Question

why is ice at 273 k not effective in cooling than water at the same temperature

Answer 1

Because at 0° C (273 K) particles of water have more energy comparing it to water at the same temperature.

Answer 2

$\huge\sf{\purple{\underline{\underline {♡Answer}}}}$

Ice at 273K is more effective in cooling than water at the same temperature as cie takes latent heat from the substances for melting and hence cools the substances more effectively than water at the same temperature.