Consider the following diagram for a reaction AC


      

The nature of the reaction is-

1. Exothermic

2. Endothermic

3. Reaction at equilibrium

4. None of the above

Subtopic:  Enthalpy & Internal energy |
 81%
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Consider the following diagram for a reaction AC:

The nature of the reaction is-

1. Exothermic 2. Endothermic
3. Reaction at equilibrium 4. None of the above
Subtopic:  Enthalpy & Internal energy |
 82%
From NCERT
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An enthalpy diagram for a particular reaction is given below:

 

The correct statement among the following is-

1. Reaction is spontaneous

2. Reaction is non-spontaneous

3. Cannot predict spontaneity of the reaction from the graph given above

4. None of the above

Subtopic:  Spontaneity & Entropy |
 50%
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1.0 mol of a monoatomic ideal gas is expanded from state (1) to state (2) as shown in the graph below:

The work done for the expansion of gas from state (1) to state (2) at 298 K will be

1. 1617.6 J

2. -1617.6 J

3. 1717.6 J

4. -1717.6 J

Subtopic:  First Law of Thermodynamics |
 59%
From NCERT
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Match the item in column I and in column II.
 
Column I Column II
a. No heat is absorbed by the system from the surroundings, but work (w) is done on the system. i. ∆U = q – w, closed system.
b. No work is done on the system, but q amount of heat is taken out from the system and given to the surroundings. ii. ∆U = wad, a wall is adiabatic
c.  w amount of work is done by the system and q amount of heat is supplied to the system. iii. ∆U  = –q, thermally conducting walls
 
1. a = i; b=ii; c=iii
2. a = ii; b=i; c=iii
3. a = ii; b=iii; c=i
4. a = iii; b=ii; c=i
Subtopic:  First Law of Thermodynamics |
 82%
From NCERT
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The incorrect statement(s) among the following statements is/are -

i. When liquid crystallizes into a solid, entropy increases.
ii. When the temperature of a crystalline solid is raised from 0 K to 115 K then entropy increases.
iii. 2 NaHCO3 (s) →Na2CO(s) +CO2(g)+H2O(g); Entropy  increases.
iv. H2(g)→2H(g) ; Entropy  decreases.


1. (i), (iv)
2. (ii), (iv)
3. (iii), (iv)
4. (i), (iii)

Subtopic:  Spontaneity & Entropy |
 82%
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For one mole of an ideal gas, which of these statements must be true?
(I) U and H each depend only on temperature.
(II) Compressibility factor z is not equal to 1.
(III) CP, m – CV, m = R
(IV) dU = CVdT for any process.
1. (I), (III) and (IV)
2. (II), (III) and (IV)
3. (III) and (IV)
4. (I) and (III)

Subtopic:  Enthalpy & Internal energy |
 57%
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Consider the following graph.

  

The work done shown by the above-mentioned graph is-

1. Positive 2. Negative
3. Zero 4. Cannot be determined
Subtopic:  First Law of Thermodynamics |
 70%
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For the graph given below, it can be concluded that work done during the process shown will be-

1. Zero 2. Negative
3. Positive 4. Cannot be determined
Subtopic:  First Law of Thermodynamics |
 65%
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For a given reaction - 2 Zn(s)+O2(g)2ZnO(s), 
H=-693.8 kJ mol-1

The correct statements among the following are :

a. The enthalpy of two moles of ZnO is less than the total enthalpy of two moles of Zn and one mole of oxygen by 693.8 kJ
b. The enthalpy of two moles of ZnO is more than the total enthalpy of two moles of Zn and one mole of oxygen by 693.8 kJ
c. 693 . 8   kJ mol -1  energy is evolved in the reaction
d. 693 . 8   kJ mol -1  energy is absorbed in the reaction

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, c)

Subtopic:  First Law of Thermodynamics |
 69%
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