Chemical Energetics Test Online MCQs

1. The heat change taking place in the reaction H₂O(l) → H₂O(g), ΔHᶠH₂O(g) = -57 kcal ΔHᶠH₂O(l) = -68.3 kcal is:

2. C + O₂ → CO₂, ΔH1 = -394 kJ mol-1 2CO + O₂ → 2CO₂, ΔH₂ = -569kJ
ΔH for 1 mole formation of CO is:

3. Heat of reaction between sodium hydroxide and hydrochloric acid 57.32kJ mol-1. So heat dissociation of water is:

4. The enthalpy of the elements in their standard states is taken as zero. So the enthalpy of formation of a compound may be:

5. Heat of reaction:

6. The total heat content of a system is known as:

7. The apparatus used for measuring the heat changes is known as:

8. A person requires 2870 kcal of energy of leading a normal life. If heat of combustion of cane sugar is -1349 kcal the must consume …………. Kg of cane sugar daily.

9. The heat of neutralization of a strong acid and a strong base is equal to …………. Kacl gm eq-₁

10. Heat of neutralization of HCl and NaOH is -57.32 kJ per gram equivalent and that of acetic acid and NaOH is -55.23 kJ per gram equivalent. The heat of dissociation of acetic acid per gram equivalent should be:

11. In the reaction:
CO₂(g) + H₂(g) → CO (g) H₂O(g)
ΔH = 2.8 kJ     then ΔH represents

12. Heat of combustion of methane and ethane are -291.7 kcal & -441.2 kacl respectively:

13. The highest temperature at which vapour pressure of a liquid can be measured is:

14. When a liquid is converted into vapours there is:

15. Internal energy of the elements is as signed a value of ………….. cal per mole at standard status.

16. The factor that does not influence the heat of reaction is:

17. The solution energy of Al⁺⁺⁺ ion is more than that of Mg⁺⁺ due to:

18. Heat of fusion of a molecular solid is:

19. I joule is equal to:

20. If temperature is kept constant during the reaction, the process is said to be …………….