Question

At what temperature does water has maximum density? Give Reason.

(a) 0°C
(b) 100°C
(c) 4°C
(d) 273K
​

Answer 1

4° C

bcoz above the freezing temp the density begins to increase first as ice has a crystal lattice st. having a lot of empty space.
But as the temp. rises further and all the ice melts then the density beings to decrease with increase in temp.