Question

Assertion : Changing of colour of copper from reddish brown to black on heating is an example of reduction.
Reason: Reduction is the process of removal of oxygen and addition of hydrogen.
A. Both A and R are true and R is correct explanation of the assertion.
B. Both A and R are true but R is not the correct explanation of the assertion.
C. A is true but R is false.
D. A is false but R is true.​

Answer 1

Answer is a Both A and R are true and R is the correct explanation of A

Answer 2

Answer:

Assertion is false but Reason is true

Explanation:

1) Copper powder, which is brown in color, changes to black when heated as it combines with oxygen to form a black oxide called Copper Oxide - CuO. So this an example of an oxidation reaction as oxygen is added to copper - 2Cu + O2 -----> 2CuO. Hence, as it is oxidation and not reduction the Assertion is false.

2) Reduction is the process of removal of oxygen from an element, addition of  hydrogen or addition/gain of ions. Hence, the Reason is true.