MCQ
$\,$


- A

- ✓

- C

- D$(A)$ and $(B)$ both





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$Pb \left( NO _{3}\right)_{2} \stackrel{673 K }{\longrightarrow} A + PbO + O _{2}$
$A \stackrel{\text { Dimerise }}{\longrightarrow} B$
