What is the physical state of water at –

(a) 25°C (b) 0°C (c) 100°C?

(a) At 25°C, the water will be in its liquid form.

(b) At 0°C, the water will be reaching its freezing point so both solid and liquid phases are observed as they tend to co-exist simultaneously and slowly with more lowering of temperature, the water converts into ice.

(c) At 100°C, the water will be reaching its boiling point so both liquid and gaseous state of water are observed as they tend to co-exist simultaneously and slowly with more increase of temperature, the water converts into vapours .