JEE Main
Q. Which of the following sets of quantum numbers is not allowed?
A.
n=2, l=1, m_l=0
B.
n=3, l=2, m_l=2
C.
n=1, l=0, m_l=1
D.
n=4, l=3, m_l=-3
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Solution
For l=0, m_l can only be 0. Therefore, n=1, l=0, m_l=1 is not allowed.
Correct Answer: C — n=1, l=0, m_l=1
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Q. Which of the following sets of quantum numbers is not possible?
A.
n=3, l=2, m_l=1
B.
n=2, l=1, m_l=2
C.
n=4, l=3, m_l=0
D.
n=1, l=0, m_l=0
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Solution
For l=1, m_l can only be -1, 0, or +1. Therefore, m_l=2 is not possible.
Correct Answer: B — n=2, l=1, m_l=2
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Q. Which of the following shapes has the largest moment of inertia for the same mass and radius?
A.
Solid sphere
B.
Hollow sphere
C.
Solid cylinder
D.
Hollow cylinder
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Solution
The hollow sphere has the largest moment of inertia compared to the other shapes for the same mass and radius.
Correct Answer: B — Hollow sphere
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Q. Which of the following solutions has the highest boiling point?
A.
0.1 M NaCl
B.
0.1 M KCl
C.
0.1 M CaCl2
D.
0.1 M glucose
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Solution
CaCl2 dissociates into 3 ions (Ca^2+ and 2 Cl^-), leading to the highest boiling point elevation among the options.
Correct Answer: C — 0.1 M CaCl2
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Q. Which of the following solutions will have the highest boiling point?
A.
0.1 M NaCl
B.
0.1 M KCl
C.
0.1 M glucose
D.
0.1 M MgCl2
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Solution
0.1 M MgCl2 will have the highest boiling point due to the highest van 't Hoff factor (i = 3).
Correct Answer: D — 0.1 M MgCl2
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Q. Which of the following solutions will have the lowest freezing point?
A.
0.1 M NaCl
B.
0.1 M KBr
C.
0.1 M MgCl2
D.
0.1 M glucose
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Solution
MgCl2 dissociates into 3 ions, leading to the greatest freezing point depression among the options.
Correct Answer: C — 0.1 M MgCl2
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Q. Which of the following solutions will have the lowest vapor pressure?
A.
0.1 M NaCl
B.
0.1 M KBr
C.
0.1 M MgCl2
D.
0.1 M glucose
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Solution
MgCl2 dissociates into 3 ions, leading to the highest number of solute particles and thus the lowest vapor pressure.
Correct Answer: C — 0.1 M MgCl2
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Q. Which of the following species exhibits sp3d hybridization?
A.
SF4
B.
XeF2
C.
NH3
D.
C2H4
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Solution
In SF4, the sulfur atom is sp3d hybridized, resulting in a seesaw molecular geometry.
Correct Answer: A — SF4
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Q. Which of the following species has a bond order of 1?
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Solution
F2 has a bond order of 1, calculated as (8 bonding electrons - 6 antibonding electrons)/2 = 1.
Correct Answer: C — F2
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Q. Which of the following species has a central atom with sp3 hybridization?
A.
CCl4
B.
CO2
C.
BF3
D.
H2O
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Solution
In CCl4, the central carbon atom is sp3 hybridized, forming a tetrahedral geometry.
Correct Answer: A — CCl4
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Q. Which of the following species has a linear geometry due to hybridization?
A.
H2O
B.
CO2
C.
NH3
D.
CH4
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Solution
CO2 has a linear geometry due to the sp hybridization of the carbon atom.
Correct Answer: B — CO2
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Q. Which of the following species has a linear molecular geometry?
A.
BeCl2
B.
NH3
C.
H2O
D.
CH3Cl
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Solution
BeCl2 has two bonding pairs and no lone pairs, resulting in a linear molecular geometry.
Correct Answer: A — BeCl2
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Q. Which of the following species has a linear molecular shape?
A.
BeCl2
B.
SF6
C.
NH3
D.
H2O
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Solution
BeCl2 has two bonding pairs and no lone pairs, resulting in a linear shape.
Correct Answer: A — BeCl2
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Q. Which of the following species has a tetrahedral shape?
A.
CH4
B.
C2H4
C.
NH3
D.
H2O
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Solution
CH4 has a tetrahedral shape due to sp3 hybridization of the carbon atom.
Correct Answer: A — CH4
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Q. Which of the following species has a trigonal bipyramidal geometry?
A.
PCl5
B.
BF3
C.
H2O
D.
NH4+
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Solution
PCl5 has five bonding pairs and no lone pairs, resulting in a trigonal bipyramidal geometry.
Correct Answer: A — PCl5
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Q. Which of the following species has sp2 hybridization?
A.
C2H2
B.
BF3
C.
C2H4
D.
CH4
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Solution
C2H4 (ethylene) has a carbon-carbon double bond, and each carbon is sp2 hybridized.
Correct Answer: C — C2H4
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Q. Which of the following species has the highest bond order?
A.
O2+
B.
O2
C.
O2-
D.
O2 2-
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Solution
O2+ has a bond order of 2.5, which is higher than O2 (2), O2- (1.5), and O2 2- (1).
Correct Answer: A — O2+
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Q. Which of the following species is reduced in the reaction 2MnO4- + 5C2O4^2- + 16H+ → 2Mn^2+ + 10CO2 + 8H2O?
A.
MnO4-
B.
C2O4^2-
C.
H+
D.
CO2
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Solution
In the given reaction, MnO4- is reduced to Mn^2+.
Correct Answer: A — MnO4-
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Q. Which of the following statements about a convex lens is true?
A.
It can only produce real images.
B.
It can only produce virtual images.
C.
It can produce both real and virtual images.
D.
It has a negative focal length.
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Solution
A convex lens can produce both real images (when the object is outside the focal length) and virtual images (when the object is within the focal length).
Correct Answer: C — It can produce both real and virtual images.
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Q. Which of the following statements about a potentiometer is true?
A.
It can only measure AC voltages.
B.
It requires a constant current for accurate measurements.
C.
It can measure both AC and DC voltages.
D.
It is only used in laboratory settings.
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Solution
A potentiometer requires a constant current to ensure accurate measurements of voltage.
Correct Answer: B — It requires a constant current for accurate measurements.
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Q. Which of the following statements about alcohols is true?
A.
They are always soluble in water.
B.
They have higher boiling points than alkanes.
C.
They cannot form hydrogen bonds.
D.
They are less dense than water.
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Solution
Alcohols have higher boiling points than alkanes due to hydrogen bonding.
Correct Answer: B — They have higher boiling points than alkanes.
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Q. Which of the following statements about alkanes is true?
A.
They are highly reactive.
B.
They are saturated hydrocarbons.
C.
They contain double bonds.
D.
They are polar molecules.
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Solution
Alkanes are saturated hydrocarbons, meaning they contain only single bonds between carbon atoms.
Correct Answer: B — They are saturated hydrocarbons.
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Q. Which of the following statements about alkenes is true?
A.
They are saturated hydrocarbons.
B.
They can undergo polymerization.
C.
They do not react with electrophiles.
D.
They have a higher boiling point than alkanes.
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Solution
Alkenes can undergo polymerization due to the presence of a double bond.
Correct Answer: B — They can undergo polymerization.
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Q. Which of the following statements about alkynes is incorrect?
A.
They are unsaturated hydrocarbons.
B.
They contain at least one triple bond.
C.
They are more reactive than alkenes.
D.
They have a higher boiling point than alkenes.
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Solution
Alkynes are generally less reactive than alkenes due to the stability of the triple bond.
Correct Answer: C — They are more reactive than alkenes.
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Q. Which of the following statements about alkynes is true?
A.
They are less acidic than alkenes.
B.
They can undergo polymerization.
C.
They have a higher boiling point than alkenes.
D.
They are more stable than alkenes.
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Solution
Alkynes have a higher boiling point than alkenes due to stronger intermolecular forces.
Correct Answer: C — They have a higher boiling point than alkenes.
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Q. Which of the following statements about amines is incorrect?
A.
Amines are basic in nature.
B.
Amines can form salts with acids.
C.
Amines have higher boiling points than alcohols.
D.
Amines can act as nucleophiles.
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Solution
Amines generally have lower boiling points than alcohols due to the absence of hydrogen bonding in tertiary amines.
Correct Answer: C — Amines have higher boiling points than alcohols.
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Q. Which of the following statements about aromatic amines is true?
A.
They are more basic than aliphatic amines
B.
They are less basic than aliphatic amines
C.
They do not react with acids
D.
They are neutral compounds
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Solution
Aromatic amines are less basic than aliphatic amines due to resonance stabilization of the lone pair on nitrogen.
Correct Answer: B — They are less basic than aliphatic amines
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Q. Which of the following statements about aromatic compounds is true?
A.
They are always colorless
B.
They have a sweet smell
C.
They are non-toxic
D.
They can be carcinogenic
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Solution
Many aromatic compounds can be carcinogenic, such as benzene, which is known to be harmful to human health.
Correct Answer: D — They can be carcinogenic
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Q. Which of the following statements about buoyancy is true?
A.
Buoyant force acts downward
B.
Buoyant force is equal to the weight of the fluid displaced
C.
Buoyant force depends on the shape of the object
D.
Buoyant force is always equal to the weight of the object
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Solution
The buoyant force acting on an object submerged in a fluid is equal to the weight of the fluid displaced by the object.
Correct Answer: B — Buoyant force is equal to the weight of the fluid displaced
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Q. Which of the following statements about carboxylic acids is true?
A.
They are always soluble in water
B.
They have higher boiling points than alcohols
C.
They can form hydrogen bonds
D.
All of the above
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Solution
Carboxylic acids can form hydrogen bonds due to the presence of the -COOH group, which contributes to their higher boiling points compared to hydrocarbons.
Correct Answer: C — They can form hydrogen bonds
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