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Reversible expansion of an ideal gas under isothermal and adiabatic conditions are shown in the figure:

AB $\to$ Isothermal expansion

AC $\to$ Adiabatic expansion

Which of the following options is not correct?

1.	$\Delta S_{\text {isothermal }}>\Delta S_{\text {adiabatic }} $	2.	$T_A=T_B $
3.	$W_{\text {isothermal }}>W_{\text {adiabatic }} $	4.	$T_C>T_A$

Subtopic: 2nd & 3rd Law of Thermodynamics |

55%

Level 3: 35%-60%

NEET - 2019

1(12%)

2(17%)

3(17%)

4(56%)

Hints

Identify the correct statement regarding entropy:

1.	At absolute zero of temperature, the entropy of all crystalline substances is taken to be zero.
2.	At absolute zero of temperature, the entropy of a perfectly crystalline substance is positive.
3.	At absolute zero of temperature, the entropy of a perfectly crystalline substance is taken to be zero.
4.	At 0 °C , the entropy of a perfectly crystalline substance is taken to be zero.

Subtopic: 2nd & 3rd Law of Thermodynamics |

70%

Level 2: 60%+

AIPMT - 1998

1(18%)

2(7%)

3(70%)

4(6%)

Hints

1.	\(\Delta S_{\text {isothermal }}>\Delta S_{\text {adiabatic }} \)	2.	\(T_A=T_B \)
3.	\(W_{\text {isothermal }}>W_{\text {adiabatic }} \)	4.	\(T_C>T_A\)