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Question

A graph for an ideal gas at constant volume is plotted by taking pressure along y - axis and centigrade temperature along x - axis as shown in the figure below. Find the x intercept of the graph.


A
273.15 C
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B
273.15 K
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C
273 C
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D
273 K
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Solution

The correct option is A 273.15 C
For an ideal gas at constant volume, pressure of a gas is proportional to the temperature i.e PT
The pressure of a gas in (Nm2) becomes zero when the temperature (in Kelvin scale) becomes zero.
From the relation between Kelvin and Celsius scale,
C=K273.15
We can conclude that, the x-intercept of the graph (when pressure is equal to zero) is 273.15 C


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