datavorous/entrance-exam-dataset huggingface dataset:
Why is the measurement of pH of a solution essential in various applications, including biological and cosmetic applications?

Options:
A pH measurement is necessary to determine the volume of a solution.
B pH measurement is essential for conducting chemical reactions.
C pH measurement helps in determining the acidity or alkalinity of a solution, which is crucial in biological and cosmetic applications.
D pH measurement is important for calculating the density of a solution.

The correct answer is:
pH measurement helps in determining the acidity or alkalinity of a solution, which is crucial in biological and cosmetic applications.

Solution:
pH measurement is essential in biological and cosmetic applications because it helps determine the acidity or alkalinity of a solution, which can have a significant impact on the effectiveness and safety of products.

Topic: Chemistry, Ionic Equilibrium, NEET
Why is the mixture produced by free radical chlorination or bromination of alkanes difficult to separate into pure compounds?

Options:
A Because the reaction is highly selective.
B Because the yield of any single compound is high.
C Because the yield of any single compound is low.
D Because the reaction is carried out under high pressure.

The correct answer is:
Because the yield of any single compound is low.

Solution:
The mixture obtained from this reaction is difficult to separate into pure compounds, and the yield of any single compound is low.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Why is the molecular mass of polymers expressed as an average?

Options:
A Polymers have a uniform chain length.
B The molecular mass of polymers cannot be determined.
C Polymers contain chains of varying lengths.
D Polymers always have a specific molecular mass.

The correct answer is:
Polymers contain chains of varying lengths.

Solution:
The molecular mass of polymers is expressed as an average because polymer samples contain chains of varying lengths, and it is not a uniform value.

Topic: Chemistry, Polymers, NEET
Why is the name "Buckminsterfullerene" given to a form of carbon?

Options:
A Because it is named after a famous architect
B Because it is found in geodesic domes
C Because it is a common name
D Because it is a systematic name

The correct answer is:
Because it is named after a famous architect

Solution:
"Buckminsterfullerene" is a common name given to a form of carbon due to its structural similarity to geodesic domes popularized by architect R. Buckminster Fuller.

Topic: Chemistry, General Organic Chemistry, NEET
Why is the orientation of the portable radio with respect to the broadcasting station important?

Options:
A It ensures a stronger signal reception for the radio.
B It prevents interference from other electromagnetic sources.
C It maximizes the alignment of the receiving antenna with the electric/magnetic part of the wave.
D It minimizes the distortion caused by the broadcast frequencies.

The correct answer is:
It maximizes the alignment of the receiving antenna with the electric/magnetic part of the wave.

Solution:
Correct Option is : (C)
It maximizes the alignment of the receiving antenna with the electric/magnetic part of the wave.

Topic: Chemistry, Electromagnetic Waves, NEET
Why is the osmotic pressure method advantageous for biomolecules and polymers?

Options:
A It requires high temperatures
B It requires low temperatures
C It uses molality
D It does not require stable solutions

The correct answer is:
It does not require stable solutions

Solution:
The paragraph explains that the osmotic pressure method is advantageous for biomolecules and polymers because they are generally not stable at higher temperatures.

Topic: Chemistry, Solutions, NEET
Why is the osmotic pressure method advantageous over other methods for determining molar masses?

Options:
A It is less expensive
B It works at higher temperatures
C It uses molality instead of molarity
D It operates at room temperature

The correct answer is:
It operates at room temperature

Solution:
The paragraph mentions that the osmotic pressure method is advantageous because pressure measurement is around room temperature.

Topic: Chemistry, Solutions, NEET
Why is the overall arrangement equivalent in all directions in amorphous solids?

Options:
A Because of their transparency
B Because they have a definite arrangement of particles along all directions
C Because they have short-range order
D Because they lack long-range order

The correct answer is:
Because they lack long-range order

Solution:
The overall arrangement in amorphous solids becomes equivalent in all directions because they lack long-range order, as stated in the paragraph.

Topic: Chemistry, Solid State, NEET
Why is the over-exploitation of soil and excessive use of fertilizers and pesticides a concern?

Options:
A It leads to economic growth.
B It improves soil quality.
C It results in the deterioration of soil, water, and air.
D It has no impact on the environment.

The correct answer is:
It results in the deterioration of soil, water, and air.

Solution:
Over-exploitation of soil and excessive use of fertilizers and pesticides can lead to the deterioration of soil, water, and air quality, which is a significant environmental concern.

Topic: Chemistry, Environmental Chemistry, NEET
Why is the peroxide effect or Kharash reaction not observed in the addition of HCl and HI to unsymmetrical alkenes?

Options:
A HCl and HI are stronger acids.
B HCl and HI bonds are stronger than HBr.
C HCl and HI do not form free radicals.
D HCl and HI are less available in chemical reactions.

The correct answer is:
HCl and HI bonds are stronger than HBr.

Solution:
The peroxide effect is not observed in the addition of HCl and HI to unsymmetrical alkenes because HCl and HI have stronger bonds compared to HBr, making them less susceptible to free radical cleavage.

Topic: Chemistry, Hydrocarbons, NEET
Why is the pH of a buffer solution not significantly affected by dilution?

Options:
A Dilution increases the concentration of the weak acid.
B Dilution decreases the concentration of the conjugate base.
C Dilution changes the pKa value of the acid.
D Dilution does not impact the ratio of [Conjugate acid, BH+] to [Base, B].

The correct answer is:
Dilution does not impact the ratio of [Conjugate acid, BH+] to [Base, B].

Solution:
The pH of a buffer solution is not significantly affected by dilution because dilution does not impact the ratio of [Conjugate acid, BH+] to [Base, B] in the Henderson-Hasselbalch equation.

Topic: Chemistry, Ionic Equilibrium, NEET
Why is the pH of buffer solutions relatively stable when diluted or when small amounts of acid or alkali are added?

Options:
A Due to their high salt content
B Because of their extreme acidity
C Because of the common ion effect
D Due to the presence of strong bases

The correct answer is:
Because of the common ion effect

Solution:
The stability of buffer solutions when diluted or when small amounts of acid or alkali are added is attributed to the common ion effect, as explained in the paragraph.

Topic: Chemistry, Ionic Equilibrium, NEET
Why is the phenoxide ion more reactive than phenol towards electrophilic aromatic substitution?

Options:
A It has a higher electron density on the aromatic ring.
B It has a lower electron density on the aromatic ring.
C It has a more stable resonance structure.
D It has a larger molecular size.

The correct answer is:
It has a higher electron density on the aromatic ring.

Solution:
The phenoxide ion has a negative charge on the oxygen atom, making it donate electron density to the aromatic ring, increasing its reactivity.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Why is the prevention of corrosion important?

Options:
A To increase the aesthetic appeal of metallic objects.
B To prevent accidents such as bridge collapse.
C To increase the value of metallic objects.
D To improve the conductivity of metals.

The correct answer is:
To prevent accidents such as bridge collapse.

Solution:
Prevention of corrosion is of prime importance. It not only saves money but also helps in preventing accidents such as a bridge collapse.

Topic: Chemistry, Electrochemistry, NEET
Why is the probability of reaction with molecularity higher than three very rare?

Options:
A The probability of more than three molecules colliding simultaneously is very small. Hence the possibility of molecularity being three is very low.
B High-molecularity reactions require a lower activation energy, making them less likely to occur.
C High-molecularity reactions involve complex reaction mechanisms, making them rare.
D High-molecularity reactions are typically catalyzed, making them more likely to occur.

The correct answer is:
The probability of more than three molecules colliding simultaneously is very small. Hence the possibility of molecularity being three is very low.

Solution:
Correct Option is : (A)
The probability of more than three molecules colliding simultaneously is very small. Hence the possibility of molecularity being three is very low.

Topic: Chemistry, Chemical Kinetics, NEET
Why is the property of hydrogen absorption on transition metals widely used in catalytic reduction reactions?

Options:
A It produces hydrogen gas as a byproduct.
B It changes the nature of the metal lattice.
C It increases the melting point of metals.
D It enhances the reactivity of metals.

The correct answer is:
It changes the nature of the metal lattice.

Solution:
The property of hydrogen absorption on transition metals is used in catalytic reduction reactions because it changes the nature of the metal lattice, facilitating catalytic reactions.

Topic: Chemistry, Hydrogen, NEET
Why is the reaction involving aldehydes and ketones called Aldol condensation?

Options:
A Because it involves the condensation of alcohols
B Because it involves the condensation of aldehydes and ketones
C Because it produces aldehydes and ketones
D Because it is a condensation reaction with water as the byproduct

The correct answer is:
Because it involves the condensation of aldehydes and ketones

Solution:
The term "Aldol condensation" is used because this reaction involves the condensation of both aldehydes and ketones.

Topic: Chemistry, Aldehydes, Ketones and Carboxylic Acids, NEET
Why is the reactivity of all the three classes of alcohols with conc. HCl and ZnCl2(Lucas reagent) different?

Options:
A The reactivity of alcohols with Lucas reagent is the same for all three classes, as the reagent reacts with all alcohols equally.
B The reaction of alcohols with conc. HCl and ZnCl2(Lucas reagent) are different because it occurs through intermediate formation of carbocations. More stable the carbocation, the more reactive the alcohol.
C The reactivity of alcohols with Lucas reagent depends on the size of the alcohol molecule.
D The reactivity of alcohols with Lucas reagent depends on the presence of additional functional groups in the alcohol molecule.

The correct answer is:
The reaction of alcohols with conc. HCl and ZnCl2(Lucas reagent) are different because it occurs through intermediate formation of carbocations. More stable the carbocation, the more reactive the alcohol.

Solution:
Correct Option is : (B)
The reaction of alcohols with conc. HCl and ZnCl2(Lucas reagent) are different because it occurs through intermediate formation of carbocations. More stable the carbocation, the more reactive the alcohol.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Why is the reduction of a metal oxide easier if the metal formed is in liquid state at the temperature of reduction?

Options:
A The liquid state provides a greater surface area for contact with the metal oxide.
B The liquid metal has a higher reactivity with the oxide.
C The mobility of atoms in the liquid metal allows for faster and more efficient reduction.
D The enhanced entropy change (∆S) when the metal is in a liquid state leads to a more negative ∆rG, making the reduction process easier.

The correct answer is:
The mobility of atoms in the liquid metal allows for faster and more efficient reduction.

Solution:
Correct Option is : (C)
The mobility of atoms in the liquid metal allows for faster and more efficient reduction.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
Why is the reduction of nitro compounds with iron scrap and hydrochloric acid preferred?

Options:
A Iron scrap is cheaper than other metals.
B Iron scrap catalyses the reaction.
C Hydrochloric acid is not required in this method.
D Iron scrap forms FeCl2, which is a strong reducing agent.

The correct answer is:
Iron scrap catalyses the reaction.

Solution:
Iron scrap catalyses the reduction reaction, and FeCl2 formed during the reaction helps in initiating the reaction, making it efficient. This reduces the amount of hydrochloric acid required.

Topic: Chemistry, Amines, NEET
Why is the single N-N bond weaker than the single P-P bond?

Options:
A Smaller bond length in nitrogen
B High electronegativity of nitrogen
C Interelectronic repulsion in nitrogen
D Absence of d orbitals in nitrogen

The correct answer is:
Interelectronic repulsion in nitrogen

Solution:
The paragraph explains that the single N-N bond is weaker than the single P-P bond due to high interelectronic repulsion of the non-bonding electrons in nitrogen.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Why is the solubility of haloalkanes in water very low?

Options:
A Haloalkanes aren’t very soluble in water because they can’t form hydrogen bonds.
B Haloalkanes form strong hydrogen bonds with water, reducing their solubility.
C Haloalkanes ionize in water to form insoluble ions.
D Haloalkanes react with water to produce gases, making them insoluble.

The correct answer is:
Haloalkanes aren’t very soluble in water because they can’t form hydrogen bonds.

Solution:
Correct Option is : (A)
Haloalkanes aren’t very soluble in water because they can’t form hydrogen bonds.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Why is the solubility of most salts in water temperature-dependent?

Options:
A Because water molecules form stronger bonds at higher temperatures.
B Because the enthalpy of solution (∆solH) is negative at higher temperatures.
C Because the lattice enthalpy decreases with rising temperature.
D Because the dissociation process of salts is endothermic, and higher temperatures provide the necessary energy.

The correct answer is:
Because the dissociation process of salts is endothermic, and higher temperatures provide the necessary energy.

Solution:
The solubility of most salts in water increases with rising temperature because the dissolution process is endothermic, requiring the input of energy, which is provided by higher temperatures.

Topic: Chemistry, Thermodynamics (C), NEET
Why is the sternum known to be bicephalic?

Options:
A

It is made up of two different bones.

B

It has two articulation surfaces on its ventral end.

C

It has two articulation surfaces on its dorsal end.

D

Both (a) and (b)

The correct answer is:

It has two articulation surfaces on its dorsal end.

Solution:
There are 12 pairs of ribs. Each rib is a thin flat bone connected dorsally to the vertebral column and ventrally to the sternum. It has two articulation surfaces on its dorsal end and is hence called bicephalic.

Topic: Biology, Breathing and Exchange of Gases, NEET
Why is the surface tension of a liquid independent of the area of the surface?

Options:
A Surface tension decreases with increasing surface area.
B Surface tension increases with increasing surface area.
C Surface tension is unaffected by changes in surface area.
D Surface tension depends on the shape of the surface.

The correct answer is:
Surface tension is unaffected by changes in surface area.

Solution:
Correct Option is : (C)
Surface tension is unaffected by changes in surface area.

Topic: Chemistry, Mechanical Properties of Fluids, NEET
Why is the term "aldol condensation" still used for reactions involving ketones?

Options:
A Because ketones are converted to aldehydes in the reaction.
B Because ketones produce similar products as aldehydes in the reaction.
C Because ketones react differently from aldehydes in the reaction.
D Because ketones are not involved in Aldol condensation reactions.

The correct answer is:
Because ketones produce similar products as aldehydes in the reaction.

Solution:
The term "aldol condensation" is still used for reactions involving ketones because they produce similar products as aldehydes in the reaction, despite the presence of ketols.

Topic: Chemistry, Aldehydes, Ketones and Carboxylic Acids, NEET
Why is the third law of thermodynamics important in the study of thermodynamics?

Options:
A It explains the behavior of gases at high temperatures.
B It provides a mathematical equation for entropy.
C It allows the calculation of absolute values of entropy.
D It describes the relationship between energy and work.

The correct answer is:
It allows the calculation of absolute values of entropy.

Solution:
The third law of thermodynamics is important because it permits the calculation of absolute values of entropy for pure substances from thermal data alone.

Topic: Chemistry, Thermodynamics (C), NEET
Why is the trend in the third ionization enthalpies less complicated by the 4s orbital factor?

Options:
A 4s orbitals have lower energy
B 4s orbitals have higher energy
C 4s orbitals have more electrons
D 4s orbitals are not involved in ionization

The correct answer is:
4s orbitals are not involved in ionization

Solution:
The trend in the third ionization enthalpies is less complicated by the 4s orbital factor because the 4s electrons are not involved in ionization.

Topic: Chemistry, d and f Block Elements, NEET
Why is the trend of basicity different in the aqueous phase compared to the gaseous phase?

Options:
A Aqueous phase has more alkyl groups
B Aqueous phase has less solvation
C Aqueous phase involves hydrogen bonding with water
D Aqueous phase is more polar

The correct answer is:
Aqueous phase involves hydrogen bonding with water

Solution:
In the aqueous phase, solvation and hydrogen bonding with water molecules influence the basicity of amines, leading to a different trend.

Topic: Chemistry, Amines, NEET
Why is the use of aspartame limited to cold foods and drinks?

Options:
A Aspartame is unstable at high temperatures and breaks down.
B Aspartame is too sweet for hot foods.
C Aspartame causes allergies when heated.
D Aspartame loses its flavor when heated.

The correct answer is:
Aspartame is unstable at high temperatures and breaks down.

Solution:
Correct Option is : (A)
Aspartame is unstable at high temperatures and breaks down.

Topic: Chemistry, Chemistry in Everyday Life, NEET
Why is the use of insecticides and pesticides harmful to human beings and animals?

Options:
A They are not harmful
B They are not toxic
C They are toxic and extremely harmful
D They are not as harmful as natural methods

The correct answer is:
They are toxic and extremely harmful

Solution:
The use of insecticides and pesticides is toxic and extremely harmful to human beings and animals alike.

Topic: Biology, Microbes in Human Welfare, NEET
Why is the Valence Bond (V
B) theory unable to explain the color exhibited by coordination compounds?

Options:
A It involves a number of assumptions.
B It does not give quantitative interpretation of magnetic data.
C It does not make exact predictions regarding the tetrahedral and square planar structures of 4-coordinate complexes.
D It does not consider the nature of ligands.

The correct answer is:
It does not consider the nature of ligands.

Solution:
The Valence Bond (V

Topic: Chemistry, Coordination Compounds, NEET
Why is the vapor pressure of an aqueous solution of glucose lower than that of water?

Options:
A Glucose molecules are more volatile than water molecules.
B Glucose molecules occupy positions on the liquid surface, reducing water's surface coverage.
C Glucose molecules increase the kinetic energy of water molecules, lowering vapor pressure.
D Glucose molecules react with water, reducing the vapor pressure.

The correct answer is:
Glucose molecules occupy positions on the liquid surface, reducing water's surface coverage.

Solution:
Correct Option is : (B)
Glucose molecules occupy positions on the liquid surface, reducing water's surface coverage.

Topic: Chemistry, Solutions, NEET
Why is the variation in pH with temperature often ignored?

Options:
A Variations in pH with temperature are significant and should not be ignored.
B Variations in pH with temperature are so small that they are often ignored.
C Variations in pH with temperature are not related to Kw.
D Variations in pH with temperature are not relevant in chemistry.

The correct answer is:
Variations in pH with temperature are so small that they are often ignored.

Solution:
Variations in pH with temperature are often ignored in chemistry because they are usually very small and do not significantly impact pH calculations.

Topic: Chemistry, Ionic Equilibrium, NEET
Why is there a large difference in the boiling points of butanal and butan-1-ol?

Options:
A Butan-1-ol has a more extended carbon chain than butanal.
B Butan-1-ol has higher boiling point due to intermolecular hydrogen bonding.
C Butan-1-ol has a higher molecular mass than butanal.
D Butanal has a polar functional group, making it more volatile.

The correct answer is:
Butan-1-ol has higher boiling point due to intermolecular hydrogen bonding.

Solution:
Correct Option is : (B)
Butan-1-ol has higher boiling point due to intermolecular hydrogen bonding.

Topic: Chemistry, Aldehydes and Ketones, NEET
Why is there a need for the judicious use of insecticides, pesticides, and herbicides in agriculture?

Options:
A To increase crop yield
B To reduce the cost of farming
C To prevent food spoilage during storage
D To minimize environmental impact

The correct answer is:
To minimize environmental impact

Solution:
Judicious use of insecticides, pesticides, and herbicides is necessary to minimize their environmental impact, such as soil pollution.

Topic: Chemistry, Environmental Chemistry, NEET
Why is there a regular decrease in the size of the entire 4f orbitals as the nuclear charge increases along the series?

Options:
A Due to the decrease in metallic radius.
B Due to the filling of 5d orbitals.
C Due to the imperfect shielding of one 4f electron by another.
D Due to the intervention of the 4f orbitals.

The correct answer is:
Due to the imperfect shielding of one 4f electron by another.

Solution:
The regular decrease in the size of the entire 4f orbitals is due to the imperfect shielding of one 4f electron by another.

Topic: Chemistry, d and f Block Elements, NEET
Why is there almost 100% ionization in the case of sodium chloride in contrast to acetic acid?

Options:
A Sodium chloride is a weak electrolyte, while acetic acid is a strong electrolyte.
B Sodium chloride contains polar water molecules, while acetic acid does not.
C Sodium chloride is a strong electrolyte, while acetic acid is a weak electrolyte.
D Sodium chloride is a non-electrolyte, while acetic acid is an electrolyte.

The correct answer is:
Sodium chloride is a strong electrolyte, while acetic acid is a weak electrolyte.

Solution:
The paragraph explains that there is almost 100% ionization in the case of sodium chloride because it is a strong electrolyte, whereas acetic acid is a weak electrolyte.

Topic: Chemistry, Ionic Equilibrium, NEET
Why is there no change in the mass of ice and water in this equilibrium scenario?

Options:
A Because the temperature is constant.
B Because the equilibrium is static.
C Because the rates of molecule transfer are equal.
D Because the pressure is high.

The correct answer is:
Because the rates of molecule transfer are equal.

Solution:
There is no change in the mass of ice and water because the rates of transfer of molecules from ice into water and from water into ice are equal.

Topic: Chemistry, Chemical Equilibrium, NEET