Question

Assertion : During a chemical reaction , the sum of the masses of the reactants
and products remains unchanged .
Reason : In a pure chemical compound , elements are always present in definite
proportion by mass. This is known as law of definite proportion.
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:

a)both a and r are true

Explanation:

hope it helps ;-)

Answer 2

• Answer:

both a and r are teue