A reversible heat transfer demands :

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A reversible heat transfer demands :

1. The temperature difference causing heat transfer tends to zero
2. The system receiving heat must be at a constant temperature
3. The system transferring out heat must be at a constant temperature
4. Both interacting systems must be at constant temperatures

Correct Option: A

∆S = 0

⇒	δQ	-	δQ	= 0
	T₁		T₂

⇒ T₁ = T₂