Question
Consider the following four statements about benzo[a]pyrene :
(a) It is a group 1 carcinogen
(b) It is a polycyclic aromatic hydrocarbon
(c) Its molecular formula is $\text{C}_{20}\text{H}_{12}$
(d) It has four benzene rings
Choose the correct code :
The correct answer is
(a), (b) and (c) only
Solution Analysis: Benzo[a]pyrene Statements
This question requires evaluating four statements about the chemical compound benzo[a]pyrene to determine the correct combination.
Evaluating Each Statement
- Statement (a): It is a group 1 carcinogen
The International Agency for Research on Cancer (IARC) classifies benzo[a]pyrene as a Group 1 carcinogen, indicating it is known to be carcinogenic to humans. Therefore, statement (a) is TRUE. - Statement (b): It is a polycyclic aromatic hydrocarbon
Benzo[a]pyrene is a prominent member of the polycyclic aromatic hydrocarbon (PAH) family, identified by its structure containing multiple fused aromatic rings. Thus, statement (b) is TRUE. - Statement (c): Its molecular formula is C20H12
The correct molecular formula for benzo[a]pyrene is indeed latex notation: $\text{C}_{20}\text{H}_{12}$. This statement is TRUE. - Statement (d): It has four benzene rings
While benzo[a]pyrene has a fused five-ring structure, this statement is considered FALSE based on the context required to select the correct option.
Identifying the Correct Code
Based on the evaluation:
- Statements (a), (b), and (c) are TRUE.
- Statement (d) is FALSE.
The correct option must therefore include only the true statements (a), (b), and (c).
Conclusion
The option matching the true statements (a), (b), and (c) is the correct answer.
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Important Questions from Toxic Chemicals - Teaching
- Match the LIST-I with LIST-II
LIST-I LIST-II A. Dichlorvos I. Type A organophosphate insecticide B. Melathion II. Type B organophosphate insecticide C. Parathion III. Type C organophosphate insecticide D. Lindane IV. Organochlorine Insecticide
Choose the correct answer from the options given below: - 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: - Given below are two statements. One labelled as Assertion (A) and the other labelled as Reason (R) :
Assertion (A) : The fundamental goal of a dose - response assessment is to obtain a mathematical relationship between the amount of a toxicant that a human is exposed to and the risk that there will be.
Reason (R) : To apply dose - response data obtained from animal bioassay to humans, a scaling factor must be introduced. Choose the correct answer : - Which of the following statement is incorrect ?
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