Question

Which sample of matter is classified as a solution? 1. H2O(s) 2. H2O(l) 3. CO2(g) 4. CO2(aq)

Answer 1

4. CO2(aq)

Because of the symbol aq, meaning aqueous, which means in solution.

Answer 2

Answer : Option 4)
`CO_(2)_((aq))`

Explanation :
`CO_(2)_((aq))` is the only sample of matter which can be classified as a solution. As the solution can be defined as a liquid mixture which contains a minor component (the solute) that is uniformly distributed within the major component (the solvent).

In this case, the solute is
`CO_(2)` which is dissolved in water which acts as an solvent. Also, it has a subscript which is aq. which means aqueous, is often given to the solution in which the solvent is water.

Therefore,
`CO_(2)_((aq))` is the correct answer.