WAEC Past Questions and Answers - Page 1580

7,896.

When ice is changing to water, its temperature remains the same because the heart gained is

A.

used to separate the molecules

B.

lost partially to the atmosphere

C.

used to increase the volume of ice

D.

less than the activation energy

Correct answer is A

No explanation has been provided for this answer.

7,897.

Which of the following compounds dissolves readily in water?

A.

BaSO4

B.

CuSO3

C.

NH4CI

D.

AgCI

Correct answer is C

No explanation has been provided for this answer.

7,898.

Consider the reaction represented by the equation below, xNH3(g) + yCI2(g) → zHCI(g) + N2(g) The values of x,y and z are respectively

A.

2, 4, 6

B.

3, 2, 4

C.

2, 3, 6

D.

3, 2 6

Correct answer is C

No explanation has been provided for this answer.

7,899.

A salt that absorbs moisture from the atmosphere without forming a solution is said to be

A.

efflorescent

B.

deliquescent

C.

hygroscopic

D.

insoluble

Correct answer is C

No explanation has been provided for this answer.

7,900.

What process is involved in the reaction represented by the following equation? AICI3 + 3H2O(l) → AI(OH) 3(s) + 3HCI(g)

A.

dehydration

B.

hydrolysis

C.

double decomposition

D.

Neutralization

Correct answer is B

No explanation has been provided for this answer.