PYQ NEET- Redox Reactions L-2

Question: Which of the following reactions is a decomposition redox reaction?#

A) $\mathrm{P}_4(\mathrm{~s})+3 \mathrm{OH}^{-}$(aq) $+3 \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{PH}_3(\mathrm{~g})+3 \mathrm{H}_2 \mathrm{PO}_2^{-}$(aq)

B) $2 \mathrm{~Pb}\left(\mathrm{NO}_3\right)_2(\mathrm{~s}) \rightarrow 2 \mathrm{PbO}(\mathrm{s})+4 \mathrm{NO}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g})$

C) $\mathrm{N}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{NO}(\mathrm{g})$

D) $\mathrm{Cl}_2(\mathrm{~g})+2 \mathrm{OH}^{-}(\mathrm{aq}) \rightarrow \mathrm{ClO}^{-}(\mathrm{aq})+\mathrm{Cl}^{-}(\mathrm{aq})+4 \mathrm{H}_2 \mathrm{O}$ (l)

Answer: $2 \mathrm{~Pb}\left(\mathrm{NO}_3\right)_2(\mathrm{~s}) \rightarrow 2 \mathrm{PbO}(\mathrm{s})+4 \mathrm{NO}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g})$#