Question

Which of the following does not change on occurrence of a chemical reaction
(a) Colour
(b) temperature
(c) physical state
(d) mass​

Answer 1

Explanation:

A physical change, such as a state change or dissolving, does not create a new substance, but a chemical change does. ... In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed.

Answer 2

Answer:

When chemical reaction occurs, mass of the substances involved is conserved. This is called law of conservation of mass (d).