Question
Which of the following metal is NOT used in wood preservatives?
The correct answer is
Pb
To determine which metal is NOT used in wood preservatives, we need to consider the common metals utilized in the treatment of wood and their purposes in preservation.
- Copper (Cu): Copper is widely used in wood preservation. It acts as a fungicide and a bactericide, protecting wood from fungal decay and insect attacks. Common compounds include Copper Chrome Arsenate (CCA).
- Chromium (Cr): Chromium is used mainly in combination with other metals like copper and arsenic in wood preservatives. It helps to fix the preservative chemicals into the wood fibers, making the wood resistant to leaching and decay.
- Arsenic (As): Arsenic is another component of CCA preservatives. It provides protection against insects and inhibits fungal growth in wood.
- Lead (Pb): Lead is not commonly used in wood preservatives. It is toxic and environmentally hazardous, and its use in such applications is largely prohibited or restricted.
Based on the above analysis, the metal Lead (Pb) is not typically used in wood preservatives due to its toxic nature and environmental impact. Therefore, the correct answer is:
Pb (Lead)
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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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