First slide

Orthoboric acid

Question

Boric acid (H₃BO₃) has

Easy

A

Trigonal structure
B

Tetrahedral structure
C

Layer structure, in which BO₃ units are linked by O₂
D

Layer structure, in which planar BO₃ units are linked by Hydrogen Bonding

Solution

In boric acid planar BO₃^-3 units are joined by hydrogen bonds to give a layer like structure.The adjacent layers in the crystal of boric acid are held together by weak Vander waal's forces of attractions.Because of weak forces of attraction,one layer can slide over the other.This slippery nature makes boric acid become soft and soapy to touch.

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