Waec Chemistry 2013 Past Questions and Answers

Question 36:

• WAEC 2013

Consider the redox reaction as represented by the following equation: 1_2(aq) + 2S₂O₃^2-_(aq) → 21^-_(aq) + S₄O₆^2-_(aq). Which of the species in the equation is reduced?

A. S₄O₆^2-_(aq)
B. S₄O₃^2-_(aq)
C. 1_2(aq)
D. 1^-_(aq)

Question 37:

• WAEC 2013

The separation of petroleum fractions depends on the differences in their

A. Melting points
B. Molar masses
C. Solubilities
D. Boiling points

Question 38:

• WAEC 2013

The major product formed by the reaction between ethanoic acid and aqueous sodium hydroxide is

A. Soap
B. Sodium ethanoate
C. Sodium methoxide
D. Water

Question 39:

• WAEC 2013

Which of the following organic compounds would decolourize bromie water?

A. Benzene
B. Cyclobutane
C. Hexane
D. Pentane

Question 40:

• WAEC 2013

How many isomers has C ₃H ₆CI ₂?

A. 2
B. 3
C. 4
D. 5