Q. Which of the following amines is the most basic?
-
A.
Methylamine
-
B.
Ethylamine
-
C.
Aniline
-
D.
Dimethylamine
Solution
Dimethylamine is the most basic due to the electron-donating effect of the two methyl groups, which increases the electron density on the nitrogen.
Correct Answer: D — Dimethylamine
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Q. Which of the following amino acids contains a sulfur atom?
-
A.
Cysteine
-
B.
Serine
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C.
Glutamine
-
D.
Alanine
Solution
Cysteine is the amino acid that contains a sulfur atom in its side chain, which can form disulfide bonds.
Correct Answer: A — Cysteine
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Q. Which of the following amino acids is essential in the human diet?
-
A.
Glycine
-
B.
Alanine
-
C.
Lysine
-
D.
Serine
Solution
Lysine is an essential amino acid that must be obtained through the diet, while glycine, alanine, and serine can be synthesized by the body.
Correct Answer: C — Lysine
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Q. Which of the following assumptions is NOT part of the kinetic theory of gases?
-
A.
Gas molecules are in constant random motion
-
B.
Gas molecules have negligible volume compared to the container
-
C.
Gas molecules experience intermolecular forces
-
D.
Collisions between gas molecules are perfectly elastic
Solution
The kinetic theory of gases assumes that gas molecules do not experience intermolecular forces, which is why option 3 is NOT part of the assumptions.
Correct Answer: C — Gas molecules experience intermolecular forces
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Q. Which of the following best describes plasma?
-
A.
A solid with high density
-
B.
A gas with low density
-
C.
An ionized gas
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D.
A liquid at high temperature
Solution
Plasma is an ionized gas consisting of free electrons and ions, typically found at high temperatures.
Correct Answer: C — An ionized gas
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Q. Which of the following best describes the arrangement of particles in a gas?
-
A.
Tightly packed in a fixed position
-
B.
Close together but can move past each other
-
C.
Far apart and moving freely
-
D.
Randomly arranged in a fixed structure
Solution
Gas particles are far apart and move freely, allowing them to fill the container.
Correct Answer: C — Far apart and moving freely
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Q. Which of the following best describes the arrangement of particles in a solid?
-
A.
Random and far apart
-
B.
Close together and fixed in place
-
C.
Close together but free to move
-
D.
Random and close together
Solution
In solids, particles are closely packed and fixed in place, giving them a definite shape.
Correct Answer: B — Close together and fixed in place
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Q. Which of the following best describes the effect of a larger slit width on the diffraction pattern?
-
A.
More pronounced diffraction
-
B.
Less pronounced diffraction
-
C.
No diffraction
-
D.
Increased number of fringes
Solution
A larger slit width results in less pronounced diffraction, leading to a narrower central maximum.
Correct Answer: B — Less pronounced diffraction
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Q. Which of the following best describes the term 'angular width' of a diffraction maximum?
-
A.
The distance between two adjacent maxima
-
B.
The angle subtended by the maximum at the source
-
C.
The width of the maximum on a screen
-
D.
The angle between the first minimum and the central maximum
Solution
The angular width of a diffraction maximum is defined as the angle between the first minimum on either side of the central maximum.
Correct Answer: D — The angle between the first minimum and the central maximum
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Q. Which of the following best describes the term 'elastic limit'?
-
A.
Maximum stress a material can withstand
-
B.
Point of permanent deformation
-
C.
Point of maximum strain
-
D.
Point of fracture
Solution
The elastic limit is the maximum stress that a material can withstand without undergoing permanent deformation.
Correct Answer: A — Maximum stress a material can withstand
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Q. Which of the following best describes the term 'shear modulus'?
-
A.
Ratio of shear stress to shear strain
-
B.
Ratio of tensile stress to tensile strain
-
C.
Ratio of compressive stress to compressive strain
-
D.
Ratio of bulk stress to bulk strain
Solution
The shear modulus is defined as the ratio of shear stress to shear strain in a material.
Correct Answer: A — Ratio of shear stress to shear strain
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Q. Which of the following biomolecules is primarily responsible for storing genetic information?
-
A.
Proteins
-
B.
Lipids
-
C.
Carbohydrates
-
D.
Nucleic acids
Solution
Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information.
Correct Answer: D — Nucleic acids
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Q. Which of the following bonds is the strongest?
-
A.
Single bond
-
B.
Double bond
-
C.
Triple bond
-
D.
All are equal
Solution
Triple bonds are the strongest type of covalent bond due to the presence of three shared electron pairs.
Correct Answer: C — Triple bond
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Q. Which of the following carbohydrates is a disaccharide?
-
A.
Maltose
-
B.
Ribose
-
C.
Cellulose
-
D.
Glycogen
Solution
Maltose is a disaccharide formed from two glucose units.
Correct Answer: A — Maltose
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Q. Which of the following carbohydrates is a ketose?
-
A.
Glucose
-
B.
Fructose
-
C.
Galactose
-
D.
Mannose
Solution
Fructose is a ketose sugar, while glucose and galactose are aldoses.
Correct Answer: B — Fructose
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Q. Which of the following carbohydrates is a reducing sugar?
-
A.
Fructose
-
B.
Sucrose
-
C.
Maltose
-
D.
Cellulose
Solution
Maltose is a reducing sugar because it has a free aldehyde or ketone group, while sucrose does not.
Correct Answer: C — Maltose
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Q. Which of the following carbohydrates is not digestible by humans?
-
A.
Starch
-
B.
Glycogen
-
C.
Cellulose
-
D.
Maltose
Solution
Cellulose is not digestible by humans due to the lack of enzymes to break it down.
Correct Answer: C — Cellulose
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Q. Which of the following carboxylic acids is a dicarboxylic acid?
-
A.
Acetic acid
-
B.
Oxalic acid
-
C.
Formic acid
-
D.
Butanoic acid
Solution
Oxalic acid is a dicarboxylic acid as it contains two carboxyl groups (-COOH).
Correct Answer: B — Oxalic acid
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Q. Which of the following carboxylic acids is a solid at room temperature?
-
A.
Acetic acid
-
B.
Formic acid
-
C.
Stearic acid
-
D.
Propanoic acid
Solution
Stearic acid is a long-chain fatty acid and is solid at room temperature.
Correct Answer: C — Stearic acid
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Q. Which of the following changes will increase the yield of products in an exothermic reaction at equilibrium?
-
A.
Increase the temperature
-
B.
Decrease the pressure
-
C.
Increase the concentration of reactants
-
D.
Add a catalyst
Solution
Increasing the concentration of reactants will shift the equilibrium position to the right, favoring the formation of products.
Correct Answer: C — Increase the concentration of reactants
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Q. Which of the following changes will NOT affect the position of equilibrium for the reaction: 2SO2(g) + O2(g) ⇌ 2SO3(g)?
-
A.
Increasing the concentration of SO2
-
B.
Decreasing the temperature
-
C.
Adding a catalyst
-
D.
Increasing the volume of the container
Solution
A catalyst speeds up the rate of both the forward and reverse reactions equally, thus it does not affect the position of equilibrium.
Correct Answer: C — Adding a catalyst
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Q. Which of the following changes will NOT affect the position of equilibrium in a closed system?
-
A.
Adding a catalyst
-
B.
Changing the concentration of reactants
-
C.
Changing the pressure
-
D.
Changing the temperature
Solution
A catalyst speeds up the rate of both the forward and reverse reactions equally, thus it does not change the position of equilibrium.
Correct Answer: A — Adding a catalyst
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Q. Which of the following changes will NOT affect the position of equilibrium?
-
A.
Adding a catalyst
-
B.
Changing the concentration of reactants
-
C.
Changing the temperature
-
D.
Changing the pressure
Solution
A catalyst speeds up the rate of reaching equilibrium but does not change the position of equilibrium or the equilibrium constant.
Correct Answer: A — Adding a catalyst
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Q. Which of the following changes will shift the equilibrium to the right for the reaction: N2(g) + 3H2(g) ⇌ 2NH3(g)?
-
A.
Increase in pressure
-
B.
Decrease in temperature
-
C.
Increase in volume
-
D.
Addition of NH3
Solution
Increasing pressure shifts the equilibrium to the side with fewer moles of gas, which is the right side in this case.
Correct Answer: A — Increase in pressure
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Q. Which of the following colligative properties is affected by the number of solute particles in a solution?
-
A.
Vapor pressure lowering
-
B.
Density
-
C.
Color
-
D.
Viscosity
Solution
Vapor pressure lowering is a colligative property that depends on the number of solute particles in a solution.
Correct Answer: A — Vapor pressure lowering
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Q. Which of the following colligative properties is used to determine molar mass?
-
A.
Boiling point elevation
-
B.
Freezing point depression
-
C.
Osmotic pressure
-
D.
All of the above
Solution
All of the listed colligative properties can be used to determine the molar mass of a solute.
Correct Answer: D — All of the above
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Q. Which of the following colligative properties is used to determine the molar mass of a solute?
-
A.
Vapor pressure lowering
-
B.
Boiling point elevation
-
C.
Freezing point depression
-
D.
Osmotic pressure
Solution
Freezing point depression can be used to determine the molar mass of a solute by measuring the decrease in freezing point.
Correct Answer: C — Freezing point depression
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Q. Which of the following colors of light has the shortest wavelength?
-
A.
Red
-
B.
Green
-
C.
Blue
-
D.
Violet
Solution
Violet light has the shortest wavelength among the visible spectrum.
Correct Answer: D — Violet
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Q. Which of the following complexes exhibits geometrical isomerism?
-
A.
[Co(NH3)3Cl3]
-
B.
[Ni(CN)4]2-
-
C.
[CuCl4]2-
-
D.
[Fe(CO)6]
Solution
[Co(NH3)3Cl3] can exhibit geometrical isomerism due to the presence of different ligands in a square planar geometry.
Correct Answer: A — [Co(NH3)3Cl3]
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Q. Which of the following complexes exhibits optical isomerism?
-
A.
[Cr(en)3]3+
-
B.
[Co(NH3)6]3+
-
C.
[NiCl2(H2O)4]
-
D.
[CuCl2]
Solution
The complex [Cr(en)3]3+ exhibits optical isomerism due to its chiral nature.
Correct Answer: A — [Cr(en)3]3+
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