Question

what is the state of water at:
1. 100 degree celcius
2. 0 degree celcius
3. 4 degree celcius

Answer 1

100----->vapour
0------>solid
4------->water(expanding till 14 degree celcius)

Answer 2

1.At 0°C water can exist as a solid as well as a liquid. There will also be a small amount of water vapour in the air above the water/ice mixture. 
2. At 100°C water exists as a liquid , with a large quantity of water vapour above the surface. For this one - look inside a kettle of boiling water - If you measure the temperature of the water it will be 100°C - you will see a large amount of condensed steam also at 100°C above the water surface
3. liquid