When the powderof a common metal is heated in an open china dish its colour turns black However , - Science - Chemical Reactions and Equations

Question

When the powderof a common metal is heated in an open china dish
its colour turns black However , when hydrogen is passed over the
hot black substance formded it regains its orignal colour
i) What type of chemical reaction takes place in each of the two
given steps
ii) Write balanced chemical equations for both reactions
iii) Name the metal initially taken in the powered form

Manasa Hegde · Accepted Answer

Dear Student,

i) When the metal is burnt in open air, it undergoes oxidation and
forms metal oxide When the hydrogen is passed through the metal
oxide, it undergoes reduction and forms the metal and water

ii) 2Cu + O2 →2CuO 
oxidationCuO + H2→Cu +H2O  reduction

iii) The metal initially taken in the powdered form is Copper

Regards,