A P-V diagram is obtained by changing the temperature of the gas as shown. During this process the gas is :

heated continuously

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cooled continuously

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heated in the beginning but cooled towards the end

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cooled in the beginning but heated towards the end

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Solution

The correct option is D heated in the beginning but cooled towards the end
From A to B
First initially pressure decrease and volume increases
equation of curve is $P = - k V + c$
Therefore, from ideal gas equation
$T = P V / n R$
$T = (- k V + c) V / n R = (- k V^{2} + c V) / n R$
Therefore its a parabola therefore in this process from A to B volume is increased therefore, its a parabola vertically downwards if we take V on x-axis and T on y-axis
Therefore as volume increases temperature rises becomes maximum and then again starts decreasing
Hence option(C)

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