Chemical Energetics Test Online MCQs

1. Heat of fusion of a molecular solid is:

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

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

4. Heat of reaction:

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

6. 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.

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

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

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

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

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

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

13. 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:

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

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

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

17. I joule is equal to:

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

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

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