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The oxidation number of C in ${HCO}_{2}^{-}$ is.

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$+ 1$

$+ 2$

$- 1$

answer is D.

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Detailed Solution

$+ 1 + x + 2 (- 2) = - 1$ This gives $x = + 2$

The oxidation number describes how many electrons atoms in a molecule can share, lose, or gain as they form chemical bonds with atoms of other elements. Another word for oxidation state is oxidation number.

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