Phosphoric Acid - The last answer choice
An anion is an ion with a negative charge. The minus sign, when attached to the end of an ionic compound, indicates that this has a negative charge, while a plus sign indicates a positive charge.
O2- is the only compound listed that satisfied this. It is the anion.
Answer is 02-
Answer:
the discovery will always need to be tested more where if you're investigating you should already be in a more controlled environment
