Mention the constituent particles and kinds of forces holding the particles in the following crystalline solids. (1) Solid methane (2) Solid ammonia.

Explanation

(1) In solid `CH_(4)`, the constituent particle is `CH_(4)` molecule. Molecules in solid `CH_(4)` are held by London forces.
(2) In solid `NH_(3)`, the constituent particle is `NH_(3)` molecule. Molecules in solid `NH_(3)` are held by dipole-dipole attractive forces.