Which of the following reaction is/are correct?

K C l O_{3} Δ - \to K C l + 3 O_{2}

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2 P b_{3} O_{4} Δ - \to 6 P b O + O_{2}

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2 H_{2} O_{2} \to 2 H_{2} O + O_{2}

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2 A g_{2} O Δ - \to 3 A g + O_{2}

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Solution

The correct options are
B $2 P b_{3} O_{4} Δ - \to 6 P b O + O_{2}$
C $2 H_{2} O_{2} \to 2 H_{2} O + O_{2}$
In the given reactions following reactions are not balanced:
$K C l O_{3} Δ - \to K C l + 3 O_{2}$
$2 A g_{2} O Δ - \to 3 A g + O_{2}$

Balanced reactions are:
$2 K C l O_{3} Δ - \to 2 K C l + 3 O_{2}$
$2 A g_{2} O Δ - \to 4 A g + O_{2}$
$2 P b_{3} O_{4} Δ - \to 6 P b O + O_{2}$
$2 H_{2} O_{2} \to 2 H_{2} O + O_{2}$

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