Waec Chemistry 2021 Past Questions and Answers

Question 41:

• WAEC 2021

Which of the following species has the largest ionic radius

A. S\(^{2-}\)K\(^{+}\)
B. CI\(^{-}\)
C. Ca\(^{2+}\)

Question 42:

• WAEC 2021

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

Question 43:

• WAEC 2021

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

A. Distillation
B. Evapoartion
C. Crystallization
D. Filtration

Question 44:

• WAEC 2021

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

Question 45:

• WAEC 2021

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\(^{3+}\)