Waec Chemistry 2019 Past Questions and Answers

Question 31:

• WAEC 2019

An organic compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass. What is the empirical formula of the compound?
[ H = 1.0. C = 12.0, O = 16.0 ]

A. C\(_3\)H\(_8\)O
B. C\(_6\)H\(_12\)O
C. C\(_6\)H\(_12\)O\(_2\)
D. C\(_12\)H\(_12\)O\(_11\)

Question 32:

• WAEC 2019

When excess chlorine is mixed with ethane at room temperature, the product formed is?

A. 1,2-dichloroethane
B. 1,2-dichloroethene
C. 1,1-dichloroethane
D. 1,1-dichloroethene

Question 33:

• WAEC 2019

which of the following reagents could be used to distinguish between propan-1-ol and propan-2-ol

A. H+ / K2Cr2O7
B. I\(_2\) / OH-
C. CH\(_3\)COOH
D. NaCl

Question 34:

• WAEC 2019

If a catalyst is added to a system, the temperature and the pressure remain constant, there would be no effect on the?

A. Activation energy of the reaction
B. Rate of the reaction
C. Rate of the reverse reaction
D. Heat of reaction

Question 35:

• WAEC 2019

consider the following reaction equation: 2NH\(_3 \) .+ 3Cl\(_2\) → N2 + 6HCl.
NH\(_3\) is acting as?

A. A reducing agent
B. A dehydrating agent
C. A drying agent
D. An oxidizing agent