JAMB Chemistry Past Questions, Answers & Explanations - Chemistry

Jamb Chemistry Questions

Question 41:

JAMB 1982

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

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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

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Question 42:

JAMB 1982

Which of the following is NOT a redox reaction?

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

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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)

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