Why does a diamond sparkle with great brilliance?
Or, Why does a diamond cut in the same fashion shine more brightly than a piece of glass?

Why does the crack of a glass window shine?

Why does a metal ball coated with lamp - black appear shining when it is immersed in water?

Does a solid metallic sphere retain more charge than a hollow sphere of the same diameter?

Why does roasting of cinnabar HgS, produce the metal, mercury, rather than an oxide of mercury?

Make a dilute solution of the acid that is used i your home to clean bathrooms, very carefully, avoiding contact of the acid with your skin or eyes. Divide this solution into two parts and place it in two small glasses. In one glass add pieces of marle and in the other add marble dust.Does the same phenomenon happen in both cases? If not, which takes more time?

Why does nitrogen show catenation properties less than phosphorus?

Why does a piece of burning Mg ribbon continues to burn in SO_2 ? Give the name of product.