WAEC Chemistry Past Questions & Answers - Page 25

121.

Elements with high ionization energies would-------

A.

lose electrons easily

B.

have large atomic radii

C.

have high effective nuclear charges

D.

have low atomic numbers

Correct answer is C

No explanation has been provided for this answer.

122.

The collision between ideal gas molecules are considered to be perfectly elastic because

A.

they collide without losing energy

B.

they move randomly in a straight line

C.

their average kinetic energy is variable

D.

the distance between them is large compared to their size

Correct answer is A

No explanation has been provided for this answer.

123.

Under which conditions of pressure (p) and temperature (T) would the volume of an inflated ballon increase? When

A.

P and T are increased

B.

both T and P are decreased

C.

T is increased and P is decreased

D.

T is decreased and P is increased

Correct answer is C

No explanation has been provided for this answer.

124.

Consider the structure above

How many carbon atoms does the parent chain contain? 

A.

5

B.

4

C.

3

D.

2

Correct answer is B

Going by the longest continuous carbon chain, the parent chain contains 4 carbon atoms (2- methyl butanoic acid)

125.

When CuSO\(_{4(aq)}\) is added to Pb(NO\(_{3}\))\(_{2(aq)}\)--------

A.

there would be no visible change

B.

a blue precipitate would be formed

C.

the resulting solution would become colourless

D.

a white precipitate would be formed

Correct answer is D

No explanation has been provided for this answer.