Oxygen is not evolved when:

Potassium chlorate is heated with $M n O_{2}$ catalyst.

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Sodium peroxide reacts with water

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Ammonium nitrate is heated

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Zinc oxide is treated with $N a O H$

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Solution

The correct options are
C
Ammonium nitrate is heated

D
Zinc oxide is treated with $N a O H$

Heating $K C l O_{3}$ yields oxygen - as does the reaction between sodium peroxide and water:

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

$2 N a_{2} O_{2} + 2 H_{2} O ⟶ 4 N a O H + O_{2} ↑$

The other options:

$Z n O + 2 N a O H + H_{2} O Δ - \to N a_{2} [Z n (O H)_{4}]$

$N H_{4} N O_{3} Δ - \to N_{2} O + H_{2} O$

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