Energy changes ∆H accompanying physical and chemical changes - Jamb Chemistry Past Questions and Answers

Question 1:

• JAMB 2019

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

A. Thermodynamic
B. Exothermic
C. Isothermal
D. Endothermic
E. Thermostatic

Question 2:

• JAMB 2019

Consider the following exothermic reaction

2SO_2(g) + I_2(g) 2SO_3(g)

If the temperature of the reaction is reduced from to an no other change takes place, then

A. The reaction rate increases
B. Concentration of SO₃ decreases
C. Concentration of SO₃ increases
D. SO₂gas becomes unreactive
E. I₃ gas becomes unreactive

Question 3:

• JAMB 1978

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

A. Thermodynamic
B. Exothermic
C. Isothermal
D. Endothermic
E. Thermostatic

Question 4:

• JAMB 1978

Consider the following exothermic reaction
2SO_2(g) + O_2(g) ↔ 2SO_3(g)
If the temperature of the reaction is reduced from 800°C to 500°C, an no other change takes place, then

A. The reaction rate increases
B. Concentration of SO₃ decreases
C. Concentration of SO₃ increases
D. SO₂ gas becomes unreactive
E. O₃ gas becomes unreactive