The crystalline form of borax has

1. Tetra nuclear ${\left[{\mathrm{B}}_4{\mathrm{O}}_5{\left(\mathrm{O}\mathrm{H}\right)}_4\right]}^{2-}$ unit
2. All boron atoms in the same plane
3. Equal number of $\mathrm{s}{\mathrm{p}}^2$ and $\mathrm{s}{\mathrm{p}}^3$ hybridized boron atoms
4. One terminal hydroxide per boron atom

Solution

(A) Having ${\left[{\mathrm{B}}_4{\mathrm{O}}_5{\left(\mathrm{O}\mathrm{H}\right)}_4\right]}^{2-}$ tetra nuclear (boron) unit.
(B) All boron atoms not in same plane.
(C) Two boron are $\mathrm{s}{\mathrm{p}}^2$ hybridised and two boron are $\mathrm{s}{\mathrm{p}}^3$ hybridised.
(D) One terminal hydroxide per boron atom is present.

Asked in: JEE Advanced 2016 (Paper 1)

Practice more p Block Elements (Group 13 & 14) questions on Aicharya