Question

Q1. Name the following:
1. Elements that emit harmful radiations are called
2. Spontaneous mixing of particles of two or more substances
3. separation of a liquid in a liquid mixture is done by
4. The hardest non metal naturally occurring on the earth
5. the process by which a solid directly changes into the gaseous stat​

Answer 1

1) Elements that emit ionizing radiation are called radionuclides.

2) Diffusion is a consequence of the constant thermal motion of atoms, molecules and particles and result in moving from areas of high concentration to areas of low concentration.

3) Distillation

4) Diamond (Carbon) is a non-metal which is the hardest naturally occurring substance.

5) Sublimation is the process of transformation directly from the solid phase to the gaseous phase, without passing through an intermediate liquid phase.