WAEC Chemistry Past Questions & Answers - Page 217

1,081.

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

A.

Glucose

B.

Sodium trioxonitrate (V)

C.

Ethananoic acid

D.

Silver chloride

Correct answer is B

No explanation has been provided for this answer.

1,082.

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

A.

element in the free state is zero

B.

monatomic ion is equal to its charge

C.

alkali meta like sodium in its compounds is + 1

D.

atom of a diatomic molecules is + 2

Correct answer is D

No explanation has been provided for this answer.

1,083.

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

A.

Activation energy will decrease

B.

the forward reaction will be favoured

C.

the concentration of ammonia will increase

D.

the reaction will go to completion

Correct answer is C

No explanation has been provided for this answer.

1,084.

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

A.

the temperature is raised

B.

the pressure increased

C.

the volume of the system is increased

D.

a catalysty is intoduced into the system

Correct answer is C

No explanation has been provided for this answer.

1,085.

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

A.

Freezing mixture

B.

Reducing agent

C.

Water

D.

Catalyst

Correct answer is D

No explanation has been provided for this answer.