7.
find the correct one
Answer : C. convertion from the Solid state to gaseous state- sublimation
8.
Dry ice is
Answer : A. solid carbon
9.
When electrons are trapped in the crystal lattice in place of anion vacancy, the defect in the crystal is known as
Answer : B. F-centre
10.
Which one of the following properties of a liquid does not affect its rate of evaporation?
Answer : A. Volume
11.
A corked bottle full of water when frozen will break because
Answer : C. the volume of water increases on freezing
12.
Mercury boils at
Answer : B. 357o C