Q67 / 200 · NEET 2023 (Manipur) · Chemistry

Select the element $(M)$ whose trihalides cannot be hydrolysed to produce an ion of the form $\left[\mathrm{M}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$

  • A
    $\mathrm{Al}$
  • Correct answer
    B
    B
  • C
    Ga
  • D
    In

Solution

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 .

Hence, the correct answer is option: 'B'.

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