Q. What type of reaction occurs when 1-bromopropane reacts with sodium ethoxide? (2023)
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A.
Elimination
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B.
Nucleophilic substitution
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C.
Addition
-
D.
Oxidation
Solution
The reaction of 1-bromopropane with sodium ethoxide is a nucleophilic substitution reaction where the ethoxide ion replaces the bromine atom.
Correct Answer: B — Nucleophilic substitution
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Q. What type of reaction occurs when 1-chlorobutane is treated with aqueous KOH? (2023)
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A.
Elimination
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B.
Substitution
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C.
Addition
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D.
Redox
Solution
When 1-chlorobutane is treated with aqueous KOH, a nucleophilic substitution reaction occurs, resulting in the formation of butanol.
Correct Answer: B — Substitution
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Q. What type of reaction occurs when 1-chloropropane reacts with aqueous KOH? (2023)
-
A.
Elimination
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B.
Substitution
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C.
Addition
-
D.
Redox
Solution
The reaction of 1-chloropropane with aqueous KOH leads to an elimination reaction, forming propene.
Correct Answer: B — Substitution
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Q. What type of reaction occurs when 1-chloropropane reacts with potassium cyanide? (2019)
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A.
Nucleophilic substitution
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B.
Electrophilic substitution
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C.
Addition reaction
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D.
Elimination reaction
Solution
The reaction between 1-chloropropane and potassium cyanide is a nucleophilic substitution reaction, resulting in the formation of propanenitrile.
Correct Answer: A — Nucleophilic substitution
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Q. What type of reaction occurs when 1-chloropropane reacts with sodium cyanide? (2023)
-
A.
Elimination
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B.
Nucleophilic substitution
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C.
Addition
-
D.
Redox
Solution
The reaction between 1-chloropropane and sodium cyanide is a nucleophilic substitution reaction where the cyanide ion replaces the chlorine atom.
Correct Answer: B — Nucleophilic substitution
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Q. What type of reaction occurs when 1-chloropropane reacts with sodium iodide in acetone? (2023)
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A.
Elimination
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B.
Nucleophilic substitution
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C.
Addition
-
D.
Redox
Solution
The reaction is a nucleophilic substitution (S_N2) where iodide ion replaces the chlorine atom.
Correct Answer: B — Nucleophilic substitution
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Q. What type of reaction occurs when 2-bromopropane is treated with aqueous KOH? (2023)
-
A.
Elimination
-
B.
Substitution
-
C.
Addition
-
D.
Redox
Solution
The reaction of 2-bromopropane with aqueous KOH leads to an elimination reaction, forming propene.
Correct Answer: A — Elimination
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Q. What type of reaction occurs when an alcohol is oxidized? (2023)
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A.
Reduction
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B.
Dehydration
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C.
Substitution
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D.
Oxidation
Solution
Oxidation of alcohols involves the loss of hydrogen or the gain of oxygen, leading to the formation of aldehydes, ketones, or carboxylic acids.
Correct Answer: D — Oxidation
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Q. What type of reaction occurs when chlorobenzene is treated with magnesium in dry ether? (2019)
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A.
Grignard reaction
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B.
Nucleophilic substitution
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C.
Electrophilic substitution
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D.
Reduction reaction
Solution
The reaction of chlorobenzene with magnesium in dry ether forms a Grignard reagent, which is a key step in organic synthesis.
Correct Answer: A — Grignard reaction
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Q. What type of reaction occurs when phenol reacts with bromine? (2023)
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A.
Electrophilic substitution
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B.
Nucleophilic substitution
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C.
Addition
-
D.
Elimination
Solution
Phenol undergoes electrophilic substitution when it reacts with bromine, resulting in brominated phenols.
Correct Answer: A — Electrophilic substitution
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Q. What type of reproduction is primarily observed in bryophytes? (2020)
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A.
Asexual reproduction
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B.
Sexual reproduction
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C.
Both asexual and sexual reproduction
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D.
Vegetative reproduction
Solution
Bryophytes can reproduce both sexually, through gametes, and asexually, through fragmentation or budding.
Correct Answer: C — Both asexual and sexual reproduction
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Q. What type of reproduction is primarily observed in ferns? (2020)
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A.
Asexual reproduction
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B.
Sexual reproduction
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C.
Vegetative reproduction
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D.
All of the above
Solution
Ferns primarily reproduce sexually through spores, although they can also reproduce asexually.
Correct Answer: B — Sexual reproduction
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Q. What type of reproduction is primarily observed in flowering plants? (2022)
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A.
Asexual reproduction
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B.
Vegetative propagation
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C.
Sexual reproduction
-
D.
Budding
Solution
Flowering plants primarily reproduce sexually through the formation of flowers and seeds.
Correct Answer: C — Sexual reproduction
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Q. What type of reproduction is primarily seen in algae? (2019)
-
A.
Asexual reproduction
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B.
Sexual reproduction
-
C.
Both asexual and sexual reproduction
-
D.
Vegetative reproduction
Solution
Algae can reproduce both asexually and sexually, depending on environmental conditions.
Correct Answer: C — Both asexual and sexual reproduction
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Q. What type of reproduction is primarily seen in ferns? (2021)
-
A.
Asexual reproduction
-
B.
Sexual reproduction
-
C.
Both asexual and sexual reproduction
-
D.
Vegetative reproduction
Solution
Ferns primarily reproduce sexually through spores, although they can also reproduce asexually.
Correct Answer: B — Sexual reproduction
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Q. What type of reproduction occurs in flowering plants? (2021)
-
A.
Asexual reproduction
-
B.
Sexual reproduction
-
C.
Both asexual and sexual
-
D.
None of the above
Solution
Flowering plants can reproduce both sexually (through seeds) and asexually (through vegetative propagation).
Correct Answer: C — Both asexual and sexual
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Q. What type of reproduction occurs in hydra? (2023)
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A.
Budding
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B.
Binary fission
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C.
Fragmentation
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D.
Sexual reproduction
Solution
Hydra reproduces asexually by budding, where a new individual develops from an outgrowth of the parent.
Correct Answer: A — Budding
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Q. What type of reproduction occurs in sponges? (2020)
-
A.
Asexual reproduction only
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B.
Sexual reproduction only
-
C.
Both asexual and sexual reproduction
-
D.
None of the above
Solution
Sponges can reproduce both asexually through budding and sexually by producing gametes.
Correct Answer: C — Both asexual and sexual reproduction
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Q. What type of root system is found in monocots? (2021)
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A.
Tap root system
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B.
Fibrous root system
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C.
Adventitious root system
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D.
None of the above
Solution
Monocots typically have a fibrous root system, which consists of many thin roots.
Correct Answer: B — Fibrous root system
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Q. What type of semiconductor is formed by adding trivalent impurities? (2023)
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A.
N-type
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B.
P-type
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C.
Intrinsic
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D.
Superconductor
Solution
Adding trivalent impurities (like boron) to a semiconductor creates a p-type semiconductor.
Correct Answer: B — P-type
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Q. What type of solid is diamond classified as? (2022)
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A.
Metallic solid
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B.
Ionic solid
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C.
Covalent network solid
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D.
Molecular solid
Solution
Diamond is classified as a covalent network solid due to its strong covalent bonds forming a three-dimensional network.
Correct Answer: C — Covalent network solid
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Q. What type of symmetry do most animals in the phylum Cnidaria exhibit? (2023)
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A.
Bilateral symmetry
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B.
Radial symmetry
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C.
Asymmetry
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D.
Spherical symmetry
Solution
Most cnidarians exhibit radial symmetry, allowing them to interact with their environment from all directions.
Correct Answer: B — Radial symmetry
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Q. What type of symmetry do most animals in the phylum Porifera exhibit? (2019)
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A.
Bilateral symmetry
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B.
Radial symmetry
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C.
Asymmetry
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D.
Spherical symmetry
Solution
Most animals in the phylum Porifera, such as sponges, exhibit asymmetry.
Correct Answer: C — Asymmetry
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Q. What type of symmetry is exhibited by organisms in the phylum Cnidaria? (2019)
-
A.
Bilateral symmetry
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B.
Radial symmetry
-
C.
Asymmetry
-
D.
Spherical symmetry
Solution
Organisms in the phylum Cnidaria, such as jellyfish and corals, exhibit radial symmetry.
Correct Answer: B — Radial symmetry
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Q. What type of symmetry is exhibited by organisms in the phylum Platyhelminthes? (2022)
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A.
Bilateral symmetry
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B.
Radial symmetry
-
C.
Asymmetry
-
D.
Spherical symmetry
Solution
Platyhelminthes, or flatworms, exhibit bilateral symmetry, which is a key characteristic of this phylum.
Correct Answer: A — Bilateral symmetry
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Q. What type of symmetry is exhibited by organisms in the phylum Porifera? (2021)
-
A.
Bilateral symmetry
-
B.
Radial symmetry
-
C.
Asymmetry
-
D.
Spherical symmetry
Solution
Organisms in the phylum Porifera, such as sponges, exhibit asymmetry.
Correct Answer: C — Asymmetry
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Q. What type of tissue is responsible for the transport of water in plants? (2019)
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A.
Phloem
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B.
Xylem
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C.
Parenchyma
-
D.
Collenchyma
Solution
Xylem is the type of tissue responsible for the transport of water and minerals from the roots to the rest of the plant.
Correct Answer: B — Xylem
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Q. What type of wave is characterized by particle motion being parallel to wave motion? (2023)
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A.
Transverse wave
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B.
Longitudinal wave
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C.
Surface wave
-
D.
Standing wave
Solution
In a longitudinal wave, the particle motion is parallel to the direction of wave propagation.
Correct Answer: B — Longitudinal wave
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Q. What type of wave is produced when a vibrating tuning fork is placed on a table? (2022)
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A.
Transverse wave
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B.
Longitudinal wave
-
C.
Surface wave
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D.
Electromagnetic wave
Solution
A vibrating tuning fork produces longitudinal waves in the air, which then can create transverse waves in the surface of the table.
Correct Answer: B — Longitudinal wave
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Q. Which alkali metal is known for its vigorous reaction with water? (2022)
-
A.
Lithium
-
B.
Sodium
-
C.
Potassium
-
D.
Rubidium
Solution
Potassium (K) reacts vigorously with water, producing potassium hydroxide and hydrogen gas.
Correct Answer: C — Potassium
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