Question

一.单选题(共20题,共40分)
37.the following ( ) are not highly toxic chemicals. (2分)
oa.potassium cyanide
ob. mercuric chloride
oc. hydrazine
od. formaldehyde

Explanation:

• Potassium cyanide (\(KCN\)): It is extremely toxic. Cyanide ions (\(CN^-\)) can bind to the iron in cytochrome oxidase in cells, inhibiting cellular respiration.
• Mercuric chloride (\(HgCl_2\)): It is highly toxic. Mercury ions (\(Hg^{2 +}\)) can disrupt many biological processes, such as enzyme function.
• Hydrazine (\(N_2H_4\)): It is a highly toxic and volatile liquid. It can cause damage to the liver, kidneys, and central nervous system.
• Formaldehyde (\(HCHO\)): It is toxic but not in the same highly toxic category as the above - three. It is a known carcinogen and can cause irritation to the eyes, nose, and throat, but its acute toxicity level (in terms of the speed and severity of lethal effects in small doses) is relatively lower compared to potassium cyanide, mercuric chloride, and hydrazine.

Answer:

D. formaldehyde