Question

A substance in solution is indicated in a chemical equation by the symbol (s).

• A. True
• B. False

Answer 1

The correct option is B False

No, It's not always true.

Solutions are homogeneous mixtures of two or more than two components.

• Homogenous means the uniformity of composition and properties is the same throughout the mixture.
• A substance in a solution means a solute is dissolved in a solvent.
• As the solutions are homogenous, therefore the state of the substance will be similar to that of the solution.

For example,

• A solution of Sodium chloride($\mathrm{NaCl}$), which is initially in solid-state(s) when added into water(${\mathrm{H}}_2\mathrm{O}$) its state will change to aqueous. It is a type of solid in a liquid solution.
• $\mathrm{NaCl}\left(\mathrm{s}\right)\stackrel{{\mathrm{H}}_2\mathrm{O}}{\to }{\mathrm{Na}}^{+}\left(\mathrm{aq}\right)+{\mathrm{Cl}}^{-}\left(\mathrm{aq}\right)$
• Similarly, solid in solid solutions are also possible like Copper($\mathrm{Cu}$) dissolved in Gold($\mathrm{Au}$).
• Air is an example of gas in gas solution.

So, the statement a substance in solution is indicated in a chemical equation by the symbol (s) is not always true. As solute can be solid, liquid, or gas in a solution depending on the type of solution.

Hence, the given statement is false.