Waec Chemistry 2013 Past Questions and Answers

Question 26:

• WAEC 2013

Which of the following gases are arranged in increasing order of diffusion rate? [H = 1 .0; C = 12; N = 14; O = 16; S = 32]

A. SO ₂ O₂, NH₃ H₂
B. H₂S,NH₂,O₂,SO₂
C. CO₂,N₂O,O₂,SO₂
D. NH₃,NO₂,N₂,CO₂

Question 27:

• WAEC 2013

Which of the following variables is a measure of the average kinetic energy of the molecule of a gas?

A. Density
B. Pressure
C. Temperature
D. Volume

Question 28:

• WAEC 2013

When heat is absorbed during a chemical reaction, the reaction is said to be

A. Adiabatic
B. Endothermic
C. Exothermic
D. Isothermal

Question 29:

• WAEC 2013

The aqueous solution which has pH > 7 is

A. FeCI_3(aq)
B. CuSO_4(aq)
C. KNO_3(aq)
D. Na₂CO_3(aq)

Question 30:

• WAEC 2013

Which of the following acids would readily react with CaCO3 to liberate CO2?

A. CH₃COOH
B. H₂SO₄
C. H₂SO₃
D. HNO₃