WAEC Past Questions and Answers - Page 1678

8,386.

The position of equilibrium in a reversible reaction is affected by

A.

particle size of the reactants

B.

change in concentration of the reactants

C.

change in size of the reaction vessel

D.

vigorous stirring of the reaction mixture

E.

presence of a catalyst

Correct answer is B

No explanation has been provided for this answer.

8,387.

How much heat will be liberated if 8g of hydrogen burns in excess oxygen according to the following equation? 2H2 + O2→ 2H2O,∆H = -571.7KJ (H = 1)

A.

1.42.9KJ

B.

571.7KJ

C.

1143.4KJ

D.

285.9KJ

E.

2286.8KJ

Correct answer is C

No explanation has been provided for this answer.

8,388.

If the value of ∆H for a reaction is negative, it means that the reaction is

A.

slow

B.

exothermic

C.

spontaneous

D.

irreversible

E.

not feasible

Correct answer is B

No explanation has been provided for this answer.

8,389.

Tomatoes are staked in order to

A.

Accelerate their growth

B.

Induce flowering

C.

Accelerate fruit ripening

D.

Prevent rotting of fruits

Correct answer is D

No explanation has been provided for this answer.

8,390.

The correct sequence for the use of coupled implements for land preparation is

A.

Plough, harrow and ridger

B.

Harrow, ridger and plough

C.

Plough, ridger and harrow

D.

Harrow, plough and ridger

Correct answer is A

No explanation has been provided for this answer.