# In a flask, colourless N2O4(g) is in equilibrium with brown coloured NO2(g). At equilibrium when the flask is heated to 100$°$C, the brown colour deepens and on cooling it becomes less coloured. Which statement is incorrect about this observation? 1. The $∆$H for the reaction N2O4(g)$⇌$ 2NO2(g) is +ve 2. Paramagnetism increases on heating 3. The $∆$H-$∆$U at 100$°$C is equal to 200 cal 4. Dimerisation is reduced on heating

Subtopic:  First Law of Thermodynamics |
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Enthalpy of the reaction,

CH4(g) + 1/2O2(g) CH3OH(l), is negative. If the enthalpy of combustion of CH4 and CH3OH are x and y respectively, then
which relation is correct?

1. x>y

2. x<y

3. x=y

4. x$⩾$y

Subtopic:  Enthalpy & Internal energy |
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In the reaction, $∆$H and $∆$S both are positive. The condition under which the reaction would not be spontaneous is -

1. $∆$H>T$∆$S

2. $∆$S=$∆$H/T

3. $∆$H=T$∆$S

4. All of the above

Subtopic:  Gibbs Energy Change |
54%
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When an ideal gas is compressed adiabatically and reversibly, the final temperature is:

1. higher than the initial temperature

2. lower than the initial temperature

3. the same as the initial temperature

4. dependent on the rate of compression

Subtopic:  First Law of Thermodynamics |
56%
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1 liter-atmosphere is equal to:

1. 101.3 J

2. 24.20 cal

3. 101.3 x 107 erg

4. All of the above

Subtopic:  First Law of Thermodynamics |
69%
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The standard change is Gibbs energy for the reaction,

H2O$⇄$H+ + OH- at 25$°$C is:

1. 100 kJ

2. -90 kJ

3. 90 kJ

4. -100 kJ

Subtopic:  Spontaneity & Entropy |
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The entropy change in the fusion of one mole of a solid melting at 27$°$C  is  -

(the latent heat of fusion is 2930 J mol-1)

1. 9.77 JK-1mol-1

2. 19.73 JK-1mol-1

3. 2930 JK-1mol-1

4. 108.5 JK-1mol-1

Subtopic:  Spontaneity & Entropy |
80%
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The maximum work done in expanding 16 g of oxygen at 300 K and occupying a volume of 5 dm3 isothermally until the volume becomes 25 dm3 is:

1. -2.01 x 103 J

2. 2.81 x 103 J

3. 2.01 x 10-3 J

4. -2.01 x 10-6 J

Subtopic:  2nd & 3rd Law of Thermodynamics |
58%
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1 mole of an ideal gas at 25$°\mathrm{C}$ is subjected to expand reversibly ten times of its initial volume. The change in entropy of expansion is:

1. 19.15 JK-1mol-1

2. 16.15 JK-1mol-1

3. 22.15 JK-1mol-1

4. None of the above

Subtopic:  Spontaneity & Entropy |
65%
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For the process

H2O(l) $\to$H2O(g)

at T=100$°$C and 1 atmosphere pressure, the correct choice is:

1.

2.

3.

4.

Subtopic:  Spontaneity & Entropy |
55%
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