Q. Which of the following represents a systematic error? (2020)
A.
Calibration error
B.
Random fluctuations
C.
Environmental changes
D.
Human error
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Solution
Systematic errors are consistent and repeatable inaccuracies, often due to calibration errors.
Correct Answer: A — Calibration error
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Q. Which of the following represents a test cross? (2020)
A.
AA x aa
B.
Aa x Aa
C.
AA x Aa
D.
aa x aa
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Solution
A test cross is performed by crossing an individual with a homozygous recessive individual (AA x aa) to determine the genotype of the former.
Correct Answer: A — AA x aa
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Q. Which of the following represents the concept of significant figures? (2023)
A.
All digits in a number
B.
Only the non-zero digits
C.
All digits except leading zeros
D.
All digits except trailing zeros
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Solution
Significant figures include all non-zero digits and any zeros between them or trailing after a decimal point.
Correct Answer: C — All digits except leading zeros
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Q. Which of the following represents the ideal gas constant? (2022)
A.
R = 0.0821 L·atm/(K·mol)
B.
R = 8.314 J/(K·mol)
C.
Both A and B
D.
None of the above
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Solution
The ideal gas constant can be represented as R = 0.0821 L·atm/(K·mol) or R = 8.314 J/(K·mol).
Correct Answer: C — Both A and B
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Q. Which of the following solids has a high degree of anisotropy? (2019)
A.
Ionic solids
B.
Covalent solids
C.
Metallic solids
D.
Molecular solids
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Solution
Covalent solids exhibit a high degree of anisotropy due to their directional bonding.
Correct Answer: B — Covalent solids
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Q. Which of the following solids has a high thermal conductivity? (2019)
A.
Ionic solids
B.
Covalent solids
C.
Metallic solids
D.
Molecular solids
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Solution
Metallic solids have high thermal conductivity due to the presence of free-moving electrons.
Correct Answer: C — Metallic solids
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Q. Which of the following solutions has the highest freezing point? (2020)
A.
0.1 M NaCl
B.
0.1 M KCl
C.
0.1 M glucose
D.
0.1 M CaCl2
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Solution
0.1 M glucose is a non-electrolyte and does not dissociate, thus it has the highest freezing point compared to the ionic solutions.
Correct Answer: C — 0.1 M glucose
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Q. Which of the following species acts as a reducing agent in the reaction 2Fe2O3 + 3C → 4Fe + 3CO2? (2020)
A.
Fe2O3
B.
C
C.
Fe
D.
CO2
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Solution
Carbon (C) acts as a reducing agent as it donates electrons to reduce Fe2O3 to Fe.
Correct Answer: B — C
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Q. Which of the following species acts as a reducing agent in the reaction 2Fe2O3 + 3C → 4Fe + 3CO? (2022)
A.
Fe2O3
B.
C
C.
Fe
D.
CO
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Solution
Carbon (C) acts as a reducing agent as it donates electrons to reduce Fe2O3 to Fe.
Correct Answer: B — C
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Q. Which of the following species can act as an oxidizing agent? (2023)
A.
Na+
B.
Cl-
C.
H2O
D.
MnO4-
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Solution
MnO4- is a strong oxidizing agent because it can gain electrons and be reduced to Mn2+.
Correct Answer: D — MnO4-
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Q. Which of the following species is the strongest oxidizing agent? (2023)
A.
F2
B.
Cl2
C.
Br2
D.
I2
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Solution
F2 is the strongest oxidizing agent among the halogens due to its high electronegativity and ability to gain electrons.
Correct Answer: A — F2
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Q. Which of the following statements about alcohols is correct? (2022)
A.
They are all soluble in water.
B.
They have higher boiling points than alkanes.
C.
They cannot form hydrogen bonds.
D.
They are all volatile.
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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.
B.
They are generally soluble in water.
C.
They have higher boiling points than alkanes.
D.
All alcohols are volatile.
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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 carboxylic acids is incorrect? (2020)
A.
They can form hydrogen bonds.
B.
They have higher boiling points than alcohols.
C.
They are less acidic than alcohols.
D.
They can be converted to esters.
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Solution
Carboxylic acids are more acidic than alcohols due to the resonance stabilization of their conjugate base, making the statement 'They are less acidic than alcohols' incorrect.
Correct Answer: C — They are less acidic than alcohols.
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Q. Which of the following statements about chemisorption is true? (2022)
A.
It is a reversible process
B.
It involves the formation of strong chemical bonds
C.
It occurs at low temperatures
D.
It is independent of the nature of the adsorbate
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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 coordination compounds is incorrect? (2023)
A.
They can exhibit geometric isomerism.
B.
They can exhibit optical isomerism.
C.
All coordination compounds are colored.
D.
They can form complexes with transition metals.
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Solution
Not all coordination compounds are colored; the color depends on the nature of the metal and the ligands involved. Some coordination compounds can be colorless.
Correct Answer: C — All coordination compounds are colored.
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Q. Which of the following statements about evolution is true? (2000)
A.
Evolution is a linear process.
B.
Evolution can occur in response to environmental changes.
C.
All traits are adaptive.
D.
Evolution results in perfect organisms.
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Solution
Evolution can occur in response to environmental changes, allowing species to adapt to new conditions over time.
Correct Answer: B — Evolution can occur in response to environmental changes.
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Q. Which of the following statements about hydrogen is incorrect? (2019)
A.
Hydrogen is the lightest element.
B.
Hydrogen can form covalent bonds.
C.
Hydrogen exists as a diatomic molecule in nature.
D.
Hydrogen is a metal at room temperature.
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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 parthenogenesis is true? (2020)
A.
It involves fertilization
B.
It is a form of sexual reproduction
C.
It produces offspring from unfertilized eggs
D.
It is common in mammals
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Solution
Parthenogenesis is a form of asexual reproduction where offspring develop from unfertilized eggs.
Correct Answer: C — It produces offspring from unfertilized eggs
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Q. Which of the following statements about respiration in plants is true? (2022)
A.
It occurs only at night
B.
It is independent of photosynthesis
C.
It produces more energy than fermentation
D.
It only occurs in leaves
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Solution
Respiration in plants produces more energy than fermentation, as it fully oxidizes glucose in the presence of oxygen.
Correct Answer: C — It produces more energy than fermentation
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Q. Which of the following statements about solutions is true? (2023)
A.
Solutes increase the boiling point of solvents
B.
Solutes decrease the freezing point of solvents
C.
Both A and B
D.
Neither A nor B
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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 about thermal conductivity is true? (2021)
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 type
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Solution
Thermal conductivity is a measure of a material's ability to conduct heat; it varies with material type.
Correct Answer: B — It is a measure of a material's ability to conduct heat
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Q. Which of the following statements is true about 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
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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 adsorption isotherms? (2023)
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 concentration and reaction rate.
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Solution
Adsorption isotherms illustrate how the amount of adsorbate on a solid surface varies with pressure at a constant temperature.
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 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 alkali metals? (2023)
A.
They are good conductors of electricity
B.
They have high ionization energies
C.
They are found in nature in free state
D.
They form acidic oxides
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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)
A.
They contain at least one double bond
B.
They are saturated hydrocarbons
C.
They have a general formula of C_nH_(2n+2)
D.
They cannot undergo addition reactions
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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)
A.
They are always saturated
B.
They contain a benzene ring
C.
They are non-polar
D.
They do not undergo electrophilic substitution
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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 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 electric current? (2019)
A.
It is the flow of protons.
B.
It is the flow of electrons.
C.
It is the flow of neutrons.
D.
It is the flow of ions.
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Solution
Electric current is defined as the flow of electrons in a conductor.
Correct Answer: B — It is the flow of electrons.
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