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How are the following indicated in chemi...

How are the following indicated in chemical equation ?
(i) Evolution of a gas (ii) Formation of a precipitate
(iii) Absorption of heat (iv) Evolution of heat .

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Introduction|Exercise|Characteristics Of Chemical Reaction|Evolution Of A Gas|Formation Of Precipitate |Summary

When an ideal gas expands in vaccum, there is neither absorption nor evolution of heat. Why?