Question
The most common form of lead present in pesticide is :
The correct answer is
Lead arsenate
Lead Pesticide Forms Explained
The question asks for the most common form of lead found in pesticides. Historically, certain lead compounds were widely used due to their effectiveness in controlling pests.
Lead Arsenate: The Primary Pesticide
- Lead arsenate (chemical formula PbHAsO4 or Pb3(AsO4)2) was extensively used as an insecticide and herbicide, particularly in the late 19th and early 20th centuries.
- Its effectiveness against a broad range of insects, especially chewing insects like the gypsy moth and codling moth, made it a staple in fruit orchards and agriculture.
- Although effective, its high toxicity and environmental persistence led to significant restrictions and eventual bans in many countries.
Other Lead Compounds
- Lead acetate (Pb(CH3COO)2), also known as sugar of lead, has some historical uses but was less common specifically as a major pesticide compared to lead arsenate.
- Lead azide (Pb(N3)2) is primarily used as a primary explosive initiator (detonator) and has no application as a pesticide.
- Lead telluride (PbTe) is a semiconductor material used in thermoelectric devices and infrared detectors, not in pesticides.
Therefore, lead arsenate stands out as the most historically common and significant form of lead used in pesticide applications.
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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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