Select the element (M) whose trihalides cannot be hydrolysed to produce an ion of the form [2023]

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Solution

Q.
Select the element (M) whose trihalides cannot be hydrolysed to produce an ion of the form ${[M {(H_{2} O)}_{6}]}^{3 +} .$ [2023]

1 $Ga$

2 $In$

3 $Al$

4 $B$

Ans.
(4)

Maximum covalency of boron is four due to the absence of $d$ -orbitals. Hence, its trihalide cannot be hydrolysed to produce an ion of the form ${[M {(H_{2} O)}_{6}]}^{3 +}$ .

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