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Dear Student,

The metal(P) is Copper(Cu) and Q is Copper oxide (CuO)
           Cu      +      O₂$\stackrel{∆}{\to }$      CuO
​​​​​​(Reddish brown P)                    (black Q)-It is a metal oxide(basic)

CuO + H₂ $\stackrel{∆}{\to }$ Cu + H₂O 

Regards