Question

GIVE REASONS FOR THE FOLLOWING: [SiF6] 2- is known but [SiCl6] 2- is not known. Diamond is covalent yet it has high melting point Boric acid is considered as a weak acid Boron is unable to form BF6 3- ion BF3 behaves like a Lewis acid

Answer 1

this is because of Pπ-Pπ bonding