Question

change in color
and change in state
​

Answer 1

Change in colour and change in state is the characteristics of chemical reaction.

CHANGE IN COLOUR

The chemical reaction between citric acid and purple colored potassium permanganate solution is characterized by a change in color from purple to colorless.

CHANGE IN STATE

Candle is a solid. When it is burned it forms water and carbon dioxide. Water is a liquid. Carbon Dioxide is a gas.

THANKS

Answer 2

change in colour & change in state is refers to the chemical change,

chemical change is something in which two or more new substances are form.

It changes the colour & state of any substances.

as an example : When papers burn new substance is form as "ash" differ in colour than earlier one.