Question

OR Read and answer the following: A table spoon full of copper powder in China dish was heated strongly which resulted into a black substance. A pinkish brown coating was found over the black substance when hydrogen gas was passed over it 1) What is the name of black substance ? (1) 2) Name the pinkish brown substance 3) Name the type of chemical reaction in the first situation and then in the second situation (2) 4) Nume the type of reactions if both happened simultaneously .answer


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Answer 1

Answer:

Explanation:

When the copper powder is heated in a china dish the copper powder surface becomes coated with black colour substance due to the formation of copper oxide by surface oxidation. The black colour is due to the formation of this copper (II) oxide as the copper comes in contact with the air.