A solution is prepared by dissolving 0.6 g of urea (molar mass = 60 g mol^–1) and 1.8 g of glucose (molar mass = 180 g mol^–1) in 100 mL of water at 27^oC. The osmotic pressure of the solution is :
(R = 0.08206 L atm K^–1 mol^–1)

Consider the following reactions :

'A' is :

The ratio of number of atoms present in a simple cubic, body centered cubic and face centered cubic structure are, respectively :

In comparison to boron, berylium has :