Verified Solution • 2025–26 Session
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QNEET-2024-Ch-124: NEET 2024 Chemistry - Class 11 NEET-2024-Ch-124 Solution: Choose the correct statement for the work done in the expansion …
Choose the correct statement for the work done in the expansion and heat absorbed or released when 5 litres of an ideal gas at 10 atmospheric pressure isothermally expands into vacuum until volume is 15 litres: Both the heat and work done will be greater than zero Heat absorbed will be less than zero and work done will be positive Work done will be zero and heat will also be zero Work done will be greater than zero and heat will remain zero
Multiple Choice Options
- A Both the heat and work done will be greater than zero
- B Heat absorbed will be less than zero and work done will be positive
- C Work done will be zero and heat will also be zero
- D Work done will be greater than zero and heat will remain zero
Step-by-Step Verified Solution
Since it is isothermal, _ T = 0
_ U = nC v _ T = 0
Since expansion is taking place against vacuum
P ext = 0 W = _ P ext _ V = 0
From first law of thermodynamics,
_ U = q + W 0 = q + 0 q = 0