Chemistry 1999 Waec Past Questions and Answers

Question 31 :

• WAEC 1999

Which of the following is not correct about oxidation number convention? The oxidation number of a/an

A. Element in the free state is zero
B. Monatomic ion is equal to its charge
C. Alkali meta like sodium in its compounds is + 1
D. Atom of a diatomic molecules is + 2

Question 32 :

• WAEC 1999

Equal volumes of water were added to one mole of each of the following compounds. Which of them produced the largest number of ions

A. Glucose
B. Sodium trioxonitrate (V)
C. Ethananoic acid
D. Silver chloride

Question 33 :

• WAEC 1999

When dilute copper (ll) chloride solution is electrolysed, the reaction at the cathode is represented by the equation

A. Cu → Cu²⁺ + 2e-
B. Cu²⁺ + 2e- → Cu
C. 40H- - 4e- → O₂ + 2H₂O
D. 2CI- → CI₂ + 2e

Question 34 :

• WAEC 1999

How many carbon atoms are present in one molecule of 2-methylpropane?

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

Question 35 :

• WAEC 1999

Which of the following is the most reactive towards bromine?

A. Methane
B. Benzene
C. Ethyne
D. Hexane