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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.
i) Zinc Sulphide

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\to

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Sulphur dioxide gas
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Sodium chloride solution

\to

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Potassium sulphate Solution

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vi) Aluminium hydroxide

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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.

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