A system is changed from state A to state B by one path and from B to A by another path. If E1 and E2 are the corresponding changes in internal energy, then [Pb. PMT 2001]

1. E1+E2=ve

2. E1+E2=+ve

3. E1+E2=0

4. None of the above

Subtopic:  2nd & 3rd Law of Thermodynamics |
 72%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

If (i) C+O2CO2, (ii) C+1/2O2CO, (iii) CO+1/2O2CO2, the heats of reaction are Q, –12, –10 respectively. Then Q = [Orissa JEE 2004]

(1) – 2

(2) 2

(3) – 22

(4) – 16

Subtopic:  Hess's Law |
 79%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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Adsorption of gases on a solid surface is generally exothermic because [IIT JEE (Screening) 2004]

1. Enthalpy is positive

2. Entropy decreases

3. Entropy increases

4. Free energy increase

Subtopic:  Spontaneity & Entropy |
 74%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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Two mole of an ideal gas is expanded isothermally and reversibly from 1 litre ot 10 litre at 300 K. The enthalpy change (in kJ) for the process is [IIT JEE (Screening) 2004]

1. 11.4 kJ

2. –11.4 kJ

3. 0 kJ

4. 4.8 kJ

Subtopic:  Cp & Cv |
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

When a gas undergoes adiabatic expansion, it gets cooled due to -

1. Loss of energy

2. Fall in pressure

3. Decrease in velocity

4. Increase in energy with work done

Subtopic:  Thermodynamics' Properties and process |
 52%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

In an isobaric process, the ratio of heat supplied to the system (dQ) and work done by the system (dW) for diatomic gas is [AFMC 2002]

(1) 1 : 1

(2) 7 : 2

(3) 7 : 5

(4) 5 : 7

Subtopic:  Cp & Cv |
 55%
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

If for a given substance melting point is TB and freezing point is TA, then correct variation shown by graph between entropy change and temperature is [DCE 2001]

(1)

(2)

(3)

(4)

Subtopic:  Spontaneity & Entropy |
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

The amount of heat measured for a reaction in a bomb calorimeter is

1. ΔG

2. ΔH

3. ΔE

4. PΔV

Subtopic:  Thermodynamics' Properties and process |
 51%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A Beckmann thermometer is used to measure -

1. High temperature

2. Low temperature

3. Normal temperature

4. All temperatures

Subtopic:  Thermodynamics' Properties and process |
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NEET 2023 - Target Batch - Aryan Raj Singh
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The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25°C increases the temperature of 18.94 kg of water by 0.632°C. If the specific heat of water at 25°C is 0.998 cal/g-deg, the value of the heat combustion of benzoic acid is

(1) 771.1 kcal

(2) 871.2 kcal

(3) 881.1 kcal

(4) 981.1 kcal

Subtopic:  Enthalpy & Internal energy |
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NEET 2023 - Target Batch - Aryan Raj Singh
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