Preparation a...

Preparation and Properties of Potassium Peroxide and Superoxide

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$K O_{2}$ finds use in breathing equipment to safeguard the user to breathe in oxygen generated internally in the apparatus without being exposed to toxic fumes outside. The supply of oxygen is due to :

i.Slow decomposition of $K O_{2}$

ii.reaction of superoxide with moisture in the exhaled air

iii.reaction of $K O_{2}$ with $C O_{2}$ in the exhaled air

only iii is correct
ii and iii are correct
both i and iii are correct
i ii and iii are all correct

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K O_{2}

is used in oxygen cylinders in space and submarines because

It eliminates moisture
It eliminates $N_{2}$
It absorbs $C O_{2}$ and increases $O_{2}$ content
produces ozone

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Q. The correct order of stabilities of the following superoxides is

$K O_{2} > R b O_{2} > C s O_{2}$
$R b O_{2} > C s O_{2} > K O_{2}$
$C s O_{2} > R b O_{2} > K O_{2}$
$K O_{2} > C s O_{2} > R b O_{2}$

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Q. Potassium when heated strongly in oxygen, it forms

$K_{2} O$
$K O_{2}$
$K_{2} O_{2}$
$K O_{3}$

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