If a gas absorbs 200 J of heat and expands by 500 cm3 against the constant pressure of 2x105 Nm-2 , then the change in internal energy is :

1. -200 J

2. -100J

3. +100J

4. + 300J

Subtopic:  First Law of Thermodynamics |
 70%
From NCERT
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The internal energy of a substance does not depend upon

(1) Translational energy

(2) Vibrational energy

(3) Energy due to the gravitational pull

(4) Rotational energy

Subtopic:  Enthalpy & Internal energy |
 86%
From NCERT
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Internal energy (E) and pressure of a gas of unit volume are related

as

(1) P=23E    

(2) P=32E   

(3)   P=E2     

(4) P=2E

Subtopic:  Enthalpy & Internal energy |
 58%
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Identify the false statement among the following.

1. Temperature is a state function.
2. Work is a state function. 
3. Change in the state is completely defined when the initial and final states are specified​.
4. Work appears at the boundary of the system.

Subtopic:  Thermodynamics' Properties and process |
 87%
From NCERT
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Considering entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is:


1. Ssystem+Ssurroundings>0

2. Ssystem-Ssurroundings>0

3. Ssystem>0 only

4. Ssurroundings>0 only

Subtopic:  Spontaneity & Entropy |
 81%
From NCERT
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For which of the following processes will the entropy increase? 

1. Reaction of magnesium with oxygen to form magnesium oxide

2. Reaction of nitrogen and hydrogen to form ammonia 

3. Sublimation of dry ice

4. Condensation of steam 

Subtopic:  Spontaneity & Entropy |
 79%
From NCERT
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Which of the following is the correct first law thermodynamics equation?

(1) U=Q-W

(2) W=U+Q

(3) U=W+Q

(4) None of these 

Subtopic:  2nd & 3rd Law of Thermodynamics |
 73%
From NCERT
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Which of the following conditions result in a spontaneous reaction?

1. Exothermic and increasing disorder

2. Exothermic and decreasing disorder

3. Endothermic and increasing disorder

4. Endothermic and decreasing disorder

Subtopic:  Spontaneity & Entropy |
 77%
From NCERT
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Assume each reaction is carried out in an open container. For which of the following reactions will H be equal to U?

1. PCl3(g) PCl3(g) +Cl2(g) 

2. 2CO(g) +O2(g) 2CO2(g) 

3. H2(g) +Br2(g) 2HBr(g)

4. C(s) +2H2O(g) 2H2(g) +CO2(g)

Subtopic:  Enthalpy & Internal energy |
 89%
From NCERT
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Links
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ldentify the correct statement regarding entropy.

(1) At absolute zero temperature, entropy of a perfectly crystaline

     substance is +ve.

(2) At absolute zero temperature, entropy of a perfectly crystalline

     substance is taken to be zero 

(3) At absolute zero temperature, entropy of all crystaline sustances

     in taken to be 0.

(4) At 0° C entropy of a perfectly crystalline substance is taken to

      be 0.

Subtopic:  Spontaneity & Entropy |
 77%
From NCERT
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