Which of the following allotropic forms of carbon is isomorphous with crystalline silicon?
Each silicon atom in crystalline structure of silicon is tetrahedrally surrounded by four other silicon atoms. This structure is similar to that of diamond.
Thermodynamically the most stable form of carbon is
The compound ‘C’ in the following sequence of reaction is
The number of OH groups directly linked to boron atoms in Na2B4O7.10 H2O is
From B2H6 all the following can be prepared except
A metal, M forms chlorides in +2 and +4 oxidation states. Which of the following statements about these chlorides is correct?
In which of the following silicates, cyclic structure is present?
Al2O3 can be converted to anhydrous AlCl3 by heating
The number of isomers possible for disubstituted borazine, B3N3H3X2 is
Which of the following oxidation states are the most characteristic for lead and tin respectively:
The correct order of C – O bond length among CO, , CO2 is: