The correct value  of the gas  constant  'R'   is close to

Van der  waals'  real gas, act as an ideal  gas, at which condition?

A  pure  crystalline substance  on being  heated  gradually  first forms a  turbid  liquid at constant  temperature and still at  higher  temperature turbidity completely disappears. The  behaviour is a characteristic of substance forming

A  closed flask  contains water in all  its  three states  solid,  liquid and  vapour  at 0^oC.  In this situation,  the avearage  kinetic  energy of water molecules will be

Most  crystals  show  good cleavage  because  their atoms, ions or  molecules  are

With which one of the following  elements  silicon should be doped so as to give p- type  of semiconductor?

CsBr  crystallises  in a body  centred  cubic  lattice.  The unit cell length  is  436.6pm. Given that the atomic  mass of Cs= 133 μ and that of Br= 80μ and Avagadro  number  being 6.02x10²³ mol^-1,  the density of CsBr  is

The edge  length  of a centred unit cubic  cell is 508 pm.  If the radius of the cation is 100pm,  the radius of  the anion is

At  which one  of the following  temperature  pressure conditions, the deviation of a gas  from ideal behavior  is  expected  to be  minimum?

The  beans are  cooked earlier  in pressure  cooker,  because