Waec Chemistry 2014 Past Questions and Answers

Question 41:

• WAEC 2014

Which of the following organic compounds could be represented by the empirical formula CH₂O?

A. Ethanal
B. Ethane
C. Ethanol
D. Ethanoic acid

Question 42:

• WAEC 2014

The production of biogas from the fermentation of waste materials is an example of

A. Combustion
B. Incineration
C. Refining
D. Recycling

Question 43:

• WAEC 2014

The purity of a solid sample can best be determined by its

A. Boiling point
B. Melting point
C. Conductivity
D. Solubility

Question 44:

• WAEC 2014

Which of the following gases is used to retard the vaporization of the filament in a light bulb?

A. Argon
B. Helium
C. Hydrogen
D. Oxygen

Question 45:

• WAEC 2014

The most common process in the extraction of metals from their ore is

A. Catalysis
B. Electrolysis
C. Oxidation
D. Reduction