Jamb Chemistry 1982 Past Questions and Answers

Question 41:

• JAMB 1982

Which of the following combinations of conditions may increase the rate of a chemical reaction?

A. Decrease in temperature, increase in concentration of the reactants
B. Increase in temperature, addition of a catalyst, decrease in the surface area of the reactants
C. Increase in temperature, increase in concentration, addition of a catalyst and increase in the surface area of the reactants
D. Decrease in temperature concentration and surface area of the reactants
E. Additionof a catalyst and in the absence of light

Question 42:

• JAMB 1982

Which of the following is NOT a redox reaction?

A. 2HNO₂ + 2HI → 2H₂O + 2NO + I₂
B. Zn + H₂SO₄ → ZnSO₄ + H₂
C. Ca(HCO₃)₂ → CaCO₃ + H₂O + CO₂
D. 4FeO + O₂ → 2Fe₂O₃
E. 2Na + Cl₂ → 2NaCl

Question 43:

• JAMB 1982

0.16g of methane when burnt raises the temperature of 100g of water by 40°C. What is the of combustion of methane when if the heat capacity of water is 4.2 Jg^-1°C^-1?
(CH₄ = 16)

A. 1,160 kJ mol^-1
B. 1,180 kJ mol^-1
C. 1,560 kJ mol^-1
D. 1,600kJ mol^-1
E. 1,680 kJ mol^-1

Question 44:

• JAMB 1982

Which of the following processes NOT lead to a chemical change?

A. Strirring iron in sulphur (IV) acid
B. Stirring sodium carbonate in water
C. Stirring glucose in concentrated sulphur (IV) acid
D. Mixing sulphur (IV) acid with potassium carbonate
E. Titrating an acid against base

Question 45:

• JAMB 1982

Brass is an alloy containing copper and?

A. Zinc
B. Tin
C. Aluminium
D. Silver
E. Lead