A white salt containing an unknown metal has the formula MCI and gives a lilac flame during a flame test. the salt could be...

Option C, KCl

Explanation:

It is the KCl that gives a lilac flame during the flame test.

The color given by different salt during the flame test are as follows -

a) KCl - Lilac

b) NaCl - yellow

c) MgCl - Orange-red

d) LiCl - red (crimson)

Hence, option C is correct

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.