MCQ
What are $N$ and $M$ ?


- A$6,6$
- ✓$6,4$
- C$4,4$
- D$3,3$


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