Account for the following :
(a) When sugar crystals dissolve in water, the level of water does not rise appreciable.
(b) Dogs generally hang out their tongue in summer.

Explanation

(a) Since water is a liquid, there are intermolecular spaces. Sugar particles occupy these spaces. As a result, water level does not rise appreciable.
(b) For answer, consult Q. 3 (N.C.E.R.T. End Exercise). (c ) For answer, consult Q. 10 (N.C.E.R.T. In text Problems). (d) In summer, dogs get exahusted due to the loss of persipiration from their body. Since they are always running most of the time, they hang out their tongue.