MCQs on Free Energy and Work Function

MCQs on Free Energy and Work Function

1. If the standard free energy change for a reaction is 1.546 kJ/mol at 500^oC then the value of the standard equilibrium constant for the reaction is

1. antilog (0.105)
2. antilog (-0.105)
3. antilog (0.241)
4. antilog (-0.241)

Answer: (b)

2. The standard free energy of formation of NO(g) is

1. 84.8 kJ/mol
2. 86.8 kJ/mol
3. 88.8 kJ/mol
4. 90.8 kJ/mol

Answer: (b)

3. The term R ln K_P^o is equal to

1. – ∆G
2. – ∆G^o
3. – ∆G/T
4. – ∆G^o/T

Answer: (d)

4. If one gram of kerosene liberates 46.0 kJ of heat when it is burned, to what temperature can 0.25g of kerosene raise the temperature of 75 cm³ of water at 25^oC?

1. 61.6^oC
2. 46.0^oC
3. 66.1^oC
4. 64.0^oC

Answer: (a)

5. Which of the following statements regarding entropy is not true?

1. S (monoclinic) > S (rhombic)
2. C (diamond) > C (graphite)
3. H₂O(g) > H₂O(l)
4. O₃(g) > O₂(g)

Answer: (b)

6. Which of the following is expressed to have the largest bond dissociation enthalpy?

1. HF
2. HCl
3. HBr
4. HI

Answer: (a)

7. During an isothermal expansion of an ideal gas which of the following is true for the gas?

1. enthalpy decreases
2. entropy decreases
3. enthalpy remains constant
4. entropy remains constant

Answer: (c)

8. For a spontaneous process, the change in Gibbs function is equal to the

1. the heat content of the system
2. entropy change of the system
3. work of expansion
4. useful work

Answer: (d)

9. Which of the following is an extensive property?

1. surface area
2. pressure
3. molar volume
4. concentration

Answer: (a)

10. Which of the following is a state function?

1. q
2. w
3. q_rev/T
4. qw

Answer: (c)