The atmospheric gas that forms a mild acid when dissolved in water is

carbon dioxide
oxygen
aluminum
sulfur

What do you think it is? I'll give you a hint, it's either A or C. Don't guess, just try.

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

Answerthe same as;