Question

A metal m does not liberate hydrogen from acid but reacts with oxygen to give a black colour product identify the metal arm and the black coloured product and also explain the reaction with the help of with reaction of cl

Answer 1

The metal arm is made up of copper. The black coloured substance is copper oxide (CuO). Copper cannot liberate Hydrogen gas as it is less reactive than hydrogen in the reactivity series.  2Cu + O2 ---> 2CuO