Question

A metal M does not liberate hydrogen from acids but reacts with oxygen to give a black colour product Identify M and the black colour product and also explain the reaction of M with oxygen

Answer 1

Answer:

The metal M is Copper(Cu).

Explanation:

Copper is less reactive than hydrogen as a result of which it cannot displace hydrogen from acids.

2 Cu (s) + O2 (g) ---> 2 CuO (s)

   CuO (s) + H2 (g) ---> Cu (s) + H2O (g)

   Heated copper metal reacts with oxygen to form the black copper oxide.  The copper oxide can then react with the hydrogen gas to form the copper metal and water.  When the funnel is removed from the hydrogen stream, the copper was still be warm enough to be oxidized by the air again.

Answer 2

Answer:

The Metal M is COPPER (cu).

It reacts with oxygen when heated to form a Black Coloured Compound called "COPPER(II)OXIDE."

Explanation:

2Cu+O2=2CuO