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Question 1 of 10
1. Question
Why is Vacuum distillation the best technique to separate two chemicals with high boiling points?
Correct
The best technique to separate two chemicals with such high boiling points is vacuum distillation. This is because the decreased ambient pressure will allow the chemicals to boil at lower temperatures.
Incorrect
The best technique to separate two chemicals with such high boiling points is vacuum distillation. This is because the decreased ambient pressure will allow the chemicals to boil at lower temperatures.
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Question 2 of 10
2. Question
Leaded petrol used to be the primary source of air-borne lead emission. This problem has been overcome by?
Correct
Lead-free petrol (combining gas and air to compress and ignites the engine with a spark) is being used in automobiles. Thus, the emission of lead is prevented. MTBE(Methyl Tertiary Butyl Ether) prevents knocking but not lead. Ethanol-mixed petrol is CO free but not lead-free. TEL (Tetraethyl lead) prevents knocking but not lead.
Incorrect
Lead-free petrol (combining gas and air to compress and ignites the engine with a spark) is being used in automobiles. Thus, the emission of lead is prevented. MTBE(Methyl Tertiary Butyl Ether) prevents knocking but not lead. Ethanol-mixed petrol is CO free but not lead-free. TEL (Tetraethyl lead) prevents knocking but not lead.
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Question 3 of 10
3. Question
Choose the correct option of the following reactions as an example of auto reduction?
Correct
Cu2S acts as a reducing agent thus is an example of an Auto reduction. The sulfide ores of certain less electropositive metals like those of Hg (Mercury), Pb (Lead), Cu (Copper), etc. when heated in the air bring about the conversion of a part of the sulfide ore to oxide or sulfate (SO₄²-) which then reacts with the remaining sulfide to give the metal and SO2.
Incorrect
Cu2S acts as a reducing agent thus is an example of an Auto reduction. The sulfide ores of certain less electropositive metals like those of Hg (Mercury), Pb (Lead), Cu (Copper), etc. when heated in the air bring about the conversion of a part of the sulfide ore to oxide or sulfate (SO₄²-) which then reacts with the remaining sulfide to give the metal and SO2.
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Question 4 of 10
4. Question
From the following options choose the incorrect statement
Correct
Option C is wrong because ∆Tf will rely upon the character of the solvent and its Kf. The Change In Freezing Point DeltaTf (additionally Called The Freezing Point Depression, Td) is given via way of means of Delta Tf = (Tf Of Pure Solvent) – (Tf Of Solution) Studies Have Shown That Delta Tf Also Equals Kf * (molality Of Solution)in which Kf Is The Freezing
Incorrect
Option C is wrong because ∆Tf will rely upon the character of the solvent and its Kf. The Change In Freezing Point DeltaTf (additionally Called The Freezing Point Depression, Td) is given via way of means of Delta Tf = (Tf Of Pure Solvent) – (Tf Of Solution) Studies Have Shown That Delta Tf Also Equals Kf * (molality Of Solution)in which Kf Is The Freezing
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Question 5 of 10
5. Question
In order to make alcohol undrinkable pyramids and methanol are added to it. The resulting alcohol is called?
Correct
Denaturing can also be done by adding 0.5% pyridine (C5H5N), petroleum naphtha (intermediate hydrocarbon liquid stream derived from the refining of crude oil), CuSO4 (Copper(II) sulfate). Denatured alcohol (ethanol (C2H5OH) that’s been mixed with other ingredients) serves as a cleaning agent, fuel additive, sanding aid, exterminator, and solvent.
Incorrect
Denaturing can also be done by adding 0.5% pyridine (C5H5N), petroleum naphtha (intermediate hydrocarbon liquid stream derived from the refining of crude oil), CuSO4 (Copper(II) sulfate). Denatured alcohol (ethanol (C2H5OH) that’s been mixed with other ingredients) serves as a cleaning agent, fuel additive, sanding aid, exterminator, and solvent.
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Question 6 of 10
6. Question
From the following options choose the correct one which will react faster in the SN2 nucleophilic substitution reaction?
Correct
The carbocation (ion with a positively charged carbon atom) character in the transition state causes stabilization of the resonance and hence CH2 = CH – CH2 – Br (2- bromobutane) is the one that will react faster compared.
Incorrect
The carbocation (ion with a positively charged carbon atom) character in the transition state causes stabilization of the resonance and hence CH2 = CH – CH2 – Br (2- bromobutane) is the one that will react faster compared.
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Question 7 of 10
7. Question
From the following which is not the structural isomer of the compound C4H8?
Correct
The compound but-3-ene has a structural formula different from the above three and hence it is not a structural isomer of C4H8 (Butene, also known as butylene).
Incorrect
The compound but-3-ene has a structural formula different from the above three and hence it is not a structural isomer of C4H8 (Butene, also known as butylene).
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Question 8 of 10
8. Question
From the following compounds which compound explodes when contact with oxygen?
Correct
Cyclopropane ( cycloalkane with the molecular formula C₃H₆) reacts very aggressively at ordinary temperatures and hence it explodes when comes in contact with oxygen (O). They possess high reactivity due to their inherent strain because the orbitals involved in bonding are forced to deviate from the ideal sp3 tetrahedral angle
Incorrect
Cyclopropane ( cycloalkane with the molecular formula C₃H₆) reacts very aggressively at ordinary temperatures and hence it explodes when comes in contact with oxygen (O). They possess high reactivity due to their inherent strain because the orbitals involved in bonding are forced to deviate from the ideal sp3 tetrahedral angle
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Question 9 of 10
9. Question
Identify the incorrect statement regarding cyclobutane.
Correct
Cyclobutane (cycloalkane and organic compound with the formula (CH₂)₄) is a compound that has no commercial and medicinal importance. But for a variety of purposes, the complex derivative forms of cyclobutane (CH₂)₄) are used.
Incorrect
Cyclobutane (cycloalkane and organic compound with the formula (CH₂)₄) is a compound that has no commercial and medicinal importance. But for a variety of purposes, the complex derivative forms of cyclobutane (CH₂)₄) are used.
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Question 10 of 10
10. Question
Does conjugated diene react with which among the following to form cyclohexene?
Correct
Dienophile on reaction with conjugated dienes forms cyclohexene and this reaction is referred to as Diels-alder reaction. The Diels Alder reaction converts a diene (a covalent compound that contains two double bonds) and an alkene (commonly electron-poor, known as a “dienophile”) right into a 6-membered ring containing an alkene (cyclohexene).
Incorrect
Dienophile on reaction with conjugated dienes forms cyclohexene and this reaction is referred to as Diels-alder reaction. The Diels Alder reaction converts a diene (a covalent compound that contains two double bonds) and an alkene (commonly electron-poor, known as a “dienophile”) right into a 6-membered ring containing an alkene (cyclohexene).