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Question 1 of 10
1. Question
From the following statements choose the incorrect statement in the case of environmental chemistry?
Correct
Allotropes of Oxygen- O2 (Dioxygen) and O3 (Ozone)
Infrared radiation is most important for heating up the atmosphere and the surface of the earth. These rays have a high wavelength and low frequency and are not very harmful. Ozone does not hinder infrared radiation.Incorrect
Allotropes of Oxygen- O2 (Dioxygen) and O3 (Ozone)
Infrared radiation is most important for heating up the atmosphere and the surface of the earth. These rays have a high wavelength and low frequency and are not very harmful. Ozone does not hinder infrared radiation. -
Question 2 of 10
2. Question
The Third law of thermodynamics provides a method to evaluate which property?
Correct
The Third Law of Thermodynamics is involved with the restricting conduct of structures because of the temperature methods absolute 0. Most thermodynamics calculations use handiest entropy differences, so the 0 factors of the entropy scale are regularly now no longer important. However, the Third Law tells us approximately completeness because it describes the situation of 0 entropy.
Incorrect
The Third Law of Thermodynamics is involved with the restricting conduct of structures because of the temperature methods absolute 0. Most thermodynamics calculations use handiest entropy differences, so the 0 factors of the entropy scale are regularly now no longer important. However, the Third Law tells us approximately completeness because it describes the situation of 0 entropy.
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Question 3 of 10
3. Question
Which of the following statements apply when a molecule is converted from anti conformation to gauche conformation?
Correct
In the maximum strong conformation, the 2 methyl groups lie as some distance other than every different as viable with a dihedral attitude of one hundred eighty degrees. This specific staggered conformation is known as anti. The gauche shape is much less strong than the anti-shape through 0.9 kcal/mol because of steric drawback among the 2 methyl groups.
Incorrect
In the maximum strong conformation, the 2 methyl groups lie as some distance other than every different as viable with a dihedral attitude of one hundred eighty degrees. This specific staggered conformation is known as anti. The gauche shape is much less strong than the anti-shape through 0.9 kcal/mol because of steric drawback among the 2 methyl groups.
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Question 4 of 10
4. Question
Choose the correct formula from the following options which represent white phosphorous?
Correct
The maximum vital shape of elemental phosphorus from the attitude of applications and chemical literature is white phosphorus. It includes tetrahedral P4 molecules, wherein every atom is certain to the opposite 3 atoms through a single bond. This P4 tetrahedron is likewise found in liquid and gaseous phosphorus as much as the temperature of 800 °C while it begins offevolved decomposing to P2 molecules.
Incorrect
The maximum vital shape of elemental phosphorus from the attitude of applications and chemical literature is white phosphorus. It includes tetrahedral P4 molecules, wherein every atom is certain to the opposite 3 atoms through a single bond. This P4 tetrahedron is likewise found in liquid and gaseous phosphorus as much as the temperature of 800 °C while it begins offevolved decomposing to P2 molecules.
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Question 5 of 10
5. Question
From the following impurities, which impurity in drinking water causes the ‘Bamboo Spine’?
Correct
Ankylosing Spondylitis is chronic, inflammatory arthritis and autoimmune disease that mainly affects joints in the spine and the sacroiliac joints in the pelvis. It tends to affect the spine and in late stages, the spine will fuse and this has given rise to the term “bamboo spine”. It is mainly caused due to impurities in drinking water associated with fluorides.
Incorrect
Ankylosing Spondylitis is chronic, inflammatory arthritis and autoimmune disease that mainly affects joints in the spine and the sacroiliac joints in the pelvis. It tends to affect the spine and in late stages, the spine will fuse and this has given rise to the term “bamboo spine”. It is mainly caused due to impurities in drinking water associated with fluorides.
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Question 6 of 10
6. Question
From the following which reagents should be used to prepare tert-butyl ethyl ether?
Correct
In the reaction when ethyl bromide(CH3CH2Br) is added to potassium tert-butoxide ((CH3)3-O– + K), the product is ethyl tert-butyl ether(CH3)3-O-CH2CH3).
CH3CH2Br + (CH3)3-O– + K → (CH3)3-O-CH2CH3.Incorrect
In the reaction when ethyl bromide(CH3CH2Br) is added to potassium tert-butoxide ((CH3)3-O– + K), the product is ethyl tert-butyl ether(CH3)3-O-CH2CH3).
CH3CH2Br + (CH3)3-O– + K → (CH3)3-O-CH2CH3. -
Question 7 of 10
7. Question
When acid cleavage of phenyl propyl ether with excess concentrated HBr at an elevated temperature occurs the pair of products formed is?
Correct
In the reaction, Ether + HBr —–> Alkyl bromide + Alcohol. Halide attacks at much less hindered site to provide alkyl halide. The reaction between (ethyl phenyl ether (C8H10O) + Hydrogen bromide (HBr)/Heat/Water) Gives Phenol (C6H6O) + Bromoethane (C2H5Br).
Incorrect
In the reaction, Ether + HBr —–> Alkyl bromide + Alcohol. Halide attacks at much less hindered site to provide alkyl halide. The reaction between (ethyl phenyl ether (C8H10O) + Hydrogen bromide (HBr)/Heat/Water) Gives Phenol (C6H6O) + Bromoethane (C2H5Br).
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Question 8 of 10
8. Question
When keeping ether in contact with air for a long time, what will be obtained from the following?
Correct
When ether saved withinside the presence of air or oxygen, ethers commonly generally tend to form explosive peroxides, which include diethyl ether peroxide. The reaction is accelerated thru light, steel catalysts, and aldehydes.
R−O−R’ + O2 (dioxygen)/light → C2H5 (Ethyl radical)−OCH(CH3)−O−OH.Incorrect
When ether saved withinside the presence of air or oxygen, ethers commonly generally tend to form explosive peroxides, which include diethyl ether peroxide. The reaction is accelerated thru light, steel catalysts, and aldehydes.
R−O−R’ + O2 (dioxygen)/light → C2H5 (Ethyl radical)−OCH(CH3)−O−OH. -
Question 9 of 10
9. Question
From the following which is the incorrect statement about ethers?
Correct
Although they may be considered used as extraction solvents ethers, are considerably flammable and pretty really form peroxides thru loose radical oxidation. Ether oxygen ( follow the general formula R-O-R’)can be observed in an open-chain or as part of a cyclic system.
Incorrect
Although they may be considered used as extraction solvents ethers, are considerably flammable and pretty really form peroxides thru loose radical oxidation. Ether oxygen ( follow the general formula R-O-R’)can be observed in an open-chain or as part of a cyclic system.
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Question 10 of 10
10. Question
From the following which is the correct statement for the cyclic ether are miscible in the water?
Correct
The cyclic ethers along with tetrahydrofuran ((CH₂)₄O) and 1,4-dioxane (is a heterocyclic organic compound)are miscible in water due to the extra uncovered oxygen atom for hydrogen bonding compared to linear aliphatic ethers.
Incorrect
The cyclic ethers along with tetrahydrofuran ((CH₂)₄O) and 1,4-dioxane (is a heterocyclic organic compound)are miscible in water due to the extra uncovered oxygen atom for hydrogen bonding compared to linear aliphatic ethers.