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5. Thermodynamics and thermochemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
An ideal gas undergoes a reversible isothermal expansion from state $I$ to state $II$ followed by a reversible adiabatic expansion from state $II$ to state $III$. The correct plot($s$) representing the changes from state $I$ to state $III$ is(are)

( $p$ : pressure, $V$ : volume, $T$ : temperature, $H$ : enthalpy, $S$ : entropy)

  • ✓
    $A,B,D$
  • B
    $A,B,C$
  • C
    $A,B$
  • D
    $A,D$
✓

Answer

Correct option: A.
$A,B,D$
a
From state $I$ to $II$ (Reversible isothermal expansion)

$\Rightarrow P$ decreases, $V$ increases, $T$ constant

$H$ constant & $S$ increases.

From state $II$ to $III$ (Reversible adiabatic expansion)

$\Rightarrow P$ decreases, $V$ increases, $T$ decreases

$H$ decreases, $S$ constant

$\therefore$ Plots $(A), (B), (D)$ are correct while $(C)$ is wrong as from $II$ to $III$, $H$ is decreasing.

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