Pure air is a mixture of several gases that are invisible and odorless. Consists of 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide.
Place a burning splint near the opening of a test tube. If a popping noise occurs, it's probably hydrogen. Place a glowing splint in the test tube, and if it reignites, it could be oxygen. Place a burning splint into a test tube, and if it goes out, it could be carbon dioxide.
Answer:
A strong acid
Any strong acid (such as HCl, HBr, or 
) will completely dissociate forming a very weak conjugate base and H3O which will be acidic.
The answer would be C as in cat and D as in dog your welcome i hope this help
