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Reaction with Alkali Metal

Which gas is ...

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

Oxygen gas is evolved when Potassium Nitrate is heated leaving behind potassium nitrite.

$K N O_{3} Δ - \to K N O_{2} + O_{2} ↑$

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Which gas is evolved when potassium nitrate is heated?

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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.
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\to

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Sulphur dioxide gas
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Sodium chloride solution

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vi) Aluminium hydroxide

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

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