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For three low density gases A, B, C, pressure versus temperature graphs are plotted while keeping them at constant volume, as shown in the figure. The temperature corresponding to the point K is

Asked in JEE Main 1st Feb 2nd Shift 2023 · Gas laws and P-V-T processes

• (1) -373°C
• (2) -40°C
• (3) -100°C
• (4) -273°C

Step-by-step solution

Why the other options are wrong

• (1) -373°C comes from subtracting 373 instead of 273, i.e. using the boiling point of water in place of the ice point.
• (2) -40° is where the Celsius and Fahrenheit scales agree; it has nothing to do with the pressure vanishing.
• (3) -100°C is read off the axis rather than found by extrapolating the lines to P=0.

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