Carbon monoxide is carried around a closed cycle abc, in which bc is an isothermal process, as shown in the figure. The gas absorbs 7000 J of heat, as its temperature is increased from 300K to 1000K in going from a to b. The quantity of heat rejected by the gas during the process ca is

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4200 J

5000 J

9000 J

9800 J

answer is D.

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Detailed Solution

From a to b heat absorbed = ncvdtn5R21000-300=7000n5R2×700=7000nR = 4In the process c to a at constant pressure temperature decreases from 1000 to 300 K.Heat rejected ncpdtn7R2700nR2×7×70042×4900=9800J

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