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Identify X and Y in the following reacti...

Identify `X` and `Y` in the following reactions .
`PbS underset("in air") overset (Heat) (rarr) (X)`
`(X) + PbS overset (Y) (rarr) Pb+SO_(2)`.

A

`DeltaHlt0`

B

`DeltaHgt0`

C

`DeltaH=0`

D

`DeltaH` whose sign can be determined

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