Question
Which of the following statement is incorrect ?
The correct answer is
Cadmium is a criteria pollutant
Analyzing Incorrect Toxicity Statement
This question requires identifying the incorrect statement among the given options regarding the toxicity and classification of specific substances. Let's analyze each statement:
- Chromium (VI) toxicity: Statement 1 is correct. Chromium (VI) compounds are well-known for their high toxicity and carcinogenic properties.
- Methyl mercury toxicity: Statement 2 is correct. Methyl mercury is recognized as the most toxic species of mercury, readily crossing biological membranes and accumulating in the food chain.
- Arsenic (III) vs. Arsenic (V) toxicity: Statement 3 is correct. Arsenic in the +3 oxidation state (e.g., arsenite) is generally more toxic than Arsenic in the +5 oxidation state (e.g., arsenate) because it interferes more readily with cellular processes.
- Cadmium classification: Statement 4 claims that Cadmium is a criteria pollutant. This statement is incorrect. While Cadmium is a highly toxic heavy metal and regulated under environmental laws (like the Clean Air Act as a Hazardous Air Pollutant - HAP), it is not one of the six specific "criteria pollutants" for which the EPA sets National Ambient Air Quality Standards (NAAQS). The criteria pollutants are ozone, particulate matter, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead.
Therefore, the incorrect statement is that Cadmium is a criteria pollutant.
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Important Questions from Toxic Chemicals - Teaching
- Which of the following is most important analog of DDT that have same general size, shape and possess the same insecticidal properties but is more biodegradable and less bioaccumulative ?
- A toxic substance is present at 10 mg/l (=10ppm) level in water. Arrange the following subjects (A, B, C, D and E) in decreasing order of their daily dose in (mg kg⁻¹ day⁻¹) of this substance.
A. Subject taking 2 liters of water per day and have body weight of 50 kg.
B. Subject taking 2 liters of water per day and have body weight of 70 kg.
C. Subject taking 1 liters of water per day and have body weight of 10 kg.
D. Subject taking 5 liters of water per day and have body weight of 100 kg.
E. Subject taking 1 liters of water per day and have body weight of 70 kg.
Choose the correct answer from the options given below: - Which of the following metal is NOT used in wood preservatives?
In dose-response curve of chemical substances, there exists a dose below which none of the animal is affected, which is called as:
- The most common form of lead present in pesticide is :
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