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JEE Advanced 2016Paper 1

Exam: JEE Advanced
Year: 2016
Paper: Paper 1
Subject: Chemistry
Chapter: p Block Elements (Group 13 & 14)

JEE Advanced 2016 · Paper 1 · Chemistry · p Block Elements (Group 13 & 14)

The crystalline form of borax has

The crystalline form of borax has

The crystalline form of borax has

Options

ATetra nuclear ${\left[{B}_{4}{O}_{5}{\left(OH\right)}_{4}\right]}^{2 -}$ unit
BAll boron atoms in the same plane
CEqual number of $s{p}^{2}$ and $s{p}^{3}$ hybridized boron atoms
DOne terminal hydroxide per boron atom

Correct answer

A. Tetra nuclear ${\left[{B}_{4}{O}_{5}{\left(OH\right)}_{4}\right]}^{2 -}$ unit

Step-by-step solution

The crystalline form of borax has

(A) Having

{\left[{B}_{4}{O}_{5}{\left(OH\right)}_{4}\right]}^{2 -}

tetra nuclear (boron) unit.
(B) All boron atoms not in same plane.
(C) Two boron are

s{p}^{2}

hybridised and two boron are

s{p}^{3}

hybridised.
(D) One terminal hydroxide per boron atom is present.

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