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17 April, 09:57

In laboratory, your TA makes a statement about the toxicity of the fumes of a reaction. What does the term toxicity mean?

A. The sum of adverse effects resulting from exposure to a material, normally by the mouth, skin, or respiratory tract.

B. A substance or agent that can interfere with normal embryonic development.

C. A substance or agent capable of causing or producing cancer in mammals.

D. The dose found to be lethal in 50 percent of a group of test animals when administered by the specified route.

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  1. 17 April, 10:15
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    A.

    Explanation:

    A toxic substance is a substance that can cause some harmful effects when a person is exposed to it. The sum of all adverse effects is called the toxicity of a substance. As higher is the toxicity, as dangerous is the substance. The effects can be observed in the mouth, the eyes, the skin, the tract respiratory, the brain, etc.

    A substance or agent that can interfere with normal embryonic development is called teratogenic.

    A substance or agent capable of causing or producing cancer in mammals is called carcinogenic.

    The dose found to be lethal in 50 percent of a group of test animals when administered by the specified route is called LD50 (Lethal Dose 50).
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