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The first law of thermodynamics in isothermal condition is represented as

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The first law of thermodynamics in isothermal condition is represented as

(A) dQ = dW

(B) dQ = dU + dW

(C) dQ = dU

(D) dU = dW = 0

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1 Answer

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Correct opiton is (A) dQ = dW

In an isothermal process,

ΔT = 0

ΔU = n Cv ΔT = 0

According to the first law of Thermodynamics:

ΔQ = ΔW + ΔU

ΔQ = ΔW + 0 

Hence ΔQ = ΔW

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