In a process the pressure of a gas is inversely proportional to the square of the volume. If temperature of the gas is increases, then work done on the gas-

1. is positive

2. is negative

3. is zero

4. may be positive

Concept Questions :-

Thermodynamics' Properties and process
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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. -109.8 kJ mol-1

3. -130.2 kJ mol-1

4. -141.8 kJ mol-1

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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

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The molar entropy of vapourisation of acetic acid is 144.4 cal K-1 mol-1 at its boiling point 118C. The latent heat of vapourisation of acetic acid is

1. 49 cal g-1

2. 64 cal g-1

3. 94 cal g-1

4. 84 cal g-1

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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

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Five moles of ideal gas expand isothermally and reversibly from an initial pressure of 100 atm to a final pressure of 1 atm at 27C. The work done by the gas is

1. 3455 cal

2. 6909 cal

3. 0

4. 69010 cal

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The quantity δq i.e. heat absorbed an infinitesimal process is

1. Dependent on the path of transformation

2. Dependent on the thermodynamic state of the system

3. Independent of both

4. An exact differential

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An ideal gas absorbs 2000 cals of heat from a heat reservoir and does mechanical work equivalent 4200 J. The change in internal energy of the gas is

1. 3000 cals

2. 2000 cals

3. 1500 cals

4. 1000 cals

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For an ideal gas four processes are marked as 1, 2, 3 and 4 on P-V diagram as shown in figure. The amount of heat supplied to the gas in the process 1, 2, 3 and 4 are Q1, Q2, Q3 and Q4 repectively, then correct order of heat supplied to the gas is

[AB is process-1, AC is process-2, AD is adiabatic process-3 and AE is process-4]

1. Q1>Q2>Q3>Q4

2. Q1>Q2>Q4>Q3

3.  Q1>Q4>Q2>Q4

4. Q1<Q2<Q3<Q4

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The latent heat of vapourisation of water at 25C is 10.5 kcal mol-1 and the standard heat of formation of liquid water is -68.3 kcal. The enthalpy change of the reaction

H2g+1/2O2gH2Og is therefore,

1. -57.8 kcal

2. -78.8 kcal

3. 78.8 kcal

4. -47.3 kcal

Concept Questions :-

Enthalpy and It's Type
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