Question

a brown metal x on heating in air forms black substance y. when hydrogen is passed over heated y it again changes into x. a) name x and y b)name the type of reactions ocurring during both changes c)write the equations for the reactions

Answer 1

Hey Guys,

a) Metal X is Copper which is reddish brown in colour.

b & c ) Oxidation reaction :-
2Cu +O2 = 2 CuO
( Cupric oxide )
Reduction reaction :-
2CuO + 2H2 = 2Cu + 2H2O


Thanks.