At what temperature can water be in both liquid and gaseous state?
\(100^\circ C\)
At the boiling point of water (100 °C at 1 atm pressure), water and steam coexist in liquid-gas equilibrium. Heat added at this temperature converts liquid to vapour without any temperature change (latent heat of vaporisation). 0 °C is the freezing point where solid and liquid coexist. Hence water is in liquid+gas states at 100 °C, matching option 2.
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