Waec Chemistry 2019 Past Questions and Answers

Question 41:

• WAEC 2019

Biotechnology is applied in the?

A. Treatment of sewage
B. Treatment of water
C. Purification of chemicals
D. Purification of metals

Question 42:

• WAEC 2019

which of the following organic compounds has the lowest boiling point?

A. C\(_6\)H\(_14\)
B. C\(_5\)H\(_12\)
C. C\(_4\)H\(_10\)
D. ( CH\(_3\) )\(_3\)

Question 43:

• WAEC 2019

Consider the following reaction represented by the following equation: C\(_2\)H\(_2\) \(^{H\(_2\)}_{→}\) X \(^{H\(_2\)}_{→}\) Y. X and Y respectively are?

A. Ethane and ethene
B. Ethene and ethane
C. Ethyne and ethene
D. Ethane and ethyne

Question 44:

• WAEC 2019

Which of the following substances can be classified as heavy chemicals?

A. CaOCl\(_2\)
B. H\(_2\)SO\(_4\)
C. AgNO\(_3\)
D. CaO

Question 45:

• WAEC 2019

in Boyle's law?

A. T is constant, P varies directly with V
B. P is constant, V varies inversely with T
C. V is constant, P varies directly with T
D. T is constant, V varies inversely with P