Water has maximum density at temperature:

Correct option is B

Correct option: (b) 277 K
Explanation (why b is correct):
· Water shows anomalous expansion.
· Its density increases from 0 °C up to 4 °C, then decreases.
· 4 °C = 277 K, at which water attains its maximum density.
❌ Why other options are incorrect
· (a) 273 K (0 °C)
· Density is slightly lower than at 4 °C.
· (c) 289 K (16 °C)
· Density decreases above 4 °C.
· (d) 298 K (25 °C)
· Much lower density compared to maximum.
�� Key Points
· Maximum density of water = 4 °C = 277 K
· Responsible for:
· Ice floating on water
· Survival of aquatic life in winter
· A classic example of anomalous behavior of water.