(1) Words or conduct relevant to the creation of an express warranty and words or conduct tending to negate or limit warranty shall be construed wherever reasonable as consistent with each other; but subject to the provisions of IC 26-1-2-202 on parol or extrinsic evidence, negation or limitation is inoperative to the extent that such construction is unreasonable. (2) Subject to subsection (3), to exclude or modify the implied warranty of merchantability or any part of it the language must mention