Question

Assertion: When copper powder is heated in air, it turns black.
Reason:

Copper reacts with H2S gas of the air forming black CuS.​

Answer 1

Answer:

This black substance formed on the surface is because of the process called surface oxidation. Upon heating, the copper metal melts gradually and turns black on the surface. This is because the copper powder present in the china dish reacts with the atmospheric oxygen and forms copper (II) oxide.

Answer: When h2s gas is passed through copper sulphate solution, a black insoluble substance called precipitate, of cus is fomed along with aquaeous h2so4 acid.

Hope it helps you!!

Answer 2

Answer:

A is true best R is False

Explanation:

A is true best R is False