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Question

Which gas is evolved when potassium nitrate is heated?


A

Nitrogen

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B

Nitrogen dioxide

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C

Oxygen

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D

None of the above

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Solution

The correct option is C

Oxygen


When we heat potassium nitrate, it will decompose and form potassium nitrite and oxygen gas.
The involved chemical reaction is :
2KNO32KNO2+O2


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