When rubidium is reacted with oxygen, the compound formed is

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$R b_{2} O_{2}$

$R b_{2} O$

$RbO$

$R b O_{2}$

answer is D.

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Detailed Solution

However, the combination between oxygen and the moisture in the air causes this surface to tarnish quickly. When rubidium is burnt in air, $R b O_{2}$ , a dark brown rubidium superoxide, is mostly formed.

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