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 661· Rates of chemical reaction· JAMB
Increasing the concentration of reactants increases the rate because
Show answer
Answer: D. collisions become more frequent
Explanation and discussion
Question 662· Rates of chemical reaction· WAEC
A catalyst speeds up a reaction by
Show answer
Answer: B. providing a pathway with lower activation energy
Explanation and discussion
Question 663· 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
Show answer
Answer: C. gas syringe
Explanation and discussion
Question 664· Rates of chemical reaction· JAMB
According to the collision theory, a reaction takes place when particles collide
Show answer
Answer: D. with enough energy and in the right orientation
Explanation and discussion
Question 665· Rates of chemical reaction· JAMB
The rate of a reaction that gives off a gas can be followed by measuring the
Show answer
Answer: B. volume of gas produced per unit time
Explanation and discussion
Question 666· 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
Show answer
Answer: B. larger surface area
Explanation and discussion
Question 667· Rates of chemical reaction· JAMB
An enzyme is
Show answer
Answer: D. a biological catalyst
Explanation and discussion
Question 668· Rates of chemical reaction· WAEC
Which apparatus is suitable for following the rate of a reaction that gives off a gas?
Show answer
Answer: D. a gas syringe and a stop-clock
Explanation and discussion
Question 669· Rates of chemical reaction· JAMB
When dilute hydrochloric acid reacts with marble chips, the gas collected to follow the rate is
Show answer
Answer: D. carbon(IV) oxide
Explanation and discussion
Question 670· Rates of chemical reaction· WAEC
Increasing temperature increases reaction rate mainly because
Show answer
Answer: A. more particles have energy above the activation energy
Explanation and discussion
Question 671· Rates of chemical reaction· WAEC
Which of these will increase the rate of reaction between calcium trioxocarbonate(IV) and dilute hydrochloric acid?
Show answer
Answer: B. using powdered calcium trioxocarbonate(IV)
Explanation and discussion
Question 672· Rates of chemical reaction· WAEC
Manganese(IV) oxide speeds up the decomposition of hydrogen peroxide. It acts as
Show answer
Answer: B. a catalyst
Explanation and discussion
Question 673· Rates of chemical reaction· JAMB
A catalyst increases the rate of a reaction by
Show answer
Answer: B. lowering the activation energy
Explanation and discussion
Question 674· Rates of chemical reaction· WAEC
A catalyst speeds up a chemical reaction by
Show answer
Answer: C. lowering the activation energy
Explanation and discussion
Question 675· Rates of chemical reaction· WAEC
In the decomposition of hydrogen peroxide, manganese(IV) oxide
Show answer
Answer: A. speeds up the reaction and is unchanged at the end
Explanation and discussion
Question 676· Rates of chemical reaction· WAEC
Powdered marble reacts faster with acid than lumps because
Show answer
Answer: D. it has a larger surface area
Explanation and discussion
Question 677· Rates of chemical reaction· JAMB
The decomposition of hydrogen peroxide into water and oxygen is catalysed by
Show answer
Answer: A. manganese(IV) oxide
Explanation and discussion
Question 678· Rates of chemical reaction· JAMB
A suitable unit for the rate of a reaction is
Show answer
Answer: C. mol dm⁻³ s⁻¹
Explanation and discussion
Question 679· Rates of chemical reaction· JAMB
Raising the temperature increases the rate of a reaction mainly because
Show answer
Answer: A. more particles have energy equal to or greater than the activation energy
Explanation and discussion
Question 680· Rates of chemical reaction· WAEC
The rate of a reaction that produces a gas can be followed by measuring the
Show answer
Answer: C. volume of gas collected at time intervals
Explanation and discussion

Practise Chemistry like the real exam. A timed CBT, your score, and the topics to fix.

Start a Chemistry test

JAMB and WAEC Chemistry questions

Increasing the concentration of reactants increases the rate because

A catalyst speeds up a reaction by

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

Which apparatus is suitable for following the rate of a reaction that gives off a gas?

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

Increasing temperature increases reaction rate mainly because

Which of these will increase the rate of reaction between calcium trioxocarbonate(IV) and dilute hydrochloric acid?

Manganese(IV) oxide speeds up the decomposition of hydrogen peroxide. It acts as

A catalyst increases the rate of a reaction by

A catalyst speeds up a chemical reaction by

In the decomposition of hydrogen peroxide, manganese(IV) oxide

Powdered marble reacts faster with acid than lumps because

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

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