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AIIMS 2003
Exam
AIIMS
Year
2003
Subject
Chemistry
Chapter
Chemical Bonding and Molecular Structure

AIIMS 2003 · Chemistry · Chemical Bonding and Molecular Structure

The paramagnetic species is

The paramagnetic species isThe paramagnetic species is

Options

  1. AKO2\mathrm{KO}_2
  2. BSiO2\mathrm{SiO}_2
  3. CTiO2\mathrm{TiO}_2
  4. DBaO2\mathrm{BaO}_2.

Correct answer

A. KO2\mathrm{KO}_2

Step-by-step solution

KO2\mathrm{KO}_2 is a superoxide of potassium containing superoxide ion, O2−\mathrm{O}^{2-} which has a three electron bond. Thus this ion can be represented as The paramagnetic species is
The presence of one unpaired electron in three electron bond makes this ion paramagnetic.
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