datavorous/entrance-exam-dataset huggingface dataset:
Why is citric acid named as such?

Options:
A Because it is found in citrus fruits
B Because of its molecular structure
C Because it is a common acid
D Because it is derived from petroleum

The correct answer is:
Because it is found in citrus fruits

Solution:
Citric acid is named so because it is found in citrus fruits.

Topic: Chemistry, General Organic Chemistry, NEET
Why is classical smog also referred to as reducing smog?

Options:
A It reduces air pollution levels.
B It reduces visibility due to smoke and fog.
C It contains chemicals that act as reducing agents.
D It reduces the impact of sunlight on hydrocarbons.

The correct answer is:
It contains chemicals that act as reducing agents.

Solution:
Classical smog is called reducing smog because it contains chemicals, such as sulfur dioxide, that act as reducing agents.

Topic: Chemistry, Environmental Chemistry, NEET
Why is CNG better than diesel?

Options:
A CNG is more expensive
B CNG can be siphoned off
C CNG burns more efficiently
D CNG is adulterated

The correct answer is:
CNG burns more efficiently

Solution:
CNG burns most efficiently, unlike petrol or diesel, in the automobiles and very little of it is left unburnt.

Topic: Biology, Environmental Issues, NEET
Why is control of pH important in many chemical and biochemical processes?

Options:
A It regulates body temperature.
B It ensures proper hydration.
C It influences the speed of sound.
D It affects the behavior of enzymes.

The correct answer is:
It affects the behavior of enzymes.

Solution:
The paragraph indicates that control of pH is crucial in chemical and biochemical processes, suggesting that pH plays a significant role in enzyme behavior.

Topic: Chemistry, Ionic Equilibrium, NEET
Why is Cr2+reducing and Mn3+oxidizing when both have d4configuration?

Options:
A Cr2+is reducing as its configuration changes from d4to d3(half-filled t2glevel) but the change from Mn3+to Mn2+results in the half-filled (d5) configuration which has extra stability.
B Mn3+has a higher effective nuclear charge than Cr2+.
C Cr2+has a higher ionization energy than Mn3+.
D Mn3+has a greater number of unpaired electrons in its d-orbitals.

The correct answer is:
Cr2+is reducing as its configuration changes from d4to d3(half-filled t2glevel) but the change from Mn3+to Mn2+results in the half-filled (d5) configuration which has extra stability.

Solution:
Correct Option is : (A)
Cr2+is reducing as its configuration changes from d4to d3(half-filled t2glevel) but the change from Mn3+to Mn2+results in the half-filled (d5) configuration which has extra stability.

Topic: Chemistry, d and f Block Elements, NEET
Why is Cr2+ reducing?

Options:
A Because its d4 configuration changes to d3.
B Because its d4 configuration changes to d5.
C Because its d4 configuration changes to d2.
D Because its d4 configuration changes to d6.

The correct answer is:
Because its d4 configuration changes to d3.

Solution:
Cr2+ is reducing as its configuration changes from d4 to d3, which results in a half-filled t2g level.

Topic: Chemistry, d and f Block Elements, NEET
Why is [Cr(NH3)6]3+paramagnetic while [Ni(CN)4]2–is diamagnetic?

Options:
A [Cr(NH3)6]3+has unpaired electrons due to the presence of a weak ligand like NH3, while [Ni(CN)4]2–has a very strong ligand like CN, so exhibits diamagnetism.
B [Cr(NH3)6]3+has a higher oxidation state than [Ni(CN)4]2–, resulting in paramagnetism.
C [Cr(NH3)6]3+has a larger coordination number than [Ni(CN)4]2–, leading to paramagnetism.
D [Cr(NH3)6]3+and [Ni(CN)4]2–both have unpaired electrons, so they are both paramagnetic.

The correct answer is:
[Cr(NH3)6]3+has unpaired electrons due to the presence of a weak ligand like NH3, while [Ni(CN)4]2–has a very strong ligand like CN, so exhibits diamagnetism.

Solution:
Correct Option is : (A)
[Cr(NH3)6]3+has unpaired electrons due to the presence of a weak ligand like NH3, while [Ni(CN)4]2–has a very strong ligand like CN, so exhibits diamagnetism.

Topic: Chemistry, Coordination Compounds, NEET
Why is desorption important for a substance to act as a good catalyst?

Options:
A Desorption helps in the regeneration of the catalyst.
B Desorption increases the concentration of reactants.
C Desorption provides additional activation energy.
D Desorption prevents the formation of by-products.

The correct answer is:
Desorption helps in the regeneration of the catalyst.

Solution:
Correct Option is : (A)
Desorption helps in the regeneration of the catalyst.

Topic: Chemistry, Surface Chemistry, NEET
Why is diamond considered the hardest substance on Earth?

Options:
A Because it is composed of a single element
B Because of its high melting point
C Because of its extended covalent bonding and difficulty to break
D Because of its high density

The correct answer is:
Because of its extended covalent bonding and difficulty to break

Solution:
Diamond is considered the hardest substance on Earth because of its extended covalent bonding, which is difficult to break.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Why is dihydrogen relatively inert at room temperature?

Options:
A Because it has a complete electronic configuration
B Because it has a low atomic mass
C Because it has a high H-H bond enthalpy
D Because it has a strong odor

The correct answer is:
Because it has a high H-H bond enthalpy

Solution:
Dihydrogen is relatively inert at room temperature due to its high H-H bond enthalpy, which makes it less reactive under normal conditions.

Topic: Chemistry, Hydrogen, NEET
Why is dinitrogen rather inert at room temperature?

Options:
A Because of the high bond enthalpy of the N≡N bond.
B Because of the low solubility of dinitrogen in water.
C Because of the high freezing point of dinitrogen.
D Because of the low boiling point of dinitrogen.

The correct answer is:
Because of the high bond enthalpy of the N≡N bond.

Solution:
The paragraph states that dinitrogen is rather inert at room temperature because of the high bond enthalpy of the N≡N bond. The N≡N bond is a triple bond, which is the strongest type of chemical bond. This makes dinitrogen difficult to react with other substances at room temperature.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Why is dioxygen a gas but sulfur a solid?

Options:
A Dioxygen has weaker intermolecular forces.
B Sulfur atoms are more tightly bonded.
C Sulfur has a larger atomic size than oxygen.
D Dioxygen has a higher boiling point.

The correct answer is:
Dioxygen has weaker intermolecular forces.

Solution:
Correct Option is : (A)
Dioxygen has weaker intermolecular forces.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Why is diversity important to the biosphere?

Options:
A To understand the significance of the diversity of life
B To learn how the biosphere would function differently if the diversity was much less
C To study the benefits of diversity of life to humans
D All of the above

The correct answer is:
All of the above

Solution:
Ecologists and evolutionary biologists have been trying to understand the significance of such diversity by asking important questions about the diversity of life and its importance to the biosphere.

Topic: Biology, Biodiversity and its Conservation, NEET
Why is electrical power required at all when the elevator is descending?

Options:
A To increase the speed of the descent
B To control the rate of descent
C To prevent the elevator from falling freely under gravity
D To provide additional lighting inside the elevator

The correct answer is:
To prevent the elevator from falling freely under gravity

Solution:
Correct Option is : (C)
To prevent the elevator from falling freely under gravity

Topic: Chemistry, Work Power Energy, NEET
Why is elemental semiconductor not suitable for producing visible light-emitting diodes (LEDs)?

Options:
A Elemental semiconductors lack the necessary energy band structure for emitting visible light.
B Elemental semiconductors have too narrow a band gap to produce visible light.
C Elemental semiconductors produce light with frequencies in the infrared (IR) region.
D Elemental semiconductors do not respond to electric current in a way that allows for visible light emission.

The correct answer is:
Elemental semiconductors produce light with frequencies in the infrared (IR) region.

Solution:
Correct Option is : (C)
Elemental semiconductors produce light with frequencies in the infrared (IR) region.

Topic: Chemistry, Semiconductors, NEET
Why is enthalpy (H) considered a state function?

Options:
A Because it depends on the path taken during a process
B Because it depends on the work done by the system
C Because it depends on internal energy only
D Because it depends on internal energy, pressure, and volume, all of which are state functions

The correct answer is:
Because it depends on internal energy, pressure, and volume, all of which are state functions

Solution:
Enthalpy (H) is considered a state function because it depends on internal energy, pressure, and volume, all of which are state functions.

Topic: Chemistry, Thermodynamics (C), NEET
Why is ethane formed as a byproduct during chlorination of methane?

Options:
A Due to the presence of excess chlorine
B Due to the reversible nature of the reaction
C Due to the propagation steps in the mechanism
D None of the above

The correct answer is:
Due to the propagation steps in the mechanism

Solution:
Ethane is formed as a byproduct during chlorination of methane due to the propagation steps in the mechanism, where more highly halogenated products can be formed.

Topic: Chemistry, Hydrocarbons, NEET
Why is excess water removed by evaporation under reduced pressure during the production of hydrogen peroxide?

Options:
A To increase the volume of the solution
B To decrease the volume of the solution
C To remove impurities
D To concentrate the hydrogen peroxide solution

The correct answer is:
To concentrate the hydrogen peroxide solution

Solution:
Excess water is removed by evaporation under reduced pressure during the production of hydrogen peroxide to concentrate the hydrogen peroxide solution, making it more concentrated and suitable for storage and use.

Topic: Chemistry, Hydrogen, NEET
Why is FeO (s) not formed in stoichiometric composition?

Options:
A Because iron (Fe) and oxygen (O) do not react with each other.
B In the crystals of FeO, some of the Fe2+cations are replaced by Fe3+ions. Three Fe2+ions are replaced by two Fe3+ions to make up for the loss of positive charge. Eventually there would be less amount of metal as compared to stoichiometric proportion.
C Because FeO can only exist as a gas.
D Because impurities in the reactants enhance the formation of FeO in its stoichiometric ratio.

The correct answer is:
In the crystals of FeO, some of the Fe2+cations are replaced by Fe3+ions. Three Fe2+ions are replaced by two Fe3+ions to make up for the loss of positive charge. Eventually there would be less amount of metal as compared to stoichiometric proportion.

Solution:
Correct Option is : (B)
In the crystals of FeO, some of the Fe2+cations are replaced by Fe3+ions. Three Fe2+ions are replaced by two Fe3+ions to make up for the loss of positive charge. Eventually there would be less amount of metal as compared to stoichiometric proportion.

Topic: Chemistry, Solid State, NEET
Why is Fe(OH)3colloid positively charged when prepared by adding FeCl3to hot water?

Options:
A Fe(OH)3ionizes and releases H+ions.
B Fe(OH)3undergoes oxidation.
C Fe(OH)3adsorbs Cl-ions from FeCl3.
D Fe(OH)3undergoes reduction.

The correct answer is:
Fe(OH)3ionizes and releases H+ions.

Solution:
Correct Option is : (A)
Fe(OH)3ionizes and releases H+ions.

Topic: Chemistry, Surface Chemistry, NEET
Why is fertilization the most critical event in sexual reproduction?

Options:
A It is essential for the successful transfer and coming together of gametes.
B It is essential for the destruction of gametes
C It is essential for the storage of gametes
D It is not essential

The correct answer is:
It is essential for the successful transfer and coming together of gametes.

Solution:
Successful transfer and coming together of gametes is essential for the most critical event in sexual reproduction, the fertilization.

Topic: Biology, Reproduction in Organisms, NEET
Why is fluorination considered too violent to be controlled?

Options:
A Fluorine radicals are highly reactive
B Fluorine has a high ionization energy
C Fluorine forms strong bonds with carbon
D None of the above

The correct answer is:
Fluorine radicals are highly reactive

Solution:
Fluorine radicals are highly reactive and tend to react explosively with organic compounds, making fluorination too violent to be controlled.

Topic: Chemistry, Hydrocarbons, NEET
Why is fluorine able to stabilize the highest oxidation state in some compounds?

Options:
A Due to higher lattice energy
B Due to higher bond enthalpy terms
C Due to both higher lattice energy and bond enthalpy terms
D Due to lower lattice energy and bond enthalpy terms

The correct answer is:
Due to both higher lattice energy and bond enthalpy terms

Solution:
Fluorine's ability to stabilize the highest oxidation state is due to either higher lattice energy or higher bond enthalpy terms in compounds like VF5 and CrF6.

Topic: Chemistry, d and f Block Elements, NEET
Why is fluorine considered the best oxidant among halogens?

Options:
A It has the highest electronegativity.
B It has the lowest ionization energy.
C It has the highest atomic number.
D It has the highest melting point.

The correct answer is:
It has the highest electronegativity.

Solution:
Correct Option is : (A)
It has the highest electronegativity.

Topic: Chemistry, Redox Reactions, NEET
Why is "formic acid" named as such?

Options:
A Because it is found in ants
B Because it is a common acid
C Because it is derived from formic acid
D Because it is a systematic name

The correct answer is:
Because it is found in ants

Solution:
The paragraph explains that "formic acid" is named so because it is found in ants, and "formic" is derived from the Latin word for ant, which is "formica."

Topic: Chemistry, General Organic Chemistry, NEET
Why is fractional distillation used when the difference in boiling points of two liquids is not much?

Options:
A To increase the boiling point of the mixture
B To decrease the boiling point of the mixture
C To separate the liquids within the same temperature range
D To convert the mixture into a solid

The correct answer is:
To separate the liquids within the same temperature range

Solution:
Fractional distillation is used when the difference in boiling points of two liquids is not much to separate the liquids within the same temperature range.

Topic: Chemistry, General Organic Chemistry, NEET
Why is fractional distillation used when the difference in boiling points of two liquids is not significant?

Options:
A To make the distillation process slower
B To make the distillation process faster
C To separate the liquids within the same temperature range
D To convert the mixture into a solid

The correct answer is:
To separate the liquids within the same temperature range

Solution:
Fractional distillation is used when the difference in boiling points of two liquids is not significant to separate them within the same temperature range.

Topic: Chemistry, General Organic Chemistry, NEET
Why is geometrical isomerism not possible in tetrahedral complexes having two different types of unidentate ligands coordinated with the central metal ion?

Options:
A because the relative positions of the unidentate ligands attached to the central metal atom are the same with respect to each other.
B Tetrahedral complexes cannot exhibit geometric isomerism.
C The ligands do not have geometric isomers.
D Geometrical isomerism is possible in such complexes.

The correct answer is:
because the relative positions of the unidentate ligands attached to the central metal atom are the same with respect to each other.

Solution:
Correct Option is : (A)
because the relative positions of the unidentate ligands attached to the central metal atom are the same with respect to each other.

Topic: Chemistry, Coordination Compounds, NEET
Why is glycine named "glycine"?

Options:
A It is derived from glycogen
B It has a bitter taste
C It has a sweet taste
D It is derived from glucose

The correct answer is:
It has a sweet taste

Solution:
Glycine is named "glycine" because it has a sweet taste, with "glykos" in Greek meaning sweet.

Topic: Chemistry, Biomolecules, NEET
Why is graphite used for electrodes in batteries and industrial electrolysis?

Options:
A Because it is a precious stone
B Because it is a good conductor
C Because it is highly porous
D Because it is inert to dilute acids

The correct answer is:
Because it is a good conductor

Solution:
Graphite is used for electrodes in batteries and industrial electrolysis because it is a good conductor.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Why is hard water unsuitable for laundry?

Options:
A It is too acidic
B It contains too many dissolved gases
C It forms scum/precipitate with soap
D It is too cold

The correct answer is:
It forms scum/precipitate with soap

Solution:
Hard water is unsuitable for laundry because it forms scum or precipitate with soap, reducing its cleaning efficiency.

Topic: Chemistry, Hydrogen, NEET
Why is helium positioned in the p-block of the Periodic Table?

Options:
A Because it has a completely filled valence shell
B Because it has a high atomic number
C Because it belongs to the alkali metals
D Because it has a half-filled valence shell

The correct answer is:
Because it has a completely filled valence shell

Solution:
Strictly, helium belongs to the s-block but its positioning in the p-block along with other group 18 elements is justified because it has a completely filled valence shell (1s2) and as a result, exhibits properties characteristic of other noble gases.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Why is helium used as a diluent for oxygen in modern diving apparatus?

Options:
A Because it is flammable
B Because it is highly soluble in blood
C Because it is non-inflammable and has low solubility in blood
D Because it is a good conductor of electricity

The correct answer is:
Because it is non-inflammable and has low solubility in blood

Solution:
Helium is used as a diluent for oxygen in modern diving apparatus because it is non-inflammable and has very low solubility in blood.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Why is H₂O a liquid and H₂S a gas?

Options:
A Due to stronger hydrogen bonding in H₂O compared to H₂S.
B Due to higher atomic weight of oxygen compared to sulfur.
C Due to the lower boiling point of H₂S.
D Due to the presence of lone pairs in H₂O.

The correct answer is:
Due to stronger hydrogen bonding in H₂O compared to H₂S.

Solution:
Correct Option is : (A)
Due to stronger hydrogen bonding in H₂O compared to H₂S.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Why is hybridization involving 3p, 3d, and 4s orbitals not possible?

Options:
A 3d orbitals have higher energy than 3p and 4s orbitals.
B 3p orbitals have higher energy than 3d and 4s orbitals.
C The energies of 3p and 4s orbitals are comparable.
D The energies of 3p orbitals are significantly different from those of 4s orbitals.

The correct answer is:
The energies of 3p orbitals are significantly different from those of 4s orbitals.

Solution:
No hybridization involving 3p, 3d, and 4s orbitals is possible due to the significant difference in energies between 3p and 4s orbitals.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Why is hydrogen considered unique in behavior and best placed separately in the periodic table?

Options:
A Because hydrogen has metallic characteristics.
B Because hydrogen resembles alkali metals.
C Because hydrogen has a small nucleus.
D Because hydrogen does not exist freely and is behaviorally distinct.

The correct answer is:
Because hydrogen does not exist freely and is behaviorally distinct.

Solution:
The paragraph explains that hydrogen is unique in behavior because it does not exist freely and is best placed separately in the periodic table due to this distinct behavior.

Topic: Chemistry, Hydrogen, NEET
Why is hydrogen fluoride a liquid at room temperature (b.p. 293 K)?

Options:
A Due to its low electronegativity
B Due to its large size
C Due to the absence of hydrogen bonding
D Due to strong hydrogen bonding

The correct answer is:
Due to strong hydrogen bonding

Solution:
Hydrogen fluoride is a liquid at room temperature due to strong hydrogen bonding, which is a result of the small size and high electronegativity of fluorine.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Why is hydrogen peroxide kept away from dust?

Options:
A Dust can induce explosive decomposition of hydrogen peroxide
B Dust can neutralize the acidic nature of hydrogen peroxide
C Dust can react with hydrogen peroxide to form toxic gases
D Dust can cause hydrogen peroxide to become highly concentrated

The correct answer is:
Dust can induce explosive decomposition of hydrogen peroxide

Solution:
Dust can induce explosive decomposition of hydrogen peroxide, so it is kept away from dust for safety reasons.

Topic: Chemistry, Hydrogen, NEET
Why is hydrogen peroxide stored in wax lined bottles?

Options:
A Hydrogen peroxide is corrosive to glass.
B Hydrogen peroxide is reactive with metals.
C Wax lined bottles prevent contamination of hydrogen peroxide.
D Wax lined bottles prevent decomposition of hydrogen peroxide by light.

The correct answer is:
Wax lined bottles prevent decomposition of hydrogen peroxide by light.

Solution:
Correct Option is : (D)
Wax lined bottles prevent decomposition of hydrogen peroxide by light.

Topic: Chemistry, Hydrogen, NEET
Why is hydrogen peroxide stored in wax-lined glass or plastic vessels in the dark?

Options:
A To prevent contamination of hydrogen peroxide
B To enhance the stability of hydrogen peroxide
C To reduce the risk of explosive decomposition
D To facilitate easy access to hydrogen peroxide

The correct answer is:
To reduce the risk of explosive decomposition

Solution:
Hydrogen peroxide is stored in wax-lined glass or plastic vessels in the dark to reduce the risk of explosive decomposition.

Topic: Chemistry, Hydrogen, NEET
Why is hydroiodic acid considered the best reductant among hydrohalic compounds?

Options:
A Iodine has the highest electronegativity.
B Iodine has the lowest ionization energy.
C Iodine has the highest atomic number.
D Iodine has the highest melting point.

The correct answer is:
Iodine has the lowest ionization energy.

Solution:
Correct Option is : (B)
Iodine has the lowest ionization energy.

Topic: Chemistry, Redox Reactions, NEET
Why is ICl more reactive than I2?

Options:
A ICl has a higher atomic number, making it more reactive.
B ICl has a lower bond dissociation enthalpy, making it more reactive.
C ICl has a higher electronegativity, making it more reactive.
D ICl has a lower ionization energy, making it more reactive.

The correct answer is:
ICl has a lower bond dissociation enthalpy, making it more reactive.

Solution:
Correct Option is : (B)
ICl has a lower bond dissociation enthalpy, making it more reactive.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Why is imbibition important for seedlings?

Options:
A It allows seedlings to emerge out of the soil
B It prevents seedlings from emerging out of the soil
C It has no effect on seedlings
D None of the above

The correct answer is:
It allows seedlings to emerge out of the soil

Solution:
Imbibition is important for seedlings as it produces the pressure that allows them to emerge out of the soil into the open, without it, they probably wouldn't be able to establish.

Topic: Biology, Transport in Plants, NEET
Why is insulin not orally administered to the patient?

Options:
A Insulin is a steroid.
B It is bitter in taste.
C Its activity increases after digestion.
D It will be digested in the stomach and will become non-functional.

The correct answer is:
It will be digested in the stomach and will become non-functional.

Solution:
Insulin is a polypeptide, which will be digested by pepsin of stomach.

Topic: Biology, Biotechnology and Its Applications, NEET