Chapter 5 – Multiple Choice Questions

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Multiple Choice Questions

1. The branch of chemistry which deals with thermal energy changes in chemical reactions is called.

(i) Chemical kinetic

(ii) Thermodynamics

(iii) Thermo chemistry

(iv) Mechanics

 

2. If heat is evolved in the reaction, the process is said to be

(i) Endothermic

(ii) Exothermic

(iii) Isothermal

(iv) Adiabatic

 

3. If heat is absorbed in the reaction, the process is said to be

(i) Exothermic

(ii) isothermal

(iii) Adiabatic

(iv) Endothermic

4. The amount of heat evolved or absorbed in a chemical reaction, when the molar quantities of products and reactants being the same as represented in chemical equation is called:

(i) Heat of reaction

(ii) Free energy of reaction

(iii) Entropy of reaction

(iv) None of these

 

5. The branch of science which deals with energy transformation is known as

(i) Thermochemsitry

(ii) Kinetics

(iii) Photochemistry

(iv) Thermodynamics

 

6. The total energy contained within a chemical system is called its

(i) Enthalpy

(ii) Internal energy

(iii) Kinetic energy

(iv) Potential energy

 

7. Which property depends on the state of a system?

(i) Enthalpy

(ii) Free energy

(iii) Entropy

(iv) All of the above

 

8. The energy required to break one mole of bonds to form neutral atoms is called

(i) Bond length

(ii) Bond strength

(iii) Bond energy

(iv) None of these

 

9. The mathematical form of first law of thermodynamics is

(i) ∆E = q – w

(ii) ∆E = q + w

(iii) W = ∆E + q

(iv) Q = ∆E + w

10. Work is a product of force and

(i) Displacement

(ii) Area

(iii) Time

(iv) Volume

 

11. A H is equal to

(i) E + PV

(ii) E+ P ∆ V

(iii) ∆ E +P

(iv) ∆ E+ P∆ V

 

12. The amount of heat evolved or absorbed in a process is the same whether the process takes place in one or several steps is the statement of

(i) First law of thermodynamics

(ii) Hess’s Law

(iii) Coulomb’s law

(iv) Phase law

 

13. By applying Hees’s law, we can calculate

(i) ∆ H

(ii) ∆ S

(iii) ∆ F

(iv) K

 

14. Energy can neither be created nor destroyed, although it can be transformed from one from to another. This is a statement of

(i) Law of conservation of matter

(il) Law of definite proportions

(iii) Law of conservation of energy

(iv) None of these

 

15. ∆H for an exothermic reaction carries

(i) Positive sign

(ii) Negative sign

(iii) Both signs

(iv) None of these

 

16. ∆H for an endothermic reaction carries.

(i) Positive sign

(ii) Negative sign

(ill) Both signs

(iv) None of these

 

17. Concentration of reactant with the passage of time in chemical reactions

(i) Increase

(ii) Decreases

(iii) Remains the same

(iv) None of these

 

18. The environment containing the system is called:

(i) State

(ii) Surroundings

(iii) System

(iv) All of these

 

19. Internal energy ∆ E of a system is a state function and depends only.

(i) A amount of substance

(ii) Steps of the reaction

(iii) On the initial and final states of the system

(iv) All of these

 

20 The state of system can be defined completely by which of the following properties:

(i) Volume

(ii) Pressure

(iii) Temperature

(iv) All of the above properties taken together

 

21. Which one is the intensive property?

(i) Density

(ii) Mass

(iii) Mole

(iv) Volume

 

22. Which one is extensive property?

(i) Surface tension

(ii) Viscosity

(iii) Refractive index

(iv) Gibbs free energy

 

23. The change in quantity of energy is represented by:

(i) ∆ G

(ii) ∆ H

(iii) ∆ T

(iv) ∆ S

24. Heat absorb at constant volume is

(i) q = E + P A \/

(ii) q = A E

(iii) C; 73 A ‘JSE

(iv) q = qg- q1

 

25. Heat absorb at constant pressure I

(i) qp = ∆ H

(ii) q p = E2 + Pr2

(iii) q p = E1 + PV1

(iv) qp =  H 2

 

26. Hess’s law is useful where direct measurement of enthalpy is

(i) Feasible

(ii) Not of feasible

(iii) Change

(iv) Constant

27. The heat change when one mole of a solid substance is converted into the liquid state at its melting point is called

(i) Heart of crystal

(ii) Melting point

(iii) Heat of fusion

(iv) Heat of molten

 

28. The heat change when one mole of a solid is directly convened into the gaseous state at a temperature below is melting point is called:

(i) Heat of formation

(ii) Heat of vaporization

(iii) Heat of combustion

(iv) Heat of sublimation

 

29. For a reaction :

H2+ Cl2 ——> 2 H C l

 

30. The change in enthalpy which is released or absorbed its ∆ H = 52 KJ /mole

(i) Heat of formation

(ii) Heat of reaction

(iii) Heat of neutralization

(iv) Heat of combustion

 

31. If 6000 cells of heat if added to a system which system does work equivalent to of 800 cals by expanding against the surrounding. What is the value of ∆ E for the system.

(i) 200

(ii) – 200

(iii) 1400

(iv) -1400

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