The gas absorbs 100 J heat and is simultaneously compressed by a constant external pressure of 1.50 atm from 8 lit. to 2 lit. in volume. Hence E will be-

1. -812 J

2. 812 J

3. 1011 J

4. 911 J

Subtopic:  Enthalpy & Internal energy |
 60%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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If G=H-TS and G=H+TdGdTP then variation of EMF of a cell E, with temperature T, is given by

1. HnF 

2. GnF

3. SnF

4. -SnF

Subtopic:  Gibbs Energy Change |
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NEET 2023 - Target Batch - Aryan Raj Singh
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The standard heat of combustion of Al is -837.8 kJ mol-1 at 25C which of the following releases 250 kcal of heat ?

1. The reaction of 0.624 mol of Al

2. The formation of 0.624 mol of Al2O3

3. The reaction of 0.312 mol of Al

4. The formation of 0.150 mol of Al2O3

Subtopic:  Thermochemistry |
 60%
From NCERT
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CP-CV=R. This R is :

1. Change in K.E.

2. Change in rotational energy

3. work done which system can do on expanding the gas per mol per degree increase in temperature

4. All correct

Subtopic:  Cp & Cv |
 64%
From NCERT
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Heat of neutralisation of oxalic acid is -25.4 K cal mol-1 using strong base, NaOH. Hence enthalpy change of the process is H2C2O42H++C2H42- is-

1. 2.0 kcal

2. -11.8 kcal

3. 1.0 kcal

4. -1.0 kcal

Subtopic:  Thermochemistry |
From NCERT
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5 moles of nitrogen gas are enclosed in an adiabatic cylindrical vessel. The piston itself is a rigid light cylindrical container containing 3 moles of Helium gas. There is a heater which gives out a power 100 cal to the nitrogen gas. A power of 30 cal is transferred to Helium through the bottom surface of the piston.

The rate of increment of temperature of the nitrogen gas assuming that the piston moves slowly :

1. 2K/sec

2. 4K/sec

3. 6K/sec

4. 8K/sec

Subtopic:  Cp & Cv |
From NCERT
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During the isothermal mixing of ideal gases at pressure, p, the entropy change per mole for the mixing process is-R xi ln xi where x1, x2,....,xi are the mole fractions of the components, 1, 2,....,i of the mixture. Assuming ideal gas behavior, calculate S for the mixing of 0.8 mole of N2 and 0.2 mole of O2.(at 25C and 0.9 atm) [1 eu = cal/deg]

1. 0.9943 eu

2. 0.7533 eu

3. 0.6798 eu

4. 0.7112 eu

Subtopic:  Spontaneity & Entropy |
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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