Interpretation:
The common product produced when reactions occur in aqueous solutions needs to be explained.
Concept introduction:

Answer to Problem 91A
Common product that is produced when reactions occur in aqueous solutions can be a gas, liquid (water) or a solid.
Explanation of Solution
In an aqueous solution, reactions may generate liquid, gas or a solid. For example, in a precipitation reaction, the solid precipitate is produced. In acid and base reaction, salt and water are produced. Here, water is in a liquid state.
Thus, the common products produced in chemical reactions in aqueous solutions are gas, liquid and solid.
In an aqueous solution, reactions may generate water (liquid), gas or a solid.
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