Q25 / 75 · JEE Main 2020 (09 Jan Shift 2) · Chemistry

The sum of the total number of bonds between chromium and oxygen atoms in chromate and dichromate ions is ______________.

Correct answer: 12

Solution

Chromate ion

Dichromate ion

The chromate ion (CrO42–) has a tetrahedral shape, whereas dichromate ion has two tetrahedral units with one common oxygen having Cr-O-Cr bond angle of 126°. Both are oxyanions of chromium in the 6+ oxidation state and are moderately strong oxidizing agents.

Hence, the correct answer is 12.

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