Q. What is the main type of reaction that haloalkanes undergo? (2020)
A.
Addition
B.
Substitution
C.
Elimination
D.
Redox
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Solution
Haloalkanes primarily undergo nucleophilic substitution reactions due to the presence of a good leaving group (halogen).
Correct Answer: B — Substitution
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Q. What is the main use of aluminum in construction? (2020)
A.
Electrical wiring
B.
Structural components
C.
Piping
D.
Insulation
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Solution
Aluminum is widely used in construction for structural components due to its strength-to-weight ratio.
Correct Answer: B — Structural components
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Q. What is the main use of citric acid?
A.
Preservative
B.
Flavoring agent
C.
Cleaning agent
D.
All of the above
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Solution
Citric acid is used as a preservative, flavoring agent, and cleaning agent.
Correct Answer: D — All of the above
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Q. What is the main use of hydrogen in the Haber process?
A.
To produce ammonia
B.
To produce water
C.
To produce hydrogen peroxide
D.
To produce methane
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Solution
In the Haber process, hydrogen is used to produce ammonia (NH3).
Correct Answer: A — To produce ammonia
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Q. What is the main use of polycarbonate?
A.
Insulation
B.
Optical lenses
C.
Textiles
D.
Adhesives
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Solution
Polycarbonate is primarily used in the production of optical lenses due to its clarity and strength.
Correct Answer: B — Optical lenses
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Q. What is the main use of polyvinyl chloride (PVC)?
A.
Insulation
B.
Pipes and fittings
C.
Textiles
D.
Adhesives
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Solution
Polyvinyl chloride (PVC) is primarily used in pipes and fittings due to its durability.
Correct Answer: B — Pipes and fittings
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Q. What is the main vector for malaria transmission? (2021)
A.
Housefly
B.
Mosquito
C.
Tick
D.
Flea
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Solution
Malaria is primarily transmitted by the female Anopheles mosquito.
Correct Answer: B — Mosquito
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Q. What is the main vector for the transmission of malaria? (2019)
A.
Housefly
B.
Mosquito
C.
Tick
D.
Flea
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Solution
Malaria is primarily transmitted through the bite of infected female Anopheles mosquitoes.
Correct Answer: B — Mosquito
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Q. What is the major product of the hydration of propene?
A.
Propan-1-ol
B.
Propan-2-ol
C.
Butanol
D.
Ethylene glycol
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Solution
The major product of the hydration of propene is propan-2-ol due to Markovnikov's rule.
Correct Answer: B — Propan-2-ol
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Q. What is the major product of the reaction between 1-bromo-2-methylpropane and sodium ethoxide?
A.
1-ethoxy-2-methylpropane
B.
2-ethoxy-2-methylpropane
C.
1-bromo-2-ethoxypropane
D.
2-bromo-2-methylpropane
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Solution
The reaction is an SN2 reaction leading to the formation of 1-ethoxy-2-methylpropane.
Correct Answer: B — 2-ethoxy-2-methylpropane
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Q. What is the major product of the reaction between 1-bromobutane and sodium ethoxide in ethanol?
A.
1-ethoxybutane
B.
2-ethoxybutane
C.
butane
D.
no reaction
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Solution
The reaction is an example of an SN2 reaction, where sodium ethoxide acts as a nucleophile, leading to the formation of 1-ethoxybutane.
Correct Answer: B — 2-ethoxybutane
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Q. What is the major product of the reaction between 1-bromobutane and sodium hydroxide in ethanol?
A.
1-butanol
B.
2-butanol
C.
butyl bromide
D.
butyl ether
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Solution
The reaction leads to the formation of 1-butanol through an SN2 mechanism.
Correct Answer: B — 2-butanol
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Q. What is the major product of the reaction between chlorobenzene and sodium hydroxide at high temperature?
A.
Phenol
B.
Benzene
C.
Chlorobenzene
D.
Sodium phenoxide
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Solution
The reaction of chlorobenzene with sodium hydroxide at high temperature leads to the formation of phenol through nucleophilic substitution.
Correct Answer: A — Phenol
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Q. What is the major product of the reaction of 1-bromobutane with sodium ethoxide in ethanol?
A.
1-butene
B.
2-butene
C.
butane
D.
no reaction
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Solution
The reaction proceeds via an elimination mechanism (E2) leading to the formation of 2-butene as the major product.
Correct Answer: B — 2-butene
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Q. What is the major product of the reaction of 1-bromobutane with sodium ethoxide?
A.
Butane
B.
Ethyl butyl ether
C.
1-butene
D.
2-butene
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Solution
The reaction of 1-bromobutane with sodium ethoxide leads to the formation of ethyl butyl ether through an SN2 mechanism.
Correct Answer: B — Ethyl butyl ether
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Q. What is the major product of the reaction of 1-bromobutane with sodium hydroxide in ethanol? (2019)
A.
Butanol
B.
Butene
C.
Butyl bromide
D.
Sodium bromide
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Solution
The reaction of 1-bromobutane with sodium hydroxide in ethanol leads to elimination, forming butene as the major product.
Correct Answer: B — Butene
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Q. What is the major product of the reaction of 1-butene with HBr?
A.
1-bromobutane
B.
2-bromobutane
C.
Butane
D.
Bromobenzene
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Solution
The major product of the reaction of 1-butene with HBr is 2-bromobutane due to Markovnikov's rule.
Correct Answer: B — 2-bromobutane
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Q. What is the major product of the reaction of 2-butyne with H2 in the presence of a catalyst?
A.
1-butyne
B.
butane
C.
2-butyne
D.
3-butyne
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Solution
The major product of hydrogenation of 2-butyne is butane.
Correct Answer: B — butane
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Q. What is the major product of the reaction of propene with HBr?
A.
1-Bromopropane
B.
2-Bromopropane
C.
Propyl bromide
D.
Bromopropene
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Solution
The major product of the reaction of propene with HBr is 2-bromopropane due to Markovnikov's rule.
Correct Answer: B — 2-Bromopropane
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Q. What is the major product when 1-bromobutane reacts with sodium ethoxide in ethanol?
A.
1-ethoxybutane
B.
2-ethoxybutane
C.
butane
D.
butyl ethyl ether
Show solution
Solution
The reaction is an example of an SN2 reaction, leading to the formation of 1-ethoxybutane.
Correct Answer: A — 1-ethoxybutane
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Q. What is the major product when 1-bromobutane reacts with sodium ethoxide? (2021)
A.
Butane
B.
Ethyl butyl ether
C.
1-butanol
D.
2-butanol
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Solution
The reaction of 1-bromobutane with sodium ethoxide leads to the formation of ethyl butyl ether through an SN2 mechanism.
Correct Answer: B — Ethyl butyl ether
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Q. What is the major product when 2-bromobutane is treated with KOH in ethanol?
A.
But-1-ene
B.
But-2-ene
C.
Butane
D.
No reaction
Show solution
Solution
The major product is But-2-ene due to the more stable double bond formed during elimination.
Correct Answer: B — But-2-ene
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Q. What is the major product when propene is treated with bromine?
A.
1-bromopropane
B.
2-bromopropane
C.
Bromopropane
D.
No reaction
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Solution
The major product of the reaction of propene with bromine is 2-bromopropane due to anti-addition.
Correct Answer: B — 2-bromopropane
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Q. What is the major product when propene reacts with HBr?
A.
1-Bromopropane
B.
2-Bromopropane
C.
Propyl bromide
D.
Bromopropene
Show solution
Solution
The major product of the reaction of propene with HBr is 2-Bromopropane due to Markovnikov's rule.
Correct Answer: B — 2-Bromopropane
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Q. What is the majority charge carrier in a P-type semiconductor?
A.
Electrons
B.
Holes
C.
Neutrons
D.
Protons
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Solution
In a P-type semiconductor, holes are the majority charge carriers.
Correct Answer: B — Holes
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Q. What is the male gamete in flowering plants called? (2020)
A.
Ovule
B.
Pollen
C.
Style
D.
Stigma
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Solution
The male gamete in flowering plants is called pollen, which is produced in the anthers of the stamen.
Correct Answer: B — Pollen
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Q. What is the male reproductive part of a flower called? (2020)
A.
Stigma
B.
Anther
C.
Ovary
D.
Style
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Solution
The male reproductive part of a flower is called the stamen, which consists of the anther and filament. The anther is the part that produces pollen.
Correct Answer: B — Anther
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Q. What is the mass defect in a nucleus?
A.
The difference between the mass of the nucleus and the sum of the masses of its nucleons
B.
The mass of the nucleus itself
C.
The mass of the electrons surrounding the nucleus
D.
The mass of the binding energy
Show solution
Solution
The mass defect is the difference between the mass of the nucleus and the sum of the masses of its individual nucleons.
Correct Answer: A — The difference between the mass of the nucleus and the sum of the masses of its nucleons
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Q. What is the mass defect of a nucleus? (2019)
A.
The difference between the mass of the nucleus and the sum of the masses of its individual nucleons
B.
The mass of the nucleus itself
C.
The mass of the electrons surrounding the nucleus
D.
The mass of the nucleus in a different state
Show solution
Solution
The mass defect is the difference between the mass of the nucleus and the sum of the masses of its individual nucleons, which accounts for the binding energy.
Correct Answer: A — The difference between the mass of the nucleus and the sum of the masses of its individual nucleons
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Q. What is the mass of 0.25 moles of glucose (C6H12O6)? (Molar mass = 180 g/mol)
A.
45 g
B.
90 g
C.
60 g
D.
75 g
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Solution
Mass = moles × molar mass = 0.25 moles × 180 g/mol = 45 g.
Correct Answer: B — 90 g
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