Chemistry chapter 8 Entry Test MCQs
Topic 8
Basic Thermochemistry
1. Identify the intensive quantity from the following:
a. Volume and temperature
b. Enthalpy and temperature
c. Temperature and refractive index
d. Enthalpy and volume
2. Most of thermodynamic parameters are
a. Phase
b. System
c. State functions
d. Surrounding
3. If an endothermic reaction is allowed to take place very rapidly in air, the temperature of the surrounding air will?
a. Either increase or decrease
b. Remains constant
c. Increase
d. Decrease
4. It is general principle that the less energy a system contains, it is
a. More stable
b. Less stable
c. More unstable
d. Unstable
5. The following is NOT endothermic reaction:
a. Decomposition of water
b. Combustion of methane
c. Conversion of graphite to diamond
d. Dehydrogenation of ethane to ethylene
6. Evaporation of water is:
a. An exothermic change
b. An endothermic change
c. A process accompanied by chemical reaction
d. A process where no heat change occurs
7. An exothermic reaction is one which:
a. Is accompanied by a flame
b. Takes place only on heating
c. Is accompanied by evolution of heat
d. Is accompanied by an absorption of heat
8. The environment in which a system is studied is
a. Surrounding
b. State function
c. State
d. Phase
9. A state function which describes together the internal energy and product of pressure and volume is called_______.
a. Work
b. Enthalpy
c. Kinetic energy
d. Internal energy
10. Decomposition of H2O is:
a. Zero nuclear reaction
b. Endothermic reaction
c. Nuclear reaction
d. Exothermic reaction
11. Which one of the following is correct about heat energy?
a. Move from cold to hot body
b. Path function
c. Property of a system
d. state function
12. Energy can be transferred to a system by
a. Heat & work
b. Heat
c. Force
d. work
13. Heat is the energy that flows across the
a. Boundaries of the system
b. Surroundings
c. Never flows
d. Only within the system
14. A reaction which does not occur in nature are
a. Exothermic Reactions
b. Spontaneous Reactions
c. Non-spontaneous Reactions
d. Endothermic Reactions
15. When does it mean, when a reaction is exothermic?
a. Heat is transferred from the Surrounding to the system
b. Energy content of product is more
c. Energy content of reactant is less
d. Heat is transferred from the system to surrounding
16. Which one of the following has positive value?
a. Work done on the system
b. Heat lost by the system
c. Positive ΔE when heat lost by the system
d. Work done by the system
17. Conversion of water into vapours is a
a. Exothermic Reaction
b. Spontaneous Reactions
c. Combustion Reaction
d. Reversible Reaction
18. Identify the state function among the following:
a. q/w
b. q
c. q + w
d. q – w
19. If ΔH has positive sign in the reaction, then it means
a. Enthalpy of products is equal to that of reactants
b. Products are less stable than reactants
c. Reactants are less stable than products
d. Enthalpy of products is lesser than that of reactants
20. Which of the following is not applicable to thermochemical process?
a. It represents heat change
b. It represents chemical change
c. It represents the physical states of reactants and products
d. Spontaniety of reaction
21. Which process is endothermic and spontaneous?
a. Formation of NH3 from H2 and N2
b. Neutralization of NaOH with HCl
c. Evaporation of sea and river water
d. Formation of H2O from H2 and O2
22. When temperature of an exothermic reaction is increased then
a. Rate of reaction is decreased
b. Rate of reaction is increased
c. Yield is increased
d. Energy of activation is decreased
23. All of the followings are state function EXCEPT:
a. Entropy
b. Temperature
c. PΔV
d. Enthalpy
24. Evaporation of water is an exceptional case of:
a. Decomposition
b. Spontaneous
c. Hydrolysis
d. Non-spontaneous
25. Which of the following is not a state function?
a. Amount of substances
b. Pressure
c. Enthalpy
d. Temperature