p-Block Elements-I - Result Question 13

####13. The crystalline form of borax has

(2016 Adv.)

(a) tetranuclear [B4O5(OH)4]2 unit

(b) all boron atoms in the same plane

(c) equal number of sp2 and sp3 hybridised boron atoms

(d) one terminal hydroxide per boron atom

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Answer:

Correct Answer: 13. (b)

Solution:

  1. Na2B4O710H2O (borax) is actually made of two tetrahedral and two triangular units, and is actually written as Na2[B4O5(OH)4]5H2O.

(a) Thus, correct.

(b) Boron atoms are in different planes thus, incorrect.

(c) Two sp2 and two sp3-hybridised B atoms thus, correct.

(d) Each boron has one - OH group thus, correct.



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