WAEC Chemistry Past Questions & Answers - Page 116

576.

Which of the following organic compounds would decolourize bromie water?

A.

Benzene

B.

Cyclobutane

C.

Hexane

D.

Pentane

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

577.

The major product formed by the reaction between ethanoic acid and aqueous sodium hydroxide is

A.

soap

B.

sodium ethanoate

C.

sodium methoxide

D.

water

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

578.

Consider the redox reaction as represented by the following equation: 1_2(aq) + 2S₂O₃^2-_(aq) → 21^-_(aq) + S₄O₆^2-_(aq). Which of the species in the equation is reduced?

A.

S₄O₆^2-_(aq)

B.

S₄O₃^2-_(aq)

C.

1_2(aq)

D.

1^-_(aq)

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

579.

Which of the following cells produce electrical energy from chemical reactions?
l. Lead-acid battery ll. Dry cell III. Deniell cell IV Electrolytic cell

A.

l and ll only

B.

l, ll, and III only

C.

lll and IV only

D.

I and III only

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

580.

Consider the reaction represented by the equation: N₂O_4(g) ⇌ 2NO_2(g) ; ∆H = + x kJmol^-1
What happens when the temperature is reduced at equilibrium?

A.

Concentration of N ₂O_4(g) decreases

B.

Concentration of N ₂O_4(g) increases.

C.

Pressure exerted by the gases increases

D.

Pressure exerted by the gases remains constant

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

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