The standard entropies of CO2(g), C(s) and O2(g) are 213.5, 5.690 and 205 JK–1 respectively. The standard entropy of formation of CO2(g) is

(1) 1.86 JK–1

(2) 1.96 JK–1

(3) 2.81 JK–1

(4) 2.86 JK–1

Subtopic:  Thermochemistry |
 76%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

Equal volumes of monoatomic and diatomic gases at same initial temperature and pressure are mixed. The ratio of specific heats of the mixture (Cp/Cv) will be [AFMC 2002]

(1) 1

(2) 2

(3) 1.67

(4) 1.5

Subtopic:  Cp & Cv |
 51%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

The unit of entropy is -

1. J mol–1

2. JK mol–1

3. J mol–1 K–1

4. J–1 K–1 mol–1

Subtopic:  Spontaneity & Entropy |
 85%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The entropy changed involved in the conversion of 1 mole of liquid water at 373 K to vapour at the same temperature will be [ΔHvap=2.257kJ/gm] [MP PET 2002]

(1) 0.119 kJ

(2) 0.109 kJ

(3) 0.129 kJ

(4) 0.120 kJ

Subtopic:  Spontaneity & Entropy |
 74%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

When a liquid boils, there is [JIPMER 2002]

(1) An increase in entropy

(2) A decrease in entropy

(3) An increase in heat of vaporization

(4) An increase in free energy

Subtopic:  Spontaneity & Entropy |
 87%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

The work done to contract a gas in a cylinder, is 462 joules. 128 joule energy is evolved in the process. What will be the internal energy change in the process [MP PMT 2003]

(1) + 590 joules

(2) – 334 joules

(3) + 334 joules

(4) – 590 joules

Subtopic:  First Law of Thermodynamics |
 66%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

For a carnot engine, the source is at 500 K and the sink at 300 K. What is efficiency of this engine

(1) 0.2

(2) 0.4

(3) 0.6

(4) 0.3

Subtopic:  Enthalpy & Internal energy |
 76%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

From Kirchhoff's equation which factor affects the heat of reaction [MP PMT 1990]

1. Pressure

2. Temperature

3. Volume

4. Molecularity

Subtopic:  Thermodynamics' Properties and process |
 76%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

The absolute enthalphy of neutralisation of the reaction MgO(s)+2HCl(aq)MgCl2(aq)+H2O(l) will be [CBSE PMT 2005]

(1) Less than –57.33 kJ mol–1

(2) –57.33 kJ mol–1

(3) Greater than –57.33 kJ mol–1

(4) 57.33 kJ mol–1

Subtopic:  Hess's Law |
 58%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints

The heat of transition (ΔHt) of graphite into diamond would be, where

C(graphite)+O2(g)CO2(g);  ΔH=xkJ

C(diamond)+O2(g)CO2(g);  ΔH=ykJ [Pb. PET 1985]

(1) (x+y)kJmol1

(2) (xy)kJmol1

(3) (yx)kJmol1

(4) None of these

Subtopic:  Thermochemistry |
 76%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints