Q. Which of the following statements about alcohols is correct? (2022)
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A.
They are all soluble in water.
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B.
They have higher boiling points than alkanes.
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C.
They cannot form hydrogen bonds.
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D.
They are all volatile.
Solution
Alcohols have higher boiling points than alkanes due to the presence of hydrogen bonding.
Correct Answer: B — They have higher boiling points than alkanes.
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Q. Which of the following statements about alcohols is incorrect? (2022)
-
A.
They can form hydrogen bonds.
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B.
They are generally soluble in water.
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C.
They have higher boiling points than alkanes.
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D.
All alcohols are volatile.
Solution
Not all alcohols are volatile; for example, long-chain alcohols have lower volatility.
Correct Answer: D — All alcohols are volatile.
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Q. Which of the following statements about chemisorption is true? (2022)
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A.
It is a reversible process
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B.
It involves the formation of strong chemical bonds
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C.
It occurs at low temperatures
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D.
It is independent of the nature of the adsorbate
Solution
Chemisorption involves the formation of strong chemical bonds between the adsorbate and the surface, making it generally irreversible.
Correct Answer: B — It involves the formation of strong chemical bonds
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Q. Which of the following statements about hydrogen is incorrect? (2019)
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A.
Hydrogen is the lightest element.
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B.
Hydrogen can form covalent bonds.
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C.
Hydrogen exists as a diatomic molecule in nature.
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D.
Hydrogen is a metal at room temperature.
Solution
Hydrogen is a non-metal at room temperature and does not exhibit metallic properties.
Correct Answer: D — Hydrogen is a metal at room temperature.
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Q. Which of the following statements about solutions is true? (2023)
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A.
Solutes increase the boiling point of solvents
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B.
Solutes decrease the freezing point of solvents
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C.
Both A and B
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D.
Neither A nor B
Solution
Both statements are true; solutes affect the colligative properties of solvents.
Correct Answer: C — Both A and B
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Q. Which of the following statements is true about a galvanic cell? (2020)
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A.
It converts chemical energy to electrical energy
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B.
It requires an external power source
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C.
It is always non-spontaneous
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D.
It operates at constant temperature only
Solution
A galvanic cell converts chemical energy into electrical energy spontaneously.
Correct Answer: A — It converts chemical energy to electrical energy
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Q. Which of the following statements is true about alkali metals? (2023)
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A.
They are good conductors of electricity
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B.
They have high ionization energies
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C.
They are found in nature in free state
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D.
They form acidic oxides
Solution
Alkali metals are good conductors of electricity due to the presence of free-moving electrons.
Correct Answer: A — They are good conductors of electricity
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Q. Which of the following statements is true about alkenes? (2019)
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A.
They contain at least one double bond
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B.
They are saturated hydrocarbons
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C.
They have a general formula of C_nH_(2n+2)
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D.
They cannot undergo addition reactions
Solution
Alkenes are characterized by the presence of at least one double bond between carbon atoms.
Correct Answer: A — They contain at least one double bond
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Q. Which of the following statements is true about aromatic compounds? (2022)
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A.
They are always saturated
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B.
They contain a benzene ring
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C.
They are non-polar
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D.
They do not undergo electrophilic substitution
Solution
Aromatic compounds are characterized by the presence of a benzene ring, which is a stable cyclic structure.
Correct Answer: B — They contain a benzene ring
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Q. Which of the following statements is true about exothermic reactions? (2019)
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A.
They absorb heat.
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B.
They release heat.
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C.
They require energy input.
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D.
They have a positive enthalpy change.
Solution
Exothermic reactions release heat to the surroundings, resulting in a negative enthalpy change.
Correct Answer: B — They release heat.
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Q. Which of the following statements is true about phenols? (2023)
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A.
They are stronger acids than alcohols
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B.
They do not react with bases
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C.
They are less soluble in water than alcohols
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D.
They are non-toxic
Solution
Phenols are stronger acids than alcohols due to the resonance stabilization of the phenoxide ion.
Correct Answer: A — They are stronger acids than alcohols
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Q. Which of the following statements is true for a galvanic cell? (2020)
-
A.
It converts chemical energy to electrical energy
-
B.
It requires an external power source
-
C.
It is always non-spontaneous
-
D.
It operates at constant temperature only
Solution
A galvanic cell converts chemical energy into electrical energy spontaneously.
Correct Answer: A — It converts chemical energy to electrical energy
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Q. Which of the following statements is true regarding aldehydes? (2023)
-
A.
They cannot form hydrogen bonds
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B.
They are generally more reactive than ketones
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C.
They have higher boiling points than ketones
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D.
They are less soluble in water than ketones
Solution
Aldehydes are generally more reactive than ketones due to the presence of the hydrogen atom attached to the carbonyl carbon.
Correct Answer: B — They are generally more reactive than ketones
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Q. Which of the following statements is true regarding exothermic reactions? (2021)
-
A.
They absorb heat.
-
B.
They release heat.
-
C.
They require energy input.
-
D.
They have a positive enthalpy change.
Solution
Exothermic reactions release heat, resulting in a negative enthalpy change.
Correct Answer: B — They release heat.
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Q. Which of the following statements is true regarding ideal gases? (2023)
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A.
They have no volume
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B.
They attract each other
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C.
They occupy no space
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D.
They have mass
Solution
Ideal gases are considered to have no volume and no intermolecular forces.
Correct Answer: A — They have no volume
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Q. Which of the following statements is true regarding the Arrhenius equation? (2023)
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A.
It relates temperature to the rate constant
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B.
It is only applicable to zero-order reactions
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C.
It does not include activation energy
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D.
It is a linear equation
Solution
The Arrhenius equation relates temperature to the rate constant and includes activation energy.
Correct Answer: A — It relates temperature to the rate constant
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Q. Which of the following statements is true regarding the boiling points of aldehydes and ketones? (2023)
-
A.
Aldehydes have higher boiling points than ketones
-
B.
Ketones have higher boiling points than aldehydes
-
C.
Both have the same boiling points
-
D.
None of the above
Solution
Ketones generally have higher boiling points than aldehydes due to stronger dipole-dipole interactions.
Correct Answer: B — Ketones have higher boiling points than aldehydes
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Q. Which of the following statements is true regarding the complex [Ag(NH3)2]+? (2023)
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A.
It is a tetrahedral complex.
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B.
It is a square planar complex.
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C.
It is a linear complex.
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D.
It is an octahedral complex.
Solution
[Ag(NH3)2]+ is a linear complex because silver (Ag) has a coordination number of 2 with two bidentate ligands.
Correct Answer: C — It is a linear complex.
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Q. Which of the following statements is true regarding the complex [Cr(NH3)6]3+? (2023)
-
A.
It is tetrahedral
-
B.
It is octahedral
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C.
It is square planar
-
D.
It has a coordination number of 4
Solution
The complex [Cr(NH3)6]3+ is octahedral with a coordination number of 6, as it is surrounded by six ammonia ligands.
Correct Answer: B — It is octahedral
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Q. Which of the following statements is true regarding the equilibrium constant? (2020)
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A.
Kc is temperature dependent
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B.
Kc is pressure dependent
-
C.
Kc is concentration dependent
-
D.
Kc is independent of temperature
Solution
The equilibrium constant Kc is dependent on temperature; changing the temperature will change the value of Kc.
Correct Answer: A — Kc is temperature dependent
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Q. Which of the following states of matter has the weakest intermolecular forces? (2023)
-
A.
Solid
-
B.
Liquid
-
C.
Gas
-
D.
Plasma
Solution
Gases have the weakest intermolecular forces, allowing particles to move freely.
Correct Answer: C — Gas
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Q. Which of the following structures has the highest packing efficiency? (2019)
-
A.
Simple cubic
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B.
Body-centered cubic
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C.
Face-centered cubic
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D.
Hexagonal close-packed
Solution
The face-centered cubic (FCC) structure has the highest packing efficiency of approximately 74%.
Correct Answer: C — Face-centered cubic
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Q. Which of the following types of solids has the highest melting point? (2019)
-
A.
Ionic solids
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B.
Covalent network solids
-
C.
Molecular solids
-
D.
Metallic solids
Solution
Covalent network solids, such as diamond, have the highest melting points due to the strong covalent bonds throughout the structure.
Correct Answer: B — Covalent network solids
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Q. Which phase change occurs at the boiling point of a substance? (2022)
-
A.
Melting
-
B.
Sublimation
-
C.
Condensation
-
D.
Vaporization
Solution
Vaporization occurs at the boiling point when a liquid turns into gas.
Correct Answer: D — Vaporization
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Q. Which polymer is commonly used in the production of fibers for clothing? (2020)
-
A.
Polyethylene
-
B.
Nylon
-
C.
Polystyrene
-
D.
Polyvinyl acetate
Solution
Nylon is commonly used in the production of fibers for clothing due to its strength and elasticity.
Correct Answer: B — Nylon
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Q. Which polymer is commonly used in the production of non-stick cookware? (2023)
-
A.
Polyethylene
-
B.
Polytetrafluoroethylene (PTFE)
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C.
Polypropylene
-
D.
Polyvinyl chloride (PVC)
Solution
Polytetrafluoroethylene (PTFE), commonly known as Teflon, is used in non-stick cookware due to its low friction properties.
Correct Answer: B — Polytetrafluoroethylene (PTFE)
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Q. Which polymer is commonly used in the production of synthetic fibers? (2023)
-
A.
Polyethylene
-
B.
Nylon
-
C.
Polystyrene
-
D.
Polyvinyl acetate
Solution
Nylon is a synthetic polymer widely used in the production of synthetic fibers for clothing and textiles.
Correct Answer: B — Nylon
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Q. Which quantum number is not required to describe the electron in an atom? (2019)
-
A.
Principal quantum number
-
B.
Azimuthal quantum number
-
C.
Magnetic quantum number
-
D.
Color quantum number
Solution
Color quantum number is not a valid quantum number for describing electrons in an atom.
Correct Answer: D — Color quantum number
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Q. Which reaction is characteristic of carboxylic acids? (2021)
-
A.
Esterification
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B.
Hydrogenation
-
C.
Halogenation
-
D.
Dehydration
Solution
Esterification is a characteristic reaction of carboxylic acids, where they react with alcohols to form esters.
Correct Answer: A — Esterification
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Q. Which reaction is used to prepare carboxylic acids from alcohols? (2020)
-
A.
Oxidation
-
B.
Reduction
-
C.
Hydrolysis
-
D.
Dehydration
Solution
Oxidation of alcohols leads to the formation of carboxylic acids.
Correct Answer: A — Oxidation
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