An ideal gas can be expanded from an initial state to a certain volume through two different processes, (A) PV2=K (B) P=KV2, where K is a positive constant. Then, choose the correct option from the following.

1. Final temperature in (A) will be greater than in (B)

2. Final temperature in (B) will be greater than in (A)

3. Work done by the gas in both the processes would be equal

4. Total heat given to the gas in (A) is greater than in (B)

Subtopic:  Classification of System, Extensive & Intensive Properties |
 55%
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Heat of hydrogenation of ethene is x1 and that of benzene is x2. Hence resonance energy is-

1. x1-x2

2. x1+x2

3. 3x1-x2

4. x1-3x2

Subtopic:  Thermochemistry |
 69%
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C2H6g+3.5O2g2CO2g+3H2OgSvapH2O, l=x1 cal K-1b.p. +T1HfH2O, l=x2; HfCO2=x3, HfC2H6=x4Hence H for the reaction is-

1. 2x3+3x2-x4

2. 2x3+3x2-x4+3x1T1

3. 2x3+3x2-x4-3x1T1

4. x1T1+x2+x3-x4

Subtopic:  Enthalpy & Internal energy |
 60%
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The bond energies of CC, C-H, H-H, and C=C are 198, 98, 103 and145 kcal respectively.

The enthalpy change of the reaction HCCH+H2C2H4 would be-

1. 48 kcal

2. 96 kcal

3. -40 kcal

4. -152 kcal

Subtopic:  Enthalpy & Internal energy |
 77%
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H2g+12O2gH2Ol

B.E. (H-H) = x1; B.E. (O=O) = x2 B.E. (O-H) = x3

Latent heat of vaporization of water liquid into water vapour = x4, then Hf(heat of formation of liquid water) is-

1. x1+x22-x3+x4

2. 2x3-x1-x22-x4

3. x1+x22-2x3-x4

4. x1+x22-2x3+x4

Subtopic:  Enthalpy & Internal energy |
 55%
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In a process the pressure of a gas is inversely proportional to the square of the volume. If temperature of the gas is increased, then work done on the gas-

1. is positive

2. is negative

3. is zero

4. maybe positive

Subtopic:  Thermodynamics' Properties and process |
 54%
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The enthalpies of formation of CO2(g) and CO(g) at 298 K are in the ratio 2.57 : 1. For the reaction,

CO2g+Cs2 COg, H=172.5 kJ,
Hf of COg is

1. -150.6 kJ mol-1

2. -302.63 kJ mol-1

3. -130.2 kJ mol-1

4. -141.8 kJ mol-1

Subtopic:  Enthalpy & Internal energy |
 75%
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In an adiabatic expansion the product of pressure and volume-

1. decreases

2. increases

3. remains constant

4. first increase then decreases

Subtopic:  First Law of Thermodynamics |
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The molar entropy of the vapourization of acetic acid is\(14.4~ \mathrm{cal}~ \mathrm{K}^{-1} \mathrm{~mol}^{-1}\) at its boiling point 118C. The latent heat of vapourization of acetic acid is-

1. \(49 ~\mathrm{cal}~ \mathrm{g}^{-1} \) 2. \(64 ~\mathrm{cal}~ \mathrm{g}^{-1} \)
3. \(94 ~\mathrm{cal}~ \mathrm{g}^{-1} \) 4. \(84 ~\mathrm{cal}~ \mathrm{g}^{-1} \)
Subtopic:  Spontaneity & Entropy |
 59%
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100 ml of 0.3 M HCl solution is mixed with 100 ml of 0.35 M NaOH solution. The amount of heat liberated is

1. 7.3 kJ

2. 5.71 kJ

3. 10.42 kJ

4. 1.713 kJ

Subtopic:  Enthalpy & Internal energy |
 54%
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