JEE Main · 2020 · 05 Sep 2020 · Shift 2 · Hydrogen

Hydrogen peroxide, in the pure state, is:

(A)non-planar and blue in color✓ Correct
(B)planar and blue in color
(C)linear and blue in color
(D)linear and almost colorless

Answer: (A)

Solution

A molecule of hydrogen peroxide is not flat: its two

O - H

bonds lie in different planes, giving the familiar open-book shape with a dihedral twist, a geometry forced by repulsion among the lone pairs and bond pairs on the two oxygens. In its pure liquid state

H X_{2} O X_{2}

is a pale blue liquid. Pure hydrogen peroxide is therefore non-planar and blue in colour.

JEE Main · 2020 · 05 Sep 2020 · Shift 2 · Single correct option

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