JAMB and WAEC Chemistry questions

800 questions with answers and explanations. Tap an option to check yourself.

All topics Acids, bases and salts · 58 Air · 37 Atomic structure and bonding · 59 Chemical combination · 58 Chemical equilibrium · 37 Chemistry and industry · 35 Electrolysis · 41 Energy changes · 38 Environmental pollution · 32 Kinetic theory of matter and gas laws · 45 Metals and their compounds · 47 Non-metals and their compounds · 45 Organic compounds · 72 Oxidation and reduction · 41 Rates of chemical reaction · 38 Separation of mixtures and purification · 42 Solubility · 36 Water · 39

Question 741· Solubility· JAMB
5.85 g of sodium chloride is dissolved to make 500 cm³ of solution. Find its concentration. [Na = 23, Cl = 35.5]
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Answer: A. 0.2 mol/dm³
Explanation and discussion
Question 742· Solubility· WAEC
Which of these is a suspension?
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Answer: B. muddy water
Explanation and discussion
Question 743· Solubility· WAEC
Undissolved sugar remains at the bottom of a cup of tea after long stirring at a fixed temperature. The tea is
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Answer: A. saturated with sugar
Explanation and discussion
Question 744· Solubility· WAEC
Mayonnaise, made by shaking oil with egg and vinegar, is an example of
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Answer: C. an emulsion
Explanation and discussion
Question 745· Solubility· WAEC
Which gas is most soluble in water at room temperature?
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Answer: B. ammonia
Explanation and discussion
Question 746· Solubility· JAMB
Milk is an example of
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Answer: D. an emulsion
Explanation and discussion
Question 747· Solubility· WAEC
A solution containing more solute than it can normally hold at that temperature is
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Answer: C. supersaturated
Explanation and discussion
Question 748· Solubility· JAMB
As the temperature of water rises, the solubility of most gases in it
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Answer: B. decreases
Explanation and discussion
Question 749· Solubility· JAMB
A solution holding more solute than it normally can at that temperature is
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Answer: B. supersaturated
Explanation and discussion
Question 750· Solubility· WAEC
A solubility curve shows
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Answer: D. how the solubility of a substance changes with temperature
Explanation and discussion
Question 751· Solubility· JAMB
A solution that contains more solute than it can normally hold at that temperature is
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Answer: C. supersaturated
Explanation and discussion
Question 752· Solubility· JAMB
Fizzy drinks are bottled under pressure because
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Answer: C. more carbon(IV) oxide dissolves at higher pressure
Explanation and discussion
Question 753· Solubility· JAMB
For most solid solutes, solubility in water
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Answer: B. increases with temperature
Explanation and discussion
Question 754· Solubility· JAMB
The solubility of potassium trioxonitrate(V) is 80 g per 100 g of water at 50 °C and 40 g per 100 g at 20 °C. What mass crystallises when a saturated solution containing 200 g of water is cooled from 50 °C to 20 °C?
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Answer: A. 80 g
Explanation and discussion
Question 755· Solubility· WAEC
The solubility of a salt is 36 g per 100 g of water at 25 °C. What mass of it dissolves in 250 g of water at that temperature?
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Answer: A. 90 g
Explanation and discussion
Question 756· Solubility· JAMB
7.45 g of potassium chloride is dissolved in water to make 100 cm³ of solution. Find its concentration. (K = 39, Cl = 35.5)
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Answer: D. 1.0 mol/dm³
Explanation and discussion
Question 757· Solubility· JAMB
The solubility of potassium trioxonitrate(V) at 30 °C is 45 g per 100 g of water. What mass will saturate 250 g of water at 30 °C?
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Answer: C. 112.5 g
Explanation and discussion
Question 758· Solubility· WAEC
20 g of a salt dissolves in 50 g of water at 30 °C. Its solubility at 30 °C, in grams per 100 g of water, is
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Answer: C. 40 g
Explanation and discussion
Question 759· Solubility· JAMB
Fractional crystallisation separates two salts by making use of differences in their
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Answer: B. solubility at different temperatures
Explanation and discussion
Question 760· Solubility· JAMB
The solubility of KNO₃ is 60 g per 100 g of water at 40 °C and 30 g per 100 g at 20 °C. What mass of crystals forms when 160 g of saturated solution at 40 °C is cooled to 20 °C?
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Answer: C. 30 g
Explanation and discussion

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JAMB and WAEC Chemistry questions

5.85 g of sodium chloride is dissolved to make 500 cm³ of solution. Find its concentration. [Na = 23, Cl = 35.5]

Which of these is a suspension?

Undissolved sugar remains at the bottom of a cup of tea after long stirring at a fixed temperature. The tea is

Mayonnaise, made by shaking oil with egg and vinegar, is an example of

Which gas is most soluble in water at room temperature?

Milk is an example of

A solution containing more solute than it can normally hold at that temperature is

As the temperature of water rises, the solubility of most gases in it

A solution holding more solute than it normally can at that temperature is

A solubility curve shows

A solution that contains more solute than it can normally hold at that temperature is

Fizzy drinks are bottled under pressure because

For most solid solutes, solubility in water

The solubility of potassium trioxonitrate(V) is 80 g per 100 g of water at 50 °C and 40 g per 100 g at 20 °C. What mass crystallises when a saturated solution containing 200 g of water is cooled from 50 °C to 20 °C?

The solubility of a salt is 36 g per 100 g of water at 25 °C. What mass of it dissolves in 250 g of water at that temperature?

7.45 g of potassium chloride is dissolved in water to make 100 cm³ of solution. Find its concentration. (K = 39, Cl = 35.5)

The solubility of potassium trioxonitrate(V) at 30 °C is 45 g per 100 g of water. What mass will saturate 250 g of water at 30 °C?

20 g of a salt dissolves in 50 g of water at 30 °C. Its solubility at 30 °C, in grams per 100 g of water, is

Fractional crystallisation separates two salts by making use of differences in their

The solubility of KNO₃ is 60 g per 100 g of water at 40 °C and 30 g per 100 g at 20 °C. What mass of crystals forms when 160 g of saturated solution at 40 °C is cooled to 20 °C?