Answer:
A. [tex]0^o C[/tex]
Explanation:
As we know that water has boiling temperature at 100 degree Celsius and melting temperature at 0 degree Celsius.
now at these two temperature water will require more heat to change its phase from one state to other state.
Like if water is at 0 degree C in solid state(ice) then we need extra heat to in form of latent heat of fusion to convert the phase of ice to water and then its temperature start rising.
Similarly if water is at 100 degree C then if we provide heat to it inform of latent heat of vaporization then its phase will convert from water to vapor and then after this its temperature will start rising.
so here correct answer must be ZERO degree Celsius
