A poorly written question. -3 is correctly identified; however, since that is not correct we don't know what else might be wrong since the first quantum number is wrong. But the question implies, at least, that there are others errors.
#2 is ok but you need to say m(l) = 1/2 because you can't have halves FOR m(l). [Note: you can have halves for m(s)]
Q: Identify all that is incorrect about the set of four quantum numbers and explain why. {-3, 2, 1, 1/2}
A. -3 because there can't be a negative orbital.
Q: Identify all that is incorrect about the set of four quantum numbers and explain why. { 3, 2, 1/2, 1/2}
A. m(l) = 1/2 because you can't have halves.
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