Question

二.多选题(共12题,共24分)
4.which of the following reagents are toxic? (2分)
□a.hg
□b.benzene
□c.chloroform
□d.hydrogen peroxide

Explanation:

Step1: Analyze each option

• Option A:

Mercury (Hg) is a toxic heavy - metal. It can cause damage to the nervous system, kidneys, etc. when exposed.

• Option B:

Benzene is a known carcinogen and is toxic. It can cause bone - marrow depression and leukemia.

• Option C:

Chloroform is toxic. It can cause liver and kidney damage.

• Option D:

Hydrogen peroxide (\(H_2O_2\)) is not toxic in the sense of being a persistent or highly toxic substance like the above - mentioned ones. In dilute solutions (e.g., 3% - 6% solutions used as a disinfectant), it is relatively safe. It decomposes into water (\(H_2O\)) and oxygen (\(O_2\)).

Answer:

A. Hg, B. benzene, C. chloroform