Thermodynamics Test

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Thermodynamics Test - 49

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following processes is accompanied by an increase in entropy ?

A
Normal rubber band to stretched rubber band

B
Normal egg to hard boiled egg

C
Decomposition of N₂O₅ to N₂O to O₂

D
Formation of NH₃ for N₂H₂
Question 2
4 / -1

Which of the following does not exhibit zero entropy at absolute zero

A
Benzene

B
Glass

C
Pyridine

D
CCl₄
Question 3
4 / -1

The favourable conditions for a spontaneous reaction are

A
T∆S > ∆H, ∆H = +ve, ∆S = +ve

B
T∆S > ∆H, ∆H = +ve, ∆S = –ve

C
T∆S = ∆H, ∆H = –ve, ∆S = –ve

D
T∆S = ∆H, ∆H = +ve, ∆S = +ve
Question 4
4 / -1

A block of ice at –10 °C is slowly heated and converted into steam at 100°C .Which of the following curves represents the phenomenon qualitatively ?

A

B

C

D
Question 5
4 / -1

On passing CO₂ gas in water, its entropy

A
Remains constant

B
Decreases

C
Increases

D
May increase or decrease
Question 6
4 / -1

When does the reaction occur spontaneously on the basis of the relation ∆G° = –RT/nK?

A
K = 0

B
K = 1

C
K > 1

D
K < 1
Question 7
4 / -1

In thermodynamics, a process is called reversible when,

A
Surroundings and system change into each other

B
The surroundings are always in equilibrium with the system

C
The system changes into the surroundings spontaneously

D
There is no boundary between system and surroundings
Question 8
4 / -1

Under certain conditions, the value of ∆G for a hypothetical reaction, X + Y → Z is greater than zero, then –

A
The reaction has tendency to proceed towards Z

B
The reaction has attained equilibrium

C
increase in temperature increases the yield of product Z

D
X and Y predominate in the final mixture
Question 9
4 / -1

For which of the following processes will energy be absorbed –

A
Separating an electron from an electron

B
Separating proton from a proton

C
Separating a neutron from neutron

D
Separating an electron from neutral atom
Question 10
4 / -1

For the combustion of 1 mole of liquid benzene at 25ºC, the heat of reaction at constant pressure is given by, C₆H₆(l) + 7 O₂ (g) → 6CO₆ (g) + 3H₆O (l); ∆H = –780980 cal.
What would be the heat of reaction at constant volume?

A
–780090 cal

B
–780890 cal

C
–780000 cal

D
–780900 cal