For a diatomic ideal gas in a closed system, which plot does NOT correctly describe the relation between various…
Thermodynamics · Class 11 · JEE Main Previous Year Question
For a diatomic ideal gas in a closed system, which plot does NOT correctly describe the relation between various thermodynamic quantities?
- a
- b
- c✓
- d
🧠 For a diatomic ideal gas: , , Check each plot against these fixed ratios and standard gas laws.
🗺️ What must be correct for a diatomic ideal gas
- (Mayer's relation — always true) ✓
- ✓
- → isotherms are hyperbolas on – axes ✓
- Internal energy (linear in temperature) ✓
Option (c) shows a plot that violates one of these — typically the wrong slope or intercept for the relationship being graphed.
⚠️ When checking thermodynamic plots, always verify: (1) the slope = the correct coefficient, and (2) the intercept makes physical sense (e.g., at K for an ideal gas).
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