Waec Chemistry 2021 Past Questions and Answers

Question 16:

• WAEC 2021

Consider the following diagram and use it to answer the question below



Which of the following cell notations represent the diagram

A. B\(^{2}\)+/B/ /A/A\(^{3+}\)
B. A\(^{3+}\) /A/ /B/B\(^{2+}\)
C. B/B\(^{2+}\)/ /A/\(^{3+}\)
D. A/A\(^{3+}\)/ /B\(^{2+}\)/B

Question 17:

• WAEC 2021

Consider the following diagram and use it to answer the question below



Which of the following half reaction equations represent the reaction at the cathode

A. A\(^{3+_{(aq)}}\)+3e\(^{-}\) \(\rightarrow\) A\(_{(s)}\)
B. B\(^{2+_{(aq)}}\)+2e\(^{-}\) \(\rightarrow\) B\(_{(s)}\)
C. A\(_{(s)}\) \(\rightarrow\) \(^{3+_{(aq)}}\)+3e\(^{-}\)
D. B\(_{(s)}\) \(\rightarrow\) B\(^{2+_{(aq)}}\) + 2e\(^{-}\)

Question 18:

• WAEC 2021

The hydrolysis of proteins by diluting mineral acids produces

A. Sucrose
B. Glucose
C. Amino acids
D. Fatty acids

Question 19:

• WAEC 2021

The hydrolysis of proteins by diluting mineral acids produces

A. Sucrose
B. Glucose
C. Amino acids
D. Fatty acids

Question 20:

• WAEC 2021

Which of the following oxide causes acid rain?

A. CO
B. NO
C. H\(_{2}\)O\(_{2}\)
D. NO\(_{2}\)