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23. When an ideal gas in a cylinder was compressed isothermally by a piston, the work done on the gas was found to be

1.5×104 J . During this process about

(a) 3.6×103  cal  of heat flowed out from the gas

(b) 3.6×103   cal of heat flowed into the gas

(c)  1.5×104  cal of heat flowed into the gas

(d) 1.5×104  cal of heat flowed out from the gas

Answer-a

(12)

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