Q.

Which of the following absorbs carbon dioxide and  releases oxygen?

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a

CaO

b

KO2

c

KOH

d

K2O

answer is B.

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Detailed Solution

KO2  (Potassium Superoxide) absorbs CO2  and liberates O2 .      ∴KO2    is used to purify air4KO2 +  2CO2   →    2K2CO3  +   3O2
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