Given below are two statements : Statement I: Group 13 trivalent halides get easily hydrolysed by water due to their covalent nature. Statement II: AlCl 3 upon hydrolysis in acidified aqueous solution

Question

Given below are two statements :

Statement I: Group $13$ trivalent halides get easily hydrolysed by water due to their covalent nature.

Statement II: ${AlCl}_{3}$ upon hydrolysis in acidified aqueous solution forms octahedral ${[Al {(H_{2} O)}_{6}]}^{3 +}$ ion.

In the light of the above statements, choose the correct answer from the options given below :

TestHub · Accepted Answer

In trivalent state most of the 13th group compounds being covalent are hydrolysed in water. Trichlorides of group 13 on hydrolysis in water form tetrahedral ${[M {(OH)}_{4}]}^{-}$ species, the hybridisation state of element $M$ is ${sp}^{3}$ .

In case of aluminium, acidified aqueous solution forms octahedral ${[Al {(H_{2} O)}_{6}]}^{3 +}$ ion, which has an aluminium as a central metal atom and water molecules as ligands. The aluminium is in $+ 3$ oxidation state and forms $6 {sp}^{3} d^{2}$ hybrid orbitals.

Hence option D is the answer.

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