Which of the following is an anion? question 20 options: o2- al3+ mg2+ h

Anion is an atom with a negative charge
so in this case it woulld be O2-

The answer is c) pyrite

There is no reason to think the results are biased or not conducted properly but you should not assume the results are correct just because they were done in a laboratory so the answer would be c. it is likely to be reliable because the results support the conclusion presented.