In a chemical equation, the notations (aq) represents:

Correct option is B

​The correct answer is (B)  Aqueous

• ​In a chemical equation, the notation (aq) stands for aqueous, which means that the substance is dissolved in water.
• It indicates that the compound is present as ions or molecules in a water-based solution.​
  
• The (aq) symbol represents the physical state of the substance in the reaction, showing it is in an aqueous solution.
• For example, in NaCl(aq), sodium chloride is dissolved in water.