General formula of the compound that will be formed, when oxygen reacts with an alkali metal, is :

M O_{2}

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M_{2} O

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M_{2} O_{3}

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M_{3} O_{2}

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M O

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Solution

The correct option is B $M_{2} O$
Oxygen has oxidation state of $- 2 \Rightarrow O^{2 -}$
Alkali metal has oxidation state of $+ 1 \Rightarrow M^{+}$
The compound formed will be $M^{+} O^{2 -}$
On cross linking the oxidation states, the the general formula of metal oxide would be $M_{2} O$

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