Hydrochloric acid (HCl) is a highly corrosive, strong acid that can dissolve a wide variety of materials. However, there are a few substances that are resistant to HCl, including platinum.

Platinum is a noble metal that is highly resistant to corrosion. This is because platinum has a very stable electron configuration, which makes it difficult for other atoms to react with it. As a result, platinum is not affected by HCl acid.

In fact, platinum is so resistant to corrosion that it is often used to make laboratory equipment that is used to handle HCl acid. Platinum crucibles, beakers, and other containers are commonly used in chemistry labs because they can withstand the corrosive effects of HCl acid.