Q5 of 27 Page 12

What is the physical state of water at:

(a) 250C (b) 00C (c) 1000C

(a) Between 00C and 1000C water exists as a liquid. The physical state of water at 25°C is liquid.

(b) 0°C is the melting point of ice as well as the freezing point of water. Hence, the physical state of water can be both liquid and solid at 0°C.


(c) 1000C is the boiling point of water as well as the condensation temperature of steam. Hence, the physical state of water can be both liquid or gas at 1000C.


More from this chapter

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3

Give reasons for the following observations:

(a) Naphthalene balls disappear with time without leaving any solid.


(b) We can get the smell of perfume sitting several metres away.

 4

Arrange the following substances in increasing order of forces of attraction between the particles -water, sugar, oxygen.

 6

Give two reasons to justify:

(a) Water at room temperature is a liquid.


(b) An iron almirah is a solid at room temperature.

 7

Why is ice at 273 K more effective in cooling than water at the same temperature?