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In first law of thermodynamics, which one of the following is conserved ?

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In first law of thermodynamics, which one of the following is conserved ?

(A) Number of molecules

(B) Temperature

(C) Energy

(D) Number of moles

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Correct option is (C) Energy

According to first law of thermodynamics,

Q = ΔU + W

where Q is the heat flowing, ΔU is the change in internal energy and W is work done.

It is concerned with the conservation law of energy.

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