Assertion: Water and carbon dioxide are known as compounds. Reason: Water and carbon dioxide is heterogeneous in nature.

A
Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
B
Both Assertion and Reason are true, but Reason is not the correct explanation of the Assertion
C
Assertion is true, but Reason is false
D
Assertion is false, but Reason is true

Solution:

Assertion is true, but Reason is false.
Assertion: Both water and carbon dioxide are compounds because their elemental compositions are fixed, and they cannot be physically divided into smaller parts.
Hydrogen and oxygen are always present in a fixed mass ratio of

1 : 8

while creating water. When carbon and oxygen are combined in a constant mass ratio of

3 : 8

Carbon dioxide is created. As a result, the Assertion is true.
Reason: Carbon dioxide and water are pure chemicals that combine to form compounds. Pure substances can be chemically decomposed. Carbon dioxide can dissolve in water. They cannot be categorised as heterogeneous mixtures as a result.