The part of the curve that represents the following chemical equation:
$H_{2} O_{(g)} \to H_{2} O_{(l)}$

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Solution

The correct option is A D
The given chemical reaction $H_{2} O (g) \to H_{2} O (l)$ , represents the phase change, i.e., the physical state of a substance change from one form to another form,
during the phase change no temperature change takes place,
so, the curve D correctly represents the phase change.

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