JAMB Chemistry questions

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

All topics Acids, bases and salts · 32 Air · 21 Atomic structure and bonding · 33 Chemical combination · 31 Chemical equilibrium · 21 Chemistry and industry · 18 Electrolysis · 22 Energy changes · 22 Environmental pollution · 17 Kinetic theory of matter and gas laws · 27 Metals and their compounds · 24 Non-metals and their compounds · 23 Organic compounds · 43 Oxidation and reduction · 22 Rates of chemical reaction · 22 Separation of mixtures and purification · 24 Solubility · 20 Water · 21

Question 401· Separation of mixtures and purification· JAMB
Decantation is used to separate
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Answer: D. a liquid from a solid that has settled at the bottom
Explanation and discussion
Question 402· Separation of mixtures and purification· JAMB
In a paper chromatogram, a spot moves 3 cm while the solvent front moves 6 cm. Find the Rf value of the spot.
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Answer: B. 0.5
Explanation and discussion
Question 403· Solubility· JAMB
A suspension differs from a colloid in that
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Answer: A. its particles settle on standing
Explanation and discussion
Question 404· Solubility· JAMB
The scattering of a beam of light passing through a liquid (the Tyndall effect) shows that the liquid is
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Answer: C. a colloid
Explanation and discussion
Question 405· Solubility· JAMB
In a solution of sugar in water, the water is the
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Answer: A. solvent
Explanation and discussion
Question 406· Solubility· JAMB
50 g of a salt saturates 200 g of water at 30 °C. Find its solubility in grams per 100 g of water.
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Answer: A. 25 g
Explanation and discussion
Question 407· Solubility· JAMB
Find the concentration in g/dm³ of a 0.5 mol/dm³ solution of sodium hydroxide. (NaOH = 40)
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Answer: C. 20 g/dm³
Explanation and discussion
Question 408· Solubility· JAMB
The solubility of sodium chloride at 25 °C is 36 g per 100 g of water. What mass will dissolve in 50 g of water at 25 °C?
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Answer: D. 18 g
Explanation and discussion
Question 409· Solubility· JAMB
A suspension differs from a true solution in that its particles
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Answer: C. are large enough to settle out
Explanation and discussion
Question 410· 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 411· Solubility· JAMB
Milk is an example of
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Answer: D. an emulsion
Explanation and discussion
Question 412· 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 413· 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 414· 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 415· 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 416· Solubility· JAMB
For most solid solutes, solubility in water
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Answer: B. increases with temperature
Explanation and discussion
Question 417· 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 418· 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 419· 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 420· 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

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JAMB Chemistry questions

Decantation is used to separate

In a paper chromatogram, a spot moves 3 cm while the solvent front moves 6 cm. Find the Rf value of the spot.

A suspension differs from a colloid in that

The scattering of a beam of light passing through a liquid (the Tyndall effect) shows that the liquid is

In a solution of sugar in water, the water is the

50 g of a salt saturates 200 g of water at 30 °C. Find its solubility in grams per 100 g of water.

Find the concentration in g/dm³ of a 0.5 mol/dm³ solution of sodium hydroxide. (NaOH = 40)

The solubility of sodium chloride at 25 °C is 36 g per 100 g of water. What mass will dissolve in 50 g of water at 25 °C?

A suspension differs from a true solution in that its particles

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

Milk is an example of

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 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?

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?

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