WAEC Chemistry Past Questions & Answers - Page 23

111.

The following ions have the same electron configuration except 

\(_{8}\)O, \(_{12}\)Mg, \(_{13}\)AI, \(_{17}\)CI

A.

CI\(^{-}\)

B.

O\(^{2-}\)

C.

Mg\(^{2+}\)

D.

AI\(^{3+}\)

Correct answer is A

No explanation has been provided for this answer.

112.

An element, Q, contains 69% of\(^{63}\)Q and 31% of \(^{65}\)Q. What is the relative atomic mass of Q?

A.

63.0

B.

63.6

C.

65.0

D.

69.0

Correct answer is B

No explanation has been provided for this answer.

113.

Potassium trioxonitrate (V) can be obtained from its solution by----------

A.

distillation

B.

evapoartion

C.

crystallization

D.

filtration

Correct answer is C

No explanation has been provided for this answer.

114.

Which of the following statements is correct about ionization energy? It

A.

decreases across the periods

B.

results in the formation of an anion

C.

causes Metalic nuclei to disintegrate

D.

decreases down the group

Correct answer is D

No explanation has been provided for this answer.

115.

Which of the following species has the largest ionic radius

A.

S\(^{2-}\)

B.

K\(^{+}\)

C.

CI\(^{-}\)

D.

Ca\(^{2+}\)

Correct answer is A

No explanation has been provided for this answer.