Chemistry
Q. Which of the following statements is true regarding the Freundlich adsorption isotherm? (2020) 2020
A.
It is applicable to monolayer adsorption.
B.
It assumes a uniform surface.
C.
It is a linear relationship.
D.
It describes heterogeneous adsorption.
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Solution
The Freundlich adsorption isotherm describes heterogeneous adsorption on surfaces with varying affinities, making it suitable for real-world applications.
Correct Answer: D — It describes heterogeneous adsorption.
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Q. Which of the following states of matter has a definite shape?
A.
Solid
B.
Liquid
C.
Gas
D.
Plasma
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Solution
Solids have a definite shape due to closely packed particles that do not move freely.
Correct Answer: A — Solid
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Q. Which of the following states of matter has a definite volume but no definite shape?
A.
Solid
B.
Liquid
C.
Gas
D.
Plasma
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Solution
Liquids have a definite volume but take the shape of their container.
Correct Answer: B — Liquid
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Q. Which of the following states of matter has the highest kinetic energy? (2022)
A.
Solid
B.
Liquid
C.
Gas
D.
Plasma
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Solution
Plasma has the highest kinetic energy as it consists of ionized gases with free-moving charged particles.
Correct Answer: D — Plasma
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Q. Which of the following states of matter has the least intermolecular forces?
A.
Solid
B.
Liquid
C.
Gas
D.
All are equal
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Solution
Gases have the least intermolecular forces, allowing particles to move freely.
Correct Answer: C — Gas
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Q. Which p-block element is essential for the formation of DNA? (2023) 2023
A.
Oxygen
B.
Nitrogen
C.
Phosphorus
D.
Sulfur
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Solution
Phosphorus is essential for the formation of DNA as it is part of the backbone structure.
Correct Answer: C — Phosphorus
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Q. Which p-block element is known for its allotropes including diamond and graphite? (2020) 2020
A.
Carbon
B.
Silicon
C.
Germanium
D.
Tin
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Solution
Carbon is known for its allotropes, including diamond and graphite.
Correct Answer: A — Carbon
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Q. Which polymer is commonly used in 3D printing?
A.
PLA
B.
PVC
C.
Nylon
D.
Polyethylene
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Solution
PLA (Polylactic Acid) is a commonly used polymer in 3D printing due to its ease of use and biodegradability.
Correct Answer: A — PLA
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Q. Which polymer is known for its high resistance to heat?
A.
Polyethylene
B.
Teflon
C.
Polypropylene
D.
PVC
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Solution
Teflon (PTFE) is known for its high heat resistance and non-stick properties.
Correct Answer: B — Teflon
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Q. Which quantum number describes the orientation of an orbital? (2020) 2020
A.
Principal quantum number
B.
Azimuthal quantum number
C.
Magnetic quantum number
D.
Spin quantum number
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Solution
The magnetic quantum number describes the orientation of an orbital.
Correct Answer: C — Magnetic quantum number
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Q. Which reaction is characteristic of alcohols? (2020)
A.
Dehydration
B.
Hydrogenation
C.
Halogenation
D.
Oxidation
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Solution
Dehydration is a characteristic reaction of alcohols where they lose water to form alkenes.
Correct Answer: A — Dehydration
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Q. Which reaction is used to prepare amines from alkyl halides? (2020)
A.
Nitration
B.
Hydrogenation
C.
Nucleophilic substitution
D.
Electrophilic substitution
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Solution
Amines can be prepared from alkyl halides through nucleophilic substitution reactions where the amine acts as a nucleophile.
Correct Answer: C — Nucleophilic substitution
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Q. Which reaction is used to prepare amines from alkyl halides? (2020) 2020
A.
Hydrogenation
B.
Nucleophilic substitution
C.
Electrophilic substitution
D.
Dehydrohalogenation
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Solution
Amines can be prepared from alkyl halides through nucleophilic substitution reactions, where the halide is replaced by an amine group.
Correct Answer: B — Nucleophilic substitution
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Q. Which reagent can be used to convert an alkyl halide to an alcohol?
A.
H2O
B.
NaOH
C.
KBr
D.
HCl
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Solution
NaOH can be used to convert an alkyl halide to an alcohol through nucleophilic substitution.
Correct Answer: B — NaOH
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Q. Which reagent is commonly used to test for the presence of phenols?
A.
Bromine water
B.
Sodium dichromate
C.
Fehling's solution
D.
Tollens' reagent
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Solution
Bromine water is used to test for phenols, as they will decolorize bromine water.
Correct Answer: A — Bromine water
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Q. Which reagent is used to convert an alcohol to an alkyl halide? (2023) 2023
A.
PCl5
B.
NaOH
C.
H2SO4
D.
KMnO4
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Solution
PCl5 is commonly used to convert alcohols to alkyl halides through a substitution reaction.
Correct Answer: A — PCl5
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Q. Which state of matter has a definite shape and volume? (2017)
A.
Solid
B.
Liquid
C.
Gas
D.
Plasma
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Solution
Solids have a definite shape and volume due to their closely packed particles.
Correct Answer: A — Solid
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Q. Which state of matter has the highest kinetic energy?
A.
Solid
B.
Liquid
C.
Gas
D.
Plasma
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Solution
Plasma has the highest kinetic energy as it consists of ionized particles moving freely.
Correct Answer: D — Plasma
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Q. Which transition metal has the electron configuration [Ar] 3d6 4s2?
A.
Titanium
B.
Iron
C.
Nickel
D.
Cobalt
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Solution
Iron (Fe) has the electron configuration [Ar] 3d6 4s2.
Correct Answer: B — Iron
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Q. Which transition metal has the highest melting point?
A.
Iron
B.
Tungsten
C.
Nickel
D.
Copper
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Solution
Tungsten (W) has the highest melting point among transition metals.
Correct Answer: B — Tungsten
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Q. Which transition metal is known for forming complex ions with a coordination number of 6?
A.
Copper
B.
Nickel
C.
Cobalt
D.
Zinc
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Solution
Cobalt commonly forms complex ions with a coordination number of 6, such as in [Co(NH3)6]3+.
Correct Answer: C — Cobalt
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Q. Which transition metal is known for its catalytic properties in the Haber process?
A.
Iron
B.
Nickel
C.
Copper
D.
Cobalt
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Solution
Iron is used as a catalyst in the Haber process for ammonia synthesis.
Correct Answer: A — Iron
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Q. Which type of biomolecule is glucose?
A.
Protein
B.
Lipid
C.
Carbohydrate
D.
Nucleic Acid
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Solution
Glucose is a simple sugar and is classified as a carbohydrate.
Correct Answer: C — Carbohydrate
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