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Select the element $(M)$ whose trihalides cannot be hydrolysed to produce an ion of the form $\left[\mathrm{M}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$
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B
Boron trihalides cannot be hydrolysed to produce an ion of the form $\left[\mathrm{B}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ because of absence of $d$ orbitals in boron. The maximum covalence of Boron is 4 .
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