Which one of the following enthalpy change can have positive sign or negative sign?

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$Δ_{f o r m a t i o n} H$

$Δ_{f r e e z i n g} H$

$Δ_{a t o m i s a t i o n} H$

$Δ_{v a p o u r i s a t i o n} H$

answer is A.

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Detailed Solution

1-Formation of a compound from its elements can be exothermic or endothermic.
2- Freezing is always exothermic
3- Atomisation is always endothermic
4- Vapourisation is always endothermic

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