Thermodynamics is not concerned about-

1. Energy changes involved in a chemical reaction

2. The extent to which a chemical reaction proceeds

3. The rate at which a reaction proceeds

4. The feasibility of a chemical reaction

Subtopic:  Thermodynamics' Properties and process |
 71%
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

The correct statement among the following is-

1. The presence of reacting species in a covered beaker is an example of an open system.
2. There is an exchange of energy as well as matter between the system and the surroundings in a closed system.
3. The presence of reactants in a closed vessel made up of copper is an example of a closed system.
4. The presence of reactants in a thermos flask or any other closed insulated vessel is an example of a closed system.

.

Subtopic:  Thermodynamics' Properties and process |
 70%
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

If the volume of a gas is reduced to half from its original volume, then the specific heat will-

1. Reduce to half 2. Be Doubled
3. Remain constant 4. Increase four times
Subtopic:  Classification of System, Extensive & Intensive Properties |
 80%
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

During complete combustion of one mole of butane, 2658 kJ of heat is released. The thermochemical reaction for this change is -

1. 2C4H10(g)+13O2(g)8CO2(g)+10H2O(l); 
cH=-2658.0 kJ mol-1

2. C4H10(g)+132O2(g)4CO2(g)+5H2O(l); 
cH=-1329.0 kJ mol-1

3. C4H10(g)+132O2(g)4CO2(g)+5H2O(l); 
cH=-2658.0 kJ mol-1

4. C4H10(g)+132O2(g)4CO2(g)+5H2O(l); 
cH=+2658.0 kJ mol-1

Subtopic:  Enthalpy & Internal energy |
 80%
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

fU of formation of CH4(g) at certain temperature is -393 kJ mol-1. The value of fH is-

1. Zero

2. <fU

3. >fU

4. Equal to fU

Subtopic:  Enthalpy & Internal energy |
 61%
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

In an adiabatic process, no transfer of heat takes place between the system and its surroundings. The correct option for free expansion of an ideal gas under adiabatic condition from the following is -

1. q=0, T0, W=0

2. q0, T=0, W=0

3. q=0, T=0, W=0

4. q=0, T=0, W0

Subtopic:  Thermodynamics' Properties and process |
 69%
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 pressure-volume work for an ideal gas can be calculated by using the expression W=ViVfpexdV.

The work can also be calculated from the pV-plot by using the area under the curve within the specified limits.
An ideal gas is compressed (a) reversibly or (b) irreversibly from volume Vi to Vf.
The correct option is:

1.  W (reversible)=W (irreversible)

2.  W (reversible)<W(irreversible)

3.  W (reversible)>W (irreversible)

4.  W (reversible)=W (irreversible)+pex.V

Subtopic:  First Law of Thermodynamics |
 62%
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

The entropy change can be calculated by using the expression S=qrevT. When water freezes in a glass beaker, the correct statement among the following is:

1. ∆ S  (system) decreases but  ∆ S  (surroundings) remains the same
2. ∆ S  (system) increases but  ∆ S  (surroundings) decreases
3. ∆ S  (system) decreases but  ∆ S  (surroundings) increases
4. ∆ S  (system) decreases but  ∆ S  (surroundings) also decreases

Subtopic:  Spontaneity & Entropy |
 59%
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

On the basis of thermochemical equations (i), (ii), and (iii), find out which of the algebraic relationships given in options (a) to (d) is correct:

(i). C(graphite) + O2(g) → CO2 (g) ; ∆rH = x kJmol-1
(ii). C(graphite) + \(\frac{1}{2}\)O2(g) → CO(g) ; ∆rH = y kJ mol-1
(iii). CO(g) + \(\frac{1}{2}\)O2(g) → CO2(g); ∆rH = z kJ mol-1

1. z=x+y

2. x=y-z

3. x=y+z

4. y=2z-x

Subtopic:  Thermochemistry |
 76%
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

Consider the reactions given below. On the basis of these reactions find out which of the

the algebraic relationships is correct?

(i) C(g) +4H (g) CH4(g); 
Hr =x kJ mol-1
(ii) C(graphite) + 2H2 (g)   CH4; 
Hr  = y kJ mol-1

1. x=y 2. x=2y
3. x>y 4. x<y
Subtopic:  Enthalpy & Internal energy |
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