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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
Which one of the following equations does not correctly represent the first law of thermodynamics for the given processes involving an ideal gas? (Assume non -expansion work is zero)
  • A
    Isochoric process: $\Delta U =  q$
  • ✓
    Adiabatic process: $\Delta U =  - w$
  • C
    Cyclic process: $q = -w$
  • D
    Isothermal process:  $q = -w$
✓

Answer

Correct option: B.
Adiabatic process: $\Delta U =  - w$
b
According to the first law of thermodynamics $q=\Delta U-w$

For cyclic process : $\Delta U = 0 \Rightarrow q =  - w$

For isothermal process : $\Delta U = 0 \Rightarrow q =  - w$

For adiabatic process : $q = 0 \Rightarrow \Delta U = W$

For isochoric process : $w = 0 \Rightarrow \Delta U = q$

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