In $M g O$ , the valency of magnesium is :

+ 1

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+ 2

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- 2

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- 1

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Solution

The correct option is B $+ 2$
$M g O$ exists as ${M g}^{+ 2}$ and $O^{2 -}$ , therefore the valency is 2.

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{MgCl}_{2}

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