Waec Chemistry 2010 Past Questions and Answers

Question 26:

• WAEC 2010

The rate of chemical reaction of solids are not affected by

A. Catalyst
B. Pressure
C. Particle size
D. Temperature

Question 27:

• WAEC 2010

Which of the following statements about the cell notation Mg/Mg²⁺//Cu²⁺/Cu is correct?

A. Copper is the anode
B. Manesium is reduced
C. Magnesium is the anode
D. The double line represents the electrodes

Question 28:

• WAEC 2010

Which of the following statements about the electrolysis of CuSO_4(aq) using copper cathode and platinum anode is not correct?

A. Copper is deposited at the cathode
B. Oxygen is liberated at the anode
C. It is used for the purification of copper
D. The solution becomes acidic

Question 29:

• WAEC 2010

What is the change in oxidation number of manganes in the reaction represented by the following equation? MnO^-_4(aq) + 8H⁺_(aq) + 5e^- → Mn²⁺_(aq) + 4H₂O_(l)

A. +3 to + 2
B. + 4 to + 2
C. + 5 to + 2
D. + 7 to 2

Question 30:

• WAEC 2010

The quantity of electricity required to discharge 1 mole of univalent ion is

A. 9,600 C
B. 48,250 C
C. 96,500 C
D. 193,00 C