Given below are two statements: Statement I: Carbon monoxide is highly poisonous because it forms a carboxyhaemoglobin complex which is about 300 times more stable than the oxygen-haemoglobin complex. Statement II: Gaseous CO ₂ is extensively used as a refrigerant for ice creams and frozen food. In the light of the above statements, choose the most appropriate answer from the options given below:

Step-by-step solution

Statement I is correct. Carbon monoxide is highly poisonous because of its ability to form a complex with haemoglobin (carboxyhaemoglobin), which is about 300 times more stable than the oxygen-haemoglobin complex. This prevents haemoglobin in the red blood corpuscles from carrying oxygen round the body. Statement II is incorrect. Solid CO ₂ (known as dry ice), not gaseous CO ₂ , is used as a refrigerant for ice cream and frozen food. Answer: Statement I is correct but Statement II is incorrect