Which method is used to seperate following mitures? red and blue from solution

Chromatography

Explanation:

Chromatography is the technique for qualitative or quantitative separation of the components of mixtures in a solution

It uses TWO phases: MOBILE phase (gas or liquid), and a STATIONARY phase (liquid or solid).

You will observe differences in the the rates of migration of the RED and BLUE compounds between the two phases during separation.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.