Which of the following represents the possible structure of an OXY acid? So if we take a look at the first one, the first one is sodium nitrate. There is no H⁺ ion involved within the structure, so it can't represent an acid, let alone an oxy acid.

For the next one, it's covalent. It has hydrogen in the beginning, so it is an acid. It has the presence of oxygen, so it is an oxy acid here. This one is called formic acid.

By the way, CC is not an acid because in this one it represents an ionic base. It is a positive metal cation potassium ion connected to hydroxide ion which is a basic anion. OK, so this is a base and then find the last one.

It is covalent, only nonmetals together. It starts with a hydrogen, so it is an acid, but it has no oxygen, so it is a binary acid, not an oxy acid. So the only one that's an oxy acid here is option B.