of a gas at s.t.p. = 22.4dm 3)

1989 WAEC SSCE Chemistry Past Questions

The following are miscible with water except

The most suitable method to use when separating an insoluble solid from a liquid is

Which of the following hydrocarbons is not likely to be present in petrol?

The earthly impurities in iron ore are removed in the blast furnace by the reaction

120cm3 of hydrogen were sparked with 60cm 3 of oxygen at 110oC. What was the volume of stream produced? The equation for the reaction is 2H2(g) + O2(g) → 2H2O(g)

When an element can exist in two or more forms in the same physical state, the element is said to exhibit

Given that for the reaction KOH (aq) + HCI(aq) → KCI(aq) + H2O(L) H = - 54 Kj mol-1. What is the quantity of heat involved in the reaction?2NaOH(aq) + H2SO 4(aq) → Na2SO4(aq) + 2H 2O(l)?

Which of the following gases will bleach moist litmus paper?

How many carbon atoms are there in a benzene ring?

If 200cm 3 of a gas at s.t.p. has a mass of 0.268g, what is its molar mass? (Molar volume of a gas at s.t.p. = 22.4 dm3)

The rate of the hydrogen in the reaction Zn(s) + 2HCI (aq) → ZnCI 2(g) + H 2(aq) + H 2(g) can be increased by

Why is potassium fluoride added to the electrolyte in the extraction of sodium from fused sodium chloride?

Locally produced soap in which wood ash is used as the base is usually soft because the wood ash contains a lot of

Copper can best be purified by

Which of the following carbohydrates does NOT usually occur in the crystalline form?

What is the concentration, in mol dm 3, of solution is allowed to evaporate the allotrope of sulphur formed is

Given that 1 mole of carbon -12 weighs 12.0g, how many atoms are there in 24.0g magnesium? (C = 12, Mg = 24, NA = 6.02 x 10 23mol-1)

Which of the following is used extensively in manufacturing photographic chemicals?

Given the following half-cell reaction; 2Cl(aq) → CI2(g) + 2e, how many mole of electrons will be required to produce 1.12dm3 of chlorine gas at s.t.p? (Molar volume of a gas at s.t.p. = 22.4dm 3)

Octane number is highest in petrol containing a high proportion of