A Sample Contains Ba₃(PO₄)₂, CdS, AgCl, NH₄Cl, and ZnS

question 12

Multiple Choice

A sample contains Ba₃(PO₄) ₂, CdS, AgCl, NH₄Cl, and ZnS. Identify the precipitate formed after the addition of 6 mol L^-1 HCl followed by the addition of H₂S and 0.2 mol L^-1 HCl.

• A) Ba₃(PO₄)₂
• B) CdS
• C) AgCl
• D) NH₄Cl
• E) ZnS

---

Definitions:

COOH

Refers to the carboxyl group, a functional group consisting of a carbon atom double-bonded to an oxygen atom and single-bonded to a hydroxyl group (OH), found in organic acids.

Hexanoic Acid

A colorless, oily fatty acid with an odor that resembles that of goats or other barnyard animals, used in flavoring and manufacturing.

Valeric Acid

A saturated fatty acid with the chemical formula C5H10O2, present in valerian root and used in flavoring.

Structural Formula

A representation of the molecular structure of a chemical compound, showing how atoms are arranged within the molecule.