(1) White fumes appear around the bottle of Anhydrous aluminium chloride. Give reason.
(ii) Boron is unable to form BF3-ion. Explain.
(iii) Why is boric acid considered as a weak acid?
(iv) Explain the structure of Diborane
Answers
- (4) answer::
The structure of Diborane molecule consists of four hydrogen atoms and that of two boron atoms coming on the same plane. ... The boron atom is known to be sp3 hybridized and has four hybrid orbitals. From these four hybrid orbitals, three of the orbitals have one electron each, and of which one is an empty orbital.
2.(3) answer::Boric acid is a weak monobasic acid because it does not dissociate completely to give H+ ions but it can form metaborate by accepting OH-ions from water.
3.(2) answer::Boron is a non-metallic element. It is electron-deficient. It does not possess d orbitals in its valence shell. ... Therefore, boron is unstable to form BF6 3- ion
4.(1) answer::White fumes are due to the presence of HCl gas. Anhydrous aluminium chloride is hydrolysed partly with the moisture in the atmosphere to give HCl gas. This HCl combines with the moisture in the air and appears white in colour.