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Question

Oxygen is not evolved when:


A

Potassium chlorate is heated with MnO2 catalyst.

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B

Sodium peroxide reacts with water

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C

Ammonium nitrate is heated

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D

Zinc oxide is treated with NaOH

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Solution

The correct options are
C

Ammonium nitrate is heated


D

Zinc oxide is treated with NaOH


Heating KClO3 yields oxygen - as does the reaction between sodium peroxide and water:

2KClO3Δ2KCl+3O2

2Na2O2+2H2O4NaOH+O2

The other options:

ZnO+2NaOH+H2OΔNa2[Zn(OH)4]

NH4NO3ΔN2O+H2O


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