WAEC Chemistry Past Questions & Answers - Page 169

841.

When aqueous ammonia is added to one of the following solutions,a white precipitate which dissolved in excess ammonia is formed Identify the solution.

A.

ZnCl2(aq)

B.

Pb(NO3)2(aq)

C.

CuSO4(aq)

D.

FeSO4(aq)

Correct answer is A

No explanation has been provided for this answer.

842.

The indicator used in neutralizing CH3COOH and NaOH solution has pH range of

A.

3-5

B.

7-8

C.

8-103

D.

10-12

Correct answer is C

No explanation has been provided for this answer.

843.

Which of the following aqueous methods cannot be used to distinguish between a strong acid and a a weak acid?

A.

Conductivity measurement

B.

Measurement of pH

C.

Measurement of heat of neutralization

D.

Action on starch iodide paper

Correct answer is D

No explanation has been provided for this answer.

844.

Which of the following processes is an endothermic reaction?

A.

Dissolving NH4CI crystals in water

B.

Addition of concentrated H2SO4

C.

Dissolving NaOH pellets in water

D.

Passing SO3 gas into water

Correct answer is A

No explanation has been provided for this answer.

845.

Considered the reaction: H+(aq) + OH - (aq) → H2O
(l). The energy change taking place in the reaction above is enthalpy of

A.

formation

B.

hydration

C.

neutralization

D.

solution

Correct answer is C

No explanation has been provided for this answer.