One of the following represents the solution of solid in a solid. This one is :
(a) boron (b) brass (c) beryllium (d) bread
One of the following is a solid foam. This one is:
(a) butter (b) bread (c) shaving cream (d) ruby
(a) In Mendeleev’s periodic table, a gap was not left for one of the following elements. This element is :
(a) gallium (b) beryllium (c) germanium (d) scandium