Waec Chemistry 2016 Past Questions and Answers

Question 41:

• WAEC 2016

Consider the following half-cell reactions.
Al_(s) \(\to\) Al³⁺_(aq) + 3e^-
Cu²⁺_(aq) + 2e^- \(\to\) Cu_(s)
The overall equation for the reaction is

A. Al_(s) + Cu²⁺_(aq) \(\to\) Al³⁺_(aq) + Cu_(s)
B. 2Al_(s) + Cu²⁺_(aq) \(\to\) 2Al_(aq) + Cu_(s)
C. 2Al_(s) + 3Cu²⁺_(aq) \(\to\) 3Cu_(s) + 2Al³⁺_(aq)
D. 3Al_(s) + 2Cu²⁺_(aq) \(\to\) Cu_(s) + 3Al³⁺_(aq)

Question 42:

• WAEC 2016

Amino acids are obtained from proteins by

A. Hydrolysis
B. Oxidation
C. Polymerization
D. Reduction

Question 43:

• WAEC 2016

When a compound X is heated with concentrated tetraoxosulphate(VI)acid, it produces an alkene. X ia an

A. Alkane
B. Alkanol
C. Alkanoate
D. Alkyne

Question 44:

• WAEC 2016

Ripening of fruits is hastened by using

A. Ethanol
B. Ethane
C. Ethene
D. Ethyne

Question 45:

• WAEC 2016

The compound that makes palm wine taste sour after exposure to the air for few days is

A. Ethanol
B. Ethanoic acid
C. Methanol
D. Methanoic acid