Q. Which of the following statements is true about adsorption? (2023)
A.
It is a bulk phenomenon
B.
It is a surface phenomenon
C.
It occurs only in gases
D.
It is always exothermic
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Solution
Adsorption is a surface phenomenon as it occurs at the interface between phases.
Correct Answer: B — It is a surface phenomenon
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Q. Which of the following statements is true about coordination compounds? (2021) 2021
A.
They are always ionic
B.
They can exhibit optical isomerism
C.
They have fixed oxidation states
D.
They cannot form complexes
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Solution
Coordination compounds can exhibit optical isomerism due to the arrangement of ligands around the central metal ion.
Correct Answer: B — They can exhibit optical isomerism
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Q. Which of the following statements is true about galvanic cells? (2020)
A.
They convert chemical energy to electrical energy
B.
They require an external power source
C.
They operate only in acidic solutions
D.
They are always non-spontaneous
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Solution
Galvanic cells convert chemical energy into electrical energy spontaneously.
Correct Answer: A — They convert chemical energy to electrical energy
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Q. Which of the following statements is true about the image formed by a convex lens? (2021)
A.
Always real
B.
Always virtual
C.
Can be real or virtual
D.
Always inverted
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Solution
A convex lens can form both real and virtual images depending on the position of the object relative to the focal point.
Correct Answer: C — Can be real or virtual
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Q. Which of the following statements is true about the law of conservation of energy?
A.
Energy can be created
B.
Energy can be destroyed
C.
Energy can be transformed
D.
Energy is always lost
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Solution
The law of conservation of energy states that energy cannot be created or destroyed, but it can be transformed from one form to another.
Correct Answer: C — Energy can be transformed
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Q. Which of the following statements is true about the nucleus of an atom? (2019)
A.
It contains only protons
B.
It contains only neutrons
C.
It contains protons and neutrons
D.
It contains electrons
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Solution
The nucleus of an atom contains protons and neutrons, which are collectively known as nucleons.
Correct Answer: C — It contains protons and neutrons
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Q. Which of the following statements is true for an adiabatic process? (2022) 2022
A.
Heat is exchanged with the surroundings
B.
Work done is zero
C.
Temperature changes
D.
Pressure remains constant
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Solution
In an adiabatic process, there is no heat exchange with the surroundings, and the temperature of the system changes due to work done on or by the system.
Correct Answer: C — Temperature changes
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Q. Which of the following statements is true for an isochoric process? (2023)
A.
Volume remains constant
B.
Pressure remains constant
C.
Temperature remains constant
D.
Heat is absorbed
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Solution
In an isochoric process, the volume of the system remains constant.
Correct Answer: A — Volume remains constant
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Q. Which of the following statements is true for the complex [Fe(CN)6]3-? (2023)
A.
It is a high-spin complex
B.
It is a low-spin complex
C.
It has a coordination number of 4
D.
It is paramagnetic
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Solution
The complex [Fe(CN)6]3- is a low-spin complex due to the strong field nature of CN- ligands, resulting in paired electrons.
Correct Answer: B — It is a low-spin complex
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Q. Which of the following statements is true regarding a buffer solution? (2020)
A.
It resists changes in pH
B.
It has a pH of 7
C.
It can only be made from strong acids
D.
It cannot be made from weak acids
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Solution
A buffer solution is designed to resist changes in pH upon the addition of small amounts of acid or base.
Correct Answer: A — It resists changes in pH
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Q. Which of the following statements is true regarding adsorption isotherms? (2020)
A.
They describe the relationship between pressure and volume.
B.
They describe the relationship between temperature and solubility.
C.
They describe the relationship between the amount of adsorbate and its pressure at constant temperature.
D.
They describe the relationship between the surface area and the mass of adsorbent.
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Solution
Adsorption isotherms describe the relationship between the amount of adsorbate on the adsorbent and its pressure at a constant temperature, illustrating how adsorption varies with pressure.
Correct Answer: C — They describe the relationship between the amount of adsorbate and its pressure at constant temperature.
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Q. Which of the following statements is true regarding gravitational fields? (2022)
A.
Gravitational fields are always attractive
B.
Gravitational fields can be repulsive
C.
Gravitational fields are independent of mass
D.
Gravitational fields do not exist in space
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Solution
Gravitational fields are always attractive, pulling masses towards each other.
Correct Answer: A — Gravitational fields are always attractive
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Q. Which of the following statements is true regarding reduction? (2020)
A.
It involves the gain of electrons
B.
It involves the loss of electrons
C.
It always occurs with oxidation
D.
Both A and C are correct
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Solution
Reduction is defined as the gain of electrons, and it always occurs simultaneously with oxidation in redox reactions.
Correct Answer: D — Both A and C are correct
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Q. Which of the following statements is true regarding the Freundlich adsorption isotherm? (2020)
A.
It applies only to monolayer adsorption.
B.
It is applicable to heterogeneous surfaces.
C.
It predicts a constant adsorption capacity.
D.
It is a linear relationship.
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Solution
The Freundlich adsorption isotherm is applicable to heterogeneous surfaces and describes how adsorption varies with pressure or concentration, indicating that it is not limited to monolayer adsorption.
Correct Answer: B — It is applicable to heterogeneous surfaces.
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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 statements is true regarding the uncertainty principle? (2023)
A.
It applies only to macroscopic objects
B.
It states that position and momentum cannot be known simultaneously
C.
It is only applicable in classical mechanics
D.
It has no practical implications
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Solution
The uncertainty principle states that position and momentum cannot be precisely known at the same time.
Correct Answer: B — It states that position and momentum cannot be known simultaneously
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Q. Which of the following statements is true regarding thermal conductivity? (2023)
A.
It is higher in gases than in solids
B.
It is a measure of a material's ability to conduct heat
C.
It increases with temperature
D.
It is independent of material properties
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Solution
Thermal conductivity is a measure of a material's ability to conduct heat; it varies with material and temperature.
Correct Answer: B — It is a measure of a material's ability to conduct heat
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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 reaction is used to prepare amines from nitriles? (2020)
A.
Hydrogenation
B.
Reduction
C.
Alkylation
D.
Dehydration
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Solution
Nitriles can be converted to amines through reduction, typically using hydrogen in the presence of a catalyst.
Correct Answer: B — Reduction
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