Question

are shiny brown substance on heating turns black and form a compound A and B. on passing hydrogen gas it again turn shiny brown identify a and b write down chemical reaction involved​

Answer 1

Answer:

shiny substance is Copper (Cu)

2Cu +O₂ = 2CuO

when hydrogen is passed through CuO

CuO + H₂ = Cu + H₂O

hope its helpful friend!!