Rates of Chemical Reaction - Jamb Chemistry Past Questions and Answers

Question 1:

• JAMB 2019

If 30cm3 of oxygen diffuses through a porous pot in 7 seconds, how long will it take 60cm3 of chlorine to diffuse through the same pot, if the vapour densities of oxygen and chlorine are 16 and 36 respectively?

A. 9.3 sec
B. 14 sec
C. 21 sec
D. 28 sec
E. 30.3 sec

Question 2:

• JAMB 2019

Which of the following gases will diffuse fastest when passed through a porous plug?
[H = 1, C = 12, N = 14, O = 16]

A. Propane
B. Oxygen
C. Methane
D. Ammonia

Question 3:

• JAMB 2019

Which of the following factors will speed up the rate of evolution of carbon (iv) oxide in the reaction below?
2HCl + CaCO₃ → CaCl₂ + H₂O + CO₂

A. Increasing the concentration of the acid
B. Increasing the surface area of CaCO₃
C. A and B
D. Reducing the concentration of the acid

Question 4:

• JAMB 2019

Hydrogen diffused through a porous plug

A. Thrice as fast as oxygen
B. At the same speed as oxygen
C. Four times as fast as oxygen
D. Twice as fast as oxygen

Question 5:

• JAMB 1978

If 30cm³ of oxygen diffuses through a porous pot in 7 seconds, how long will it take 60cm³ of chlorine to diffuse through the same pot, if the vapour densities of oxygen and chlorine are 16 and 36 respectively?

A. 9.3 sec
B. 14 sec
C. 21 sec
D. 28 sec
E. 30.3 sec