Which are the compounds used for imparting the following colours to glass?

• Green • Yellow • Blue

Which constituents form the basis of the variety of colours in the world of colours? What are their characteristics?

How are glasses manufactured? What are the raw materials needed for hard glass and borosilicate glass?

Butane obtained by the thermal decomposition of higher hydrocarbons can be liquefied to get LPG. Identify examples for such possible situations.

Clay is an important constituent in the manufacture of cement. Find other substances for the manufacture of which clay is used.