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Important Questions on Thermodynamics
1. For an ideal gas, the isochoric temperature-based pressure change coefficient is equal to:
3. Which of the following relations is correct?
4. The value of isothermal compressibility factor at the critical point is,
A. Zero
B. Infinite
C. 1
D. Any number
5. A gas expands from a volume of 3.0 dm3 to 5.0 dm3 against a constant external pressure of 3.0 atm. The work done during the expansion is used to heat 10.0 ml of water of temperature 290.0K. Calculate the final temperature of the water.
(Specific heat of water = 4.184 Jg–1K–1)
A. 0.81 K
B. 0.81º
C. 20.67º
D. 273 K
6. Calculate the enthalpy change on freezing of 1.0 mol of water at 10ºC to the ice at –10ºC.
= 6.03 kJ mol–1 at 0ºC
CP[H2O(l)] = 75.3 J mol–1k–1
CP[H2O(s)] = 36.8 J mol–1k–1
A. 6.26 kJ mol–1
B. 0
C. –7.15 kJ mol–1
D. 7.15 kJ mol–1
7. Vapor pressures of water at 95ºC and 100ºC are 634 and 760 mm respectively. Calculate the molar heat of vaporization, of water between 95ºC and 100ºC.
A. –41.363 kJ mol–1
B. 41.363 kJ mol–1
C. 63.46 kJ mol–1
D. –63.46 kJ mol–1
8. How many calories are required to heat 40 grams of argon from 40ºC to 100ºC at constant volume? {R = 2 Call mol k}
A. 120
B. 2400
C. 1200
D. 180
9. The molar heat capacity of water in equilibrium with ice at constant pressure is:
A. 0
B. 40.50 KJ K–1 mol–1
C. Infinity
D. 75.48 JK–1 mol–1
10. For the reaction A B, = +24 kJ/mol for the reaction B C, = –18 kJ/mole the decreasing order of enthalpy of A, B, C follows the order:
A. A, B, C
B. B, C, A
C. C, B, A
D. C, A, B
Answer Keys
- A
- D
- B
- B
- B
- C
- B
- D
- C
- B
Solutions
Solution 1:
Solution 2:
Solution 3:
Solution 4:
Solution 5:
Solution 6:
Solution 7:
Solution 8:
For a monatomic gas like Ar, CV = 3 Cal mol–1 and CP = 5 Cal mol–1.
As 40 g of argon = 1 mole
Hence, the heat is required to raise the temperature from 40ºC to 100ºC at constant volume
= 3 × (100 – 40) = 180 Cal.
Solution 9:
Solution 10:
Most Important Questions on Thermodynamics - Download PDF Now
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