Thermodynamics Test

Result

Thermodynamics Test - 17

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Weekly Quiz Competition

Question 1
4 / -1

In a closed container, a liquid is stirred with a paddle to increase the temperature. Which of the following is true ?

A
∆ E = W ≠ 0 , q = 0

B
∆ E = W = q ≠ 0

C
∆ E = 0 , W = q ≠ 0

D
W = 0 , ∆ E = q ≠ 0

Solution
Question 2
4 / -1

Two moles of helium gas expanded isothermally and irreversible at 27°C form volume 1 dm³ to 1 m³ at constant pressure of 100 k Pa. Calculate the work done.

A
99900 kJ

B
99900 J

C
35464.65 kJ

D
34465.65 J

Solution
Question 3
4 / -1

The sublimation energy of I₂ (s) is 57.3 kJ / mol and the enthalpy of fusion is 15.5 kJ / mol. The enthalpy of vaporisation of I₂ is

A
41.8 kJ / mol

B
- 41.8 kJ / mol

C
72.8 kJ / mol

D
-72.8 kJ / mol
Question 4
4 / -1

When two moles of hydrogen expands isothermally against a constant pressure of 1 atm, at 25° C from 15 L to 50 L, the work done (in litre atm) will be

A
17.5

B
35

C
51.5

D
70
Question 5
4 / -1

The heat of combustion of sucrose, C₁₂ H₂₂ O₁₁ (s) at constant volume is 1348.9 kcal mol^-1 at 25°C, then the heat of reaction at constant pressure when steam is produced

A
-1348.9 kcal

B
-1342.34 kcal

C
+1250kcal

D
None of the above

Solution
Question 6
4 / -1

The standard molar heat of formation of ethane, CO₂ and water (l) are respectively -21.1, - 94.1 and - 68.3 kcal. The standard molar heat of combustion of ethane will be

A
- 372 kcal

B
162 kcal

C
- 240 kcal

D
183.5 kcal
Question 7
4 / -1

The ratio of heats liberated at 298 K from the combustion of one kg of coke and by burning water gas obtained from 1 kg of coke is (Assume coke to be 100% carbon). (Given : enthalpies of combustion of C, CO and H₂ as 393.5 kJ, 285 kJ, 285 kJ respectively all at 298 K)

A
0.79 : 1

B
0.69 : 1

C
0.86 : 1

D
0.96 : 1
Question 8
4 / -1

On complete combustion, 0.246 g of an organic compound gave 0.198 g of CO₂ and 0.1014 g of H₂O. The ratio of carbon and hydrogen atoms in the compound

A
1 : 3

B
1 : 2

C
2 : 5

D
2 : 7
Question 9
4 / -1

The standard enthalpies of formation of CO₂ (g), H₂O(l) and glucose (s) at 25°C are - 400 kJ / mol, -300 kJ / mol and -1300 kJ / mol, respectively. The standard enthalpy of combustion per gram of glucose at 25°C is

A
+ 2900 kJ

B
- 2900 kJ

C
-16.11kJ

D
+ 16.11kJ
Question 10
4 / -1

The enthalpy of combustion of C₆H₆ (l) is - 3250 kJ. When 0.39 g of benzene is burnt in excess of oxygen in an open vessel, the amount of heat liberated is

A
16.25 J

B
16.25 kJ

C
32.5 J

D
32.5 kJ

Solution