The luster of a metal is due to
A). its high density
B). its high polishing
C). its chemical inertness
D). presence of free electrons
presence of free electrons
Metallic lustre is due to the mobile electrons present in metals which when de-excites releases energy in the form of light.
2. The molecular mass of a gas is
4. The smog is essentially caused by the presence of
5. The chemical formula of Ammonia is _____ .
6. Percentage of lead in lead pencils is
7. When lime juice is dropped on baking soda brisk effervescence takes place because the gas evolved is
9. If all bullets could not be removed from gun shot injury of a man, it may cause poisoning by