Identify A and B (Compound/reaction condition)
\( \mathrm{P} \)
\[
...
Identify A and B (Compound/reaction condition)
\( \mathrm{P} \)
\[
\mathrm{PbS} \underset{\text { in air }}{\stackrel{\text { Heat }}{\longrightarrow}} \mathrm{A}+\mathrm{PbS} \stackrel{\mathrm{B}}{\longrightarrow} \mathrm{Pb}+\mathrm{SO}_{2}
\]
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