For making good quality mirrors, plates of flint glass are used. These are obtained by floating molten glass over a liquid metal which does not solidify before glass. The metal used can be 

In curing cement plasters water is sprinkled from time to time.This helps in 

Which is not a mineral of aluminium?

Which of the following is a component of ruby?

A hydride of nitrogen which is acidic is 

Graphite is a soft, solid lubricant,extremely difficult to melt. The reason for this anamolous behaviour is that, graphite

Carborundum is obtained when silica is heated at high temperature with 

Of the following compounds, the most acidic is

PH₃, the hydride of phosphorus is

The mixture of conc.HCl and HNO₃ made 3:1 ratio contains