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Thermodynamics — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThermodynamics1 Mark
MCQ
In an adiabatic process, no transfer of heat takes place between system and surroundings. Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following.
  • A
    $\text{q}=0,\ \Delta\text{T}\neq0,\ \text{w}=0$
  • B
    $\text{q}\neq0,\ \Delta\text{T} < 0,\ \text{w}=0$
  • ✓
    $\text{q}=0,\ \Delta\text{T}=0,\ \text{w}=0$
  • D
    $\text{q}=0,\ \Delta\text{T} < 0,\ \text{w}\neq0$
✓

Answer

Correct option: C.
$\text{q}=0,\ \Delta\text{T}=0,\ \text{w}=0$
For, free expansion $,w = 0$ for, adiabatic process $,q = 0$ from first law of thermodynamics : $\Delta\text{U}=\text{q}+\text{w}=0+0=0$ since, there is no change of internal energy hence temperature will also remain constant, i.e., $\Delta\text{T}=0$

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