A chemical change may involve (d) any or all of the above – a change in color, temperature, or evolution of gas.
Explanation: Chemical reactions can manifest in various ways, including color changes like when an apple browns upon exposure to air, temperature changes as heat is released or absorbed during a reaction, or the release of a gas like when baking soda reacts with vinegar.
Why other options are incorrect:
(a) change in colour only:
While color change is a common indicator of a chemical reaction, it’s not the only one.
(b) change in temperature only:
Temperature changes can also accompany a chemical reaction, but they are not the sole indicator.
(c) evolution of gas only:
Gas evolution is a characteristic feature of certain chemical reactions, but not all chemical changes involve gas release.