Dr. S.N. DHAWAN, Dr. S.C.KHETERPAL and, P.N.KAPIL Solutions for Chapter: Some p-Block Elements, Exercise 3: Competition Focus

Select the most appropriate statement.

In ${\mathrm{BF}}_3$

The crystalline form of borax has

The number of $\mathrm{B}-\mathrm{O}-\mathrm{B}$ bonds in borax is-

Three moles of ${\mathrm{B}}_2{\mathrm{H}}_6$ are completely reacted with methanol. The number of moles of boron containing product formed is 

 How many crystalline allotropic forms of carbon are known? 

Amongst the following, the maximum number of compounds which do not behave as Lewis acids are: ${\mathrm{SnCl}}_2, {\mathrm{H}}_3{\mathrm{BO}}_3, {\mathrm{AlCl}}_3,{\mathrm{CF}}_4,{\mathrm{SiF}}_4,{\mathrm{CCl}}_4,{\mathrm{BF}}_3 ,{\mathrm{SnCl}}_4$

Total number of elements of group $13$ and $14$ which form basic oxides is

How many silicon atoms are present in the anion of a pyrosilicates?