1999 WAEC SSCE Chemistry Past Questions

1999

Which of the following movements can be described as random motion?

1999

Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of

1999

One mole of a compound M(HCO3)2 has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16]

1999

If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly

1999

Which of the following compounds has the highest ionic character?

1999

30cm3 pf hydrogen at s.t.p combine with 20cm3 of oxygen to form steam according to the following equation 2H2(g) + O2(g) → 2H2O(g). Calculate the total volume of the gaseous mixture at the end of the reaction

1999

Helium is preferred to hydrogen in filling balloons because hydrogen

1999

What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the following equation? Zn(s) + 2HCI(aq) → ZnCI 2(aq) + H2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm3 at s.t.p]

1999

Gas molecules are said to be perfectly elastic because

1999

Equal volumes of CO2 cnd CO at s.t.p have the same

1999

The property of calcium chloride which makes it useful as a drying agent is that it is

1999

If the solubility of KHCO3 is 0.40 mole dm-3 at room temperature , calculate the mass of KHCO3 in 100dm3 of the solution at this temperature. [KHCO3 = 100hmol]

1999

Which of the following compounds dissolves in water to form a solution with pH below 7?

1999

Which of the following is an acid salt?

1999

An exothermic reaction is one which involves

1999

Equal volumes of water were added to one mole of each of the following compounds. Which of them produced the largest number of ions

1999

Which of the following is not correct about oxidation number convention? The oxidation number of a/an

1999

What will be the effect of increase in pressure on the following system at equilibrium? 2NH2(g) N2(g) + 3H2(g)

1999

Consider the reaction represented by the following equation: H2(g) + 12(g) → 2HI(g). The number of effective collisions of molecules of the reactants decreases as

1999 WAEC SSCE Chemistry Past Questions

Which of the following movements can be described as random motion?

Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of

One mole of a compound M(HCO3)2 has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16]

If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly

Which of the following compounds has the highest ionic character?

30cm3 pf hydrogen at s.t.p combine with 20cm3 of oxygen to form steam according to the following equation 2H2(g) + O2(g) → 2H2O(g). Calculate the total volume of the gaseous mixture at the end of the reaction

Helium is preferred to hydrogen in filling balloons because hydrogen

What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the following equation? Zn(s) + 2HCI(aq) → ZnCI 2(aq) + H2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm3 at s.t.p]

Gas molecules are said to be perfectly elastic because

Equal volumes of CO2 cnd CO at s.t.p have the same

The property of calcium chloride which makes it useful as a drying agent is that it is

If the solubility of KHCO3 is 0.40 mole dm-3 at room temperature , calculate the mass of KHCO3 in 100dm3 of the solution at this temperature. [KHCO3 = 100hmol]

Which of the following compounds dissolves in water to form a solution with pH below 7?

Which of the following is an acid salt?

An exothermic reaction is one which involves

Equal volumes of water were added to one mole of each of the following compounds. Which of them produced the largest number of ions

Which of the following is not correct about oxidation number convention? The oxidation number of a/an

What will be the effect of increase in pressure on the following system at equilibrium? 2NH2(g) N2(g) + 3H2(g)

Consider the reaction represented by the following equation: H2(g) + 12(g) → 2HI(g). The number of effective collisions of molecules of the reactants decreases as

Which of the following lowers the activation energy of a chemical reaction?