Q. Which law states that the total pressure of a gas mixture is equal to the sum of the partial pressures of its components?
A.
Dalton's Law
B.
Boyle's Law
C.
Charles's Law
D.
Avogadro's Law
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Solution
Dalton's Law states that the total pressure of a gas mixture is equal to the sum of the partial pressures of its components.
Correct Answer: A — Dalton's Law
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Q. Which level of protein structure is characterized by the arrangement of multiple polypeptide chains?
A.
Primary structure
B.
Secondary structure
C.
Tertiary structure
D.
Quaternary structure
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Solution
The quaternary structure of a protein refers to the arrangement and interaction of multiple polypeptide chains.
Correct Answer: D — Quaternary structure
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Q. Which level of protein structure is characterized by the overall 3D shape of a single polypeptide chain?
A.
Primary structure
B.
Secondary structure
C.
Tertiary structure
D.
Quaternary structure
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Solution
The tertiary structure of a protein refers to the overall 3D shape of a single polypeptide chain, determined by interactions among side chains.
Correct Answer: C — Tertiary structure
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Q. Which molecule exhibits sp hybridization?
A.
CCl4
B.
CO2
C.
NH3
D.
H2O
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Solution
In CO2, the carbon atom is sp hybridized as it forms two double bonds with oxygen.
Correct Answer: B — CO2
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Q. Which molecule has a bent shape due to lone pairs?
A.
CO2
B.
O3
C.
CH4
D.
BF3
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Solution
O3 (ozone) has a bent shape due to the presence of a lone pair on the central oxygen atom.
Correct Answer: B — O3
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Q. Which molecule has a central atom with dsp3 hybridization?
A.
SF6
B.
PCl5
C.
NH3
D.
CCl4
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Solution
PCl5 has phosphorus in the center, which is dsp3 hybridized, leading to a trigonal bipyramidal geometry.
Correct Answer: B — PCl5
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Q. Which molecule has a central atom with sp hybridization?
A.
CO2
B.
H2O
C.
NH3
D.
CCl4
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Solution
In CO2, the carbon atom is sp hybridized, forming two double bonds with oxygen.
Correct Answer: A — CO2
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Q. Which molecule has a square planar geometry?
A.
XeF4
B.
SF4
C.
ClF3
D.
NH4+
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Solution
XeF4 has four bonding pairs and two lone pairs, leading to a square planar geometry.
Correct Answer: A — XeF4
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Q. Which of the following acids is a weak acid?
A.
HCl
B.
H2SO4
C.
CH3COOH
D.
HNO3
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Solution
Acetic acid (CH3COOH) is a weak acid, while HCl, H2SO4, and HNO3 are strong acids.
Correct Answer: C — CH3COOH
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Q. Which of the following acids is stronger than acetic acid?
A.
Formic acid
B.
Propanoic acid
C.
Butanoic acid
D.
Valeric acid
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Solution
Formic acid (HCOOH) is stronger than acetic acid (CH3COOH).
Correct Answer: A — Formic acid
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Q. Which of the following acids is the strongest?
A.
Formic acid
B.
Acetic acid
C.
Propanoic acid
D.
Butanoic acid
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Solution
Formic acid (HCOOH) is stronger than acetic acid and other listed acids.
Correct Answer: A — Formic acid
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Q. Which of the following alcohols has the highest boiling point?
A.
Methanol
B.
Ethanol
C.
Propan-1-ol
D.
Butan-1-ol
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Solution
Butan-1-ol has the highest boiling point due to its longer carbon chain and stronger hydrogen bonding.
Correct Answer: D — Butan-1-ol
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Q. Which of the following alcohols is most acidic?
A.
Methanol
B.
Ethanol
C.
Isopropanol
D.
Tert-butanol
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Solution
Methanol is the most acidic among the given alcohols due to the absence of steric hindrance.
Correct Answer: A — Methanol
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Q. Which of the following alcohols is the most acidic?
A.
Methanol
B.
Ethanol
C.
Propan-1-ol
D.
Butan-1-ol
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Solution
Methanol is the most acidic among the given alcohols due to its smaller size and higher electronegativity.
Correct Answer: A — Methanol
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Q. Which of the following alkanes has a branched structure?
A.
Butane
B.
Pentane
C.
Isobutane
D.
Hexane
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Solution
Isobutane is a branched alkane.
Correct Answer: C — Isobutane
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Q. Which of the following alkanes has a higher density than water?
A.
Ethane
B.
Propane
C.
Butane
D.
Pentane
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Solution
Butane has a higher density than water.
Correct Answer: C — Butane
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Q. Which of the following alkanes has a molecular weight closest to 72 g/mol?
A.
C5H12
B.
C6H14
C.
C7H16
D.
C8H18
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Solution
C6H14 (hexane) has a molecular weight of approximately 86 g/mol, while C7H16 (heptane) has a molecular weight of approximately 100 g/mol. The closest is C6H14.
Correct Answer: B — C6H14
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Q. Which of the following alkanes has the highest boiling point?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
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Solution
Butane has the highest boiling point among the given alkanes due to its larger molecular size.
Correct Answer: D — Butane
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Q. Which of the following alkanes has the lowest density?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
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Solution
Methane has the lowest density among the given alkanes.
Correct Answer: A — Methane
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Q. Which of the following alkanes has the lowest molecular weight?
A.
Butane
B.
Propane
C.
Ethane
D.
Methane
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Solution
Methane (CH4) has the lowest molecular weight among the given alkanes.
Correct Answer: D — Methane
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Q. Which of the following alkanes is a gas at room temperature?
A.
Hexane
B.
Octane
C.
Decane
D.
Methane
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Solution
Methane is a gas at room temperature.
Correct Answer: D — Methane
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Q. Which of the following alkanes is branched?
A.
Butane
B.
Pentane
C.
Isobutane
D.
Hexane
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Solution
Isobutane is a branched alkane, while butane, pentane, and hexane are straight-chain alkanes.
Correct Answer: C — Isobutane
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Q. Which of the following alkanes is the least branched?
A.
2-Methylbutane
B.
3-Methylpentane
C.
Butane
D.
Hexane
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Solution
Butane is the least branched alkane among the options.
Correct Answer: C — Butane
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Q. Which of the following alkanes is the least soluble in water?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
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Solution
Methane is the least soluble in water due to its nonpolar nature.
Correct Answer: A — Methane
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Q. Which of the following alkenes has the highest boiling point?
A.
Ethene
B.
Propene
C.
Butene
D.
Pentene
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Solution
Pentene has the highest boiling point due to its larger molecular size and increased van der Waals forces.
Correct Answer: D — Pentene
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Q. Which of the following alkenes is most likely to undergo electrophilic addition reaction?
A.
Cyclohexene
B.
1,3-butadiene
C.
1-hexene
D.
2-methylpropene
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Solution
2-methylpropene is more reactive towards electrophilic addition due to steric hindrance being lower compared to other options.
Correct Answer: D — 2-methylpropene
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Q. Which of the following alkenes is most stable?
A.
1-Butene
B.
2-Butene
C.
Cyclohexene
D.
Propene
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Solution
2-Butene is more stable than 1-Butene due to hyperconjugation and steric hindrance.
Correct Answer: B — 2-Butene
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Q. Which of the following alkenes is the most stable?
A.
1-Butene
B.
2-Butene
C.
Cyclohexene
D.
Isobutylene
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Solution
2-Butene is more stable than 1-Butene due to hyperconjugation and steric factors.
Correct Answer: B — 2-Butene
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Q. Which of the following alkynes is symmetrical?
A.
1-butyne
B.
2-butyne
C.
1-pentyne
D.
3-pentyne
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Solution
2-butyne is a symmetrical alkyne.
Correct Answer: B — 2-butyne
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Q. Which of the following alkynes is the most acidic?
A.
Ethylene
B.
Propyne
C.
Butyne
D.
Acetylene
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Solution
Acetylene (ethyne) is the most acidic among the given alkynes due to the sp hybridization of carbon.
Correct Answer: D — Acetylene
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