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Byju's Answer

Standard IX

Chemistry

Preparation of Oxygen

Which gas is ...

Question

Which gas is evolved when potassium nitrate is heated?

Nitrogen

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Nitrogen dioxide

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Oxygen

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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 :
$2 K N O_{3} \to 2 K N O_{2} + O_{2}$

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Similar questions

Gases evolved during the thermal decomposition of mercuric nitrate $H g (N O_{3})_{2}$ are:

Q. Given below are word equations. Convert them into chemical equations using symbols and valencies. Balance the equations. Use appropriate signs for gases and precipitates in the reaction.
i) Zinc Sulphide

+

Oxygen gas

\to

Zinc oxide solid

+

Sulphur dioxide gas
ii) Silver nitrate solution

+

Sodium chloride solution

\to

Silver chloride precipitate

+

Sodium nitrate solution
iii) Sulphur solid

+

Concentrated nitric acid

\to

Sulphuric acid

+

Nitrogen dioxide gas

+

Water
iv) Barium chloride Solution

+

Potassium sulphate Solution

\to

Barium sulphate Precipitate

+

Potassium chloride solution
v) Silver nitrate on heating

\to

silver metal

+

nitrogen dioxide gas

+

Oxygen gas.
vi) Aluminium hydroxide

+

Nitric acid

\to

Aluminium nitrate

+

Water.

Q. Name the gas evolved when potassium nitrate crystals are heated with sulphuric acid.

Q. Lead nitrate crystals on strong heating decompose to form lead monoxide, nitrogen dioxide gas and oxygen gas.

Q. When lead nitrate is heated, it breaks down into lead monoxide, nitrogen dioxide and oxygen as given below:

2 P b (N O_{3})_{2} \to 2 P b O + 4 N O_{2} + O_{2}

The above reaction is an example of :

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Which gas is evolved when potassium nitrate is heated?

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 : 2KNO3→2KNO2+O2

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 :
$2 K N O_{3} \to 2 K N O_{2} + O_{2}$