In the reaction $M g + O_{2} ⟶ 2 M g O$ the atomicity of $M g O$ is:

one

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two

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four

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none of these

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Solution

The correct option is B two
Atomicity is the number of atoms present in the compound or molecules.
In $M g O$ , there is one $M g$ atom and one $O$ atom. Thus its atomicity is 2.

Hence, the correct option is B

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