Final answer:
The correct a) reference range for chloride is 96-106 mmol/L with critical values being below 90 or above 110 mmol/L.
Step-by-step explanation:
The reference range for chloride in the blood is typically 98-107 mmol/L. Critical values, which may indicate a serious medical condition, would be a level <90 mmol/L (hypochloremia) or >110 mmol/L (hyperchloremia). Therefore, the answer to the question is (a) Reference range: 96-106 mmol/L; Critical values: <90 or >110 mmol/L.