Rates of Chemical Reaction - Jamb Chemistry Past Questions and Answers

Question 56:

• JAMB 2006

One mole of a hydrocarbon contains 36g of carbon and its vapour density is 20. The structure of the hydrocarbon is

A. CH₃C ≡ CH
B. CH₃CH = CH₂
C. CH₃CH₂C ≡ CH
D. CH₃CH₂ CH₃

Question 57:

• JAMB 2006

If 30cm³ of gas at 50^oC is warmed to 80^o at a fixed pressure, the fractional increase in volume is

A. 0.009
B. 0.093
C. 0.910
D. 1.090

Question 58:

• JAMB 2007

Na₂S₂O_3(aq) + 2HCl_(aq) → 2NaCl_(aq) + H₂O_(l)
Which of the following would introduce the greatest increase in the rate of the chemical reaction above?

A. An increase in temperature and decrease in the concentration of the reactant
B. A decrease in the volume and increase in the pressure of the reactant
C. A decrease in the temperature and an incease in the concentration of the reactant
D. An increase in temperature and an increase in the concentration of the reactant

Question 59:

• JAMB 2008

A catalyst speeds up the rate of chemical reaction by

A. Taking part in the reaction
B. Increasing the activation energy of the reaction
C. Lowering the activation energy of the reaction
D. Increasing the heat content

Question 60:

• JAMB 2008

The rate of a reaction usually decrease in the concentration of reactants because

A. Kinetic energy decrease
B. Temperature increase
C. Speed increases
D. Reactants collision decrease