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23. If ΔQ and ΔW represent the heat supplied to the system and the work done on the system respectively, then the first law of thermodynamics can be written as

(a)      ΔQ= ΔU + ΔW            (b) ΔQ= ΔU – ΔW

(c)      ΔQ=  ΔW-ΔU               (d)   ΔQ= – ΔW-ΔU 

Ans. b

(6)

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