Question

laboratory entrance exa
帐号:姓名:考试时间:60分钟
二.多选题(共12题,共24分)
2.among the following chemical reagents, ( ) is the more toxic. (2分)
□a.carbon tetrachloride
□b.ethanol
□c.hydrofluoric acid
□d.chloroform

Explanation:

• Carbon tetrachloride ($CCl_4$) is toxic. It can cause liver and kidney damage.
• Ethanol ($C_2H_5OH$) is relatively less toxic in small amounts (e.g., in alcoholic beverages in moderation).
• Hydrofluoric acid (HF) is highly toxic. It can penetrate skin and cause deep - seated burns and systemic toxicity due to its ability to chelate calcium.
• Chloroform ($CHCl_3$) is toxic. It can cause liver damage and has anesthetic effects, but hydrofluoric acid has a more severe and rapid - acting toxicity profile.

Answer:

C. hydrofluoric acid