What is the ionic equation for the halide ion test involving NaCl?

The correct answer involves the formation of a precipitate when a halide ion test is conducted. In this specific case, sodium chloride (NaCl) serves as a source of chloride ions (Cl⁻) in solution. When silver nitrate (AgNO₃) is added to this solution, the silver ions (Ag⁺) react with the chloride ions to form silver chloride (AgCl), which is an insoluble salt that precipitates out of solution.

The ionic equation highlights the essential reactants and products while omitting the spectator ions, which do not participate in the chemical change. Therefore, it specifically shows the interaction between the silver ions and chloride ions, leading to the formation of the solid silver chloride. This demonstrates the principle of a precipitation reaction, where two aqueous solutions combine to produce an insoluble compound.

The other choices involve either different forms of sodium or chloride compounds or suggest incorrect reactants. They do not accurately depict the ionic equation for the formation of silver chloride from silver ions and chloride ions in the context of the halide ion test. This reaction is fundamental in qualitative analysis for detecting halide ions and is a key point in understanding precipitation reactions in chemistry.