What colorless crystalline substance, when interacting with hydrochloric acid, releases gas with an unpleasant odor?

You can take any reaction as a basis, but I will give an example with the interaction of sodium sulfite with hydrochloric acid and as a result we get the following products: table salt (or sodium chloride), water and directly sulfur oxide gas (4) or it is sulfur dioxide, namely he will have an unpleasant smell
Na2SO3 + 2HCl = 2NaCl + SO2 + H2O.



One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.