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MHT CET 202626 AprilMorning Shift

Exam: MHT CET
Year: 2026
Date: 26 April
Shift: Morning Shift
Subject: Chemistry
Chapter: s Block Elements

MHT CET 2026 · 26 April · Morning Shift · Chemistry · s Block Elements

Identify the oxide used as CO_2 adsorbent and oxygen generator from...

Identify the oxide used as

\text{CO}_2

adsorbent and oxygen generator from following.

Options

A $\text{Na}_2\text{O}$
B $\text{Na}_2\text{O}_2$
C $\text{K}_2\text{O}$
D $\text{KO}_2$

Correct answer

D. $\text{KO}_2$

Step-by-step solution

Potassium superoxide (

\text{KO}_2

) is widely used as a

\text{CO}_2

adsorbent and oxygen generator in space capsules, submarines, and breathing masks.

The reaction involved is:

4\text{KO}_2 + 2\text{CO}_2 \rightarrow 2\text{K}_2\text{CO}_3 + 3\text{O}_2

Through this reaction, it absorbs carbon dioxide and releases oxygen gas.

Answer:

\text{KO}_2

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