EAN of cobalt is 36 in knowing that atomic number of Co is 27, is present as

Peroxide ion

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Dioxide ion

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Superoxide ion

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Oxide ion

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Solution

The correct option is A Peroxide ion
Peroxide $= L_{2}^{2 -}$ , Dioxide $= 2 O^{2 -}$
Superoxide $= O_{2}^{-}$ , Oxide $= O^{2 -}$
Ean $= Z - 0. N + 2 \times C . N$
$∴$ If $O_{2}$ is present as $= O_{2}^{2 -}$ , then O.N. of Co is +3
$∴$ EAN $= 27 - 3 + 2 \times 6 = 36$

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