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Select the element (M) whose trihalides cannot be hydrolysed to produce an ion of the form $[M(H_2O)_6]^{3+}$
A
Ga
B
In
C
Al
D
B
Detailed Solution
Boron has a maximum covalency of four (due to the absence of d-orbitals in its valence shell), so it cannot expand its coordination number to six to form $[B(H_2O)_6]^{3+}$, unlike Al, Ga, and In, which can form such hexaaqua ions.