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 361· Rates of chemical reaction· JAMB
Photographic film works because silver halides
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Answer: D. decompose when exposed to light
Explanation and discussion
Question 362· Rates of chemical reaction· JAMB
Increasing the concentration of an acid increases its rate of reaction with marble because
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Answer: C. the reacting particles collide more often
Explanation and discussion
Question 363· Rates of chemical reaction· JAMB
Enzymes are
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Answer: D. biological catalysts
Explanation and discussion
Question 364· Rates of chemical reaction· JAMB
A suitable unit for the rate of reaction measured as change in concentration with time is
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Answer: A. mol dm⁻³ s⁻¹
Explanation and discussion
Question 365· Rates of chemical reaction· JAMB
A substance that slows down a chemical reaction is called
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Answer: B. an inhibitor
Explanation and discussion
Question 366· Rates of chemical reaction· JAMB
A negative catalyst (inhibitor)
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Answer: C. slows down a reaction
Explanation and discussion
Question 367· Rates of chemical reaction· JAMB
Increasing the concentration of reactants increases the rate because
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Answer: D. collisions become more frequent
Explanation and discussion
Question 368· Rates of chemical reaction· JAMB
The rate of the reaction between magnesium and dilute hydrochloric acid can be followed by collecting the hydrogen in a
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Answer: C. gas syringe
Explanation and discussion
Question 369· Rates of chemical reaction· JAMB
According to the collision theory, a reaction takes place when particles collide
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Answer: D. with enough energy and in the right orientation
Explanation and discussion
Question 370· Rates of chemical reaction· JAMB
The rate of a reaction that gives off a gas can be followed by measuring the
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Answer: B. volume of gas produced per unit time
Explanation and discussion
Question 371· Rates of chemical reaction· JAMB
Powdered marble reacts faster with dilute acid than lumps of marble of the same mass because the powder has a
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Answer: B. larger surface area
Explanation and discussion
Question 372· Rates of chemical reaction· JAMB
An enzyme is
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Answer: D. a biological catalyst
Explanation and discussion
Question 373· Rates of chemical reaction· JAMB
When dilute hydrochloric acid reacts with marble chips, the gas collected to follow the rate is
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Answer: D. carbon(IV) oxide
Explanation and discussion
Question 374· Rates of chemical reaction· JAMB
A catalyst increases the rate of a reaction by
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Answer: B. lowering the activation energy
Explanation and discussion
Question 375· Rates of chemical reaction· JAMB
The decomposition of hydrogen peroxide into water and oxygen is catalysed by
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Answer: A. manganese(IV) oxide
Explanation and discussion
Question 376· Rates of chemical reaction· JAMB
A suitable unit for the rate of a reaction is
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Answer: C. mol dm⁻³ s⁻¹
Explanation and discussion
Question 377· Rates of chemical reaction· JAMB
Raising the temperature increases the rate of a reaction mainly because
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Answer: A. more particles have energy equal to or greater than the activation energy
Explanation and discussion
Question 378· Rates of chemical reaction· JAMB
Which of the following does NOT increase the rate of a reaction?
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Answer: B. using a larger lump of solid instead of powder
Explanation and discussion
Question 379· Separation of mixtures and purification· JAMB
Ethanol (boiling point 78 °C) can be separated from water by
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Answer: A. fractional distillation
Explanation and discussion
Question 380· Separation of mixtures and purification· JAMB
The purest sample of common salt is obtained from sea water by
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Answer: B. crystallisation
Explanation and discussion

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JAMB Chemistry questions

Photographic film works because silver halides

Increasing the concentration of an acid increases its rate of reaction with marble because

Enzymes are

A suitable unit for the rate of reaction measured as change in concentration with time is

A substance that slows down a chemical reaction is called

A negative catalyst (inhibitor)

Increasing the concentration of reactants increases the rate because

The rate of the reaction between magnesium and dilute hydrochloric acid can be followed by collecting the hydrogen in a

According to the collision theory, a reaction takes place when particles collide

The rate of a reaction that gives off a gas can be followed by measuring the

Powdered marble reacts faster with dilute acid than lumps of marble of the same mass because the powder has a

An enzyme is

When dilute hydrochloric acid reacts with marble chips, the gas collected to follow the rate is

A catalyst increases the rate of a reaction by

The decomposition of hydrogen peroxide into water and oxygen is catalysed by

A suitable unit for the rate of a reaction is

Raising the temperature increases the rate of a reaction mainly because

Which of the following does NOT increase the rate of a reaction?

Ethanol (boiling point 78 °C) can be separated from water by

The purest sample of common salt is obtained from sea water by