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Standard XII

Chemistry

Preparation and Properties of Potassium Peroxide and Superoxide

KO2 finds use...

Question

$K O_{2}$ 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

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ii and iii are correct

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both i and iii are correct

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i ii and iii are all correct

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Solution

The correct option is B ii and iii are correct
Let us look at the properties of $K O_{2}$ :

$2 K O_{2} + 2 H_{2} O \to 2 K O H + H_{2} O_{2} + O_{2}$

$2 K O_{2} + C O \to K_{2} C O_{3} + O_{2}$

$4 K O_{2} + 2 C O_{2} \to 2 K_{2} C O_{3} + 3 O_{2}$

Clearly the answer is b) both ii and iii are correct

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Similar questions

$K O_{2}$ 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

Q. Which of the following reactions of potassium super oxide supply oxygen gas in the breathing equipments used in space and submarines ?
(1) Reaction of superoxide with nitrogen in the exhaled air.
(2) Reaction of superoxide with moisture in the exhaled air.
(3) Reaction of superoxide with carbon dioxide in the exhaled air

Q. A self-contained breathing' apparatus uses potassium superoxide,

K O_{2}

, to convert the carbon dioxide and water in exhaled air into oxygen, as shown by the equation:

4 K O_{2} (s) + 2 H_{2} O (g) 4 C O_{2} (g) \to 4 K H C O_{3} (s) + 3 O_{2} (g)

How many molecules of oxygen gas will be produced hem 0.0468 g of carbon dioxide that is exhaled in a typical breath?

Potassium superoxide,

K O_{2}

, is utilised in closed system breathing apparatus. Exhaled air contains

C O_{2}

and

H_{2} O

both of which are removed and the removal of water generates oxygen for breathing by the reaction:

4 K O_{2} (s) + 2 H_{2} O (l) \to 3 O_{2} (g) + 4 K O H (s)

. The potassium hydroxide removes

C O_{2}

from the appratus by the reaction:

K O H_{s w} + C O_{2} (g) \to K H C O_{3} (s)

The mass of

K O_{2}

generating

48

g of oxygen is :

Q. Some older emergency oxygen masks containing potassium superoxide

(K O_{2}))

react with

C O_{2}

and water in exhaled air to produce oxygen according to the given equation.

4 K O_{2} + 2 H_{2} O + 4 C O_{2} \to 4 K H C O_{3} + 3 O_{2}

If a person exhales

0.667 g

C O_{2}

per minute, how many grams of

K O_{2}

are consumed in 5.0 minutes?

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The correct option is B ii and iii are correct Let us look at the properties of KO2: 2KO2+2H2O→2KOH+H2O2+O2 2KO2+CO→ K2CO3+O2 4KO2+2CO2→ 2K2CO3+3O2 Clearly the answer is b) both ii and iii are correct