Hexavalent chromium is used in which industries?

• A. Electroplating
• B. Pigments
• C. Stainless steel production
• D. All of the above

Answer: (D)

Hexavalent chromium compounds are used for their ability to form durable, protective, and colorful finishes, which makes them valuable across several manufacturing steps. In electroplating, Cr(VI) baths deposit a thin, hard chromium layer on metal parts, giving excellent wear resistance and a bright, protective coating. In pigments, Cr(VI) compounds are used to produce vivid inorganic pigments, such as chrome yellow and related chromates, which are employed in paints, coatings, and inks. In stainless steel production, chromium is the key alloying element that provides corrosion resistance, and Cr(VI) chemistry can appear in certain surface treatments and finishing steps that enhance protective oxide films or facilitate plating processes. Because hexavalent chromium plays a role in all these contexts, the best answer is that it’s used in all of the above. Remember, Cr(VI) is toxic and tightly regulated, so safety and exposure controls are essential in any use.