First slide

Anomalous properties of Boron

Question

Which of the following statement is incorrect?

Moderate

A

The trichlorides of group-l3 elements, on hydrolysis form ${[M (OH)_{4}]}^{-}$
B

${AlCl}_{3} in acidified aqueous solution forms {[Al {(H_{2} O)}_{6}]}^{3 +}$
C

Boron is unreactive in crystalline form
D

boron forms a very thin hydroxide layer on its surface

Solution

The trichlorides of group-l3 elements on hydrolysis form tetrahedral ${[M (OH)_{4}]}^{-}$ species; the hybridization state of element M is ${sp}^{3}$ . Aluminium chloride in acidified aqueous solution forms octahedral ${[Al {(H_{2} O)}_{6}]}^{3 +}$ ion. In this complex ion, the 3d -orbitals of Al are involved and the hybridization state of Al is ${sp}^{3} d^{2}$ .
Boron is unreactive in crystalline form. Aluminium forms a very thin oxide layer on its surface which protects the metal from further attack by oxygen molecules.

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