datavorous/entrance-exam-dataset huggingface dataset:
Why is lithium aluminium hydride considered an expensive reagent?

Options:
A Because it is difficult to synthesise
B Because it is highly toxic
C Because it is not readily available
D Because it is made from rare and costly materials

The correct answer is:
Because it is made from rare and costly materials

Solution:
Lithium aluminium hydride (LiAlH4) is considered expensive because it is synthesised from relatively rare and costly materials.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Why is lithium carbonate (Li2CO3) less stable to heat compared to other alkali metal carbonates?

Options:
A Lithium carbonate is inherently less stable due to its composition.
B Lithium carbonate is more stable to heat than other alkali metal carbonates.
C Lithium carbonate decomposes into Li2O and CO2 when heated due to its small size polarizing CO32- ions.
D Lithium carbonate does not undergo any thermal decomposition.

The correct answer is:
Lithium carbonate decomposes into Li2O and CO2 when heated due to its small size polarizing CO32- ions.

Solution:
Lithium carbonate (Li2CO3) is less stable to heat because lithium ions, being very small in size, polarize the carbonate ion (CO32-), leading to the formation of more stable lithium oxide (Li2O) and carbon dioxide (CO2) when heated.

Topic: Chemistry, s Block Elements, NEET
Why is magnesium hydroxide precipitated when hard water is boiled?

Options:
A Because magnesium hydroxide is less soluble than magnesium carbonate
B Because magnesium hydroxide has a lower solubility product than magnesium carbonate
C Because magnesium hydroxide reacts with calcium ions in the water
D Because magnesium hydroxide forms strong hydrogen bonds with water molecules

The correct answer is:
Because magnesium hydroxide has a lower solubility product than magnesium carbonate

Solution:
Magnesium hydroxide is precipitated when hard water is boiled because it has a lower solubility product (Ksp) than magnesium carbonate, making it less soluble and causing it to form a precipitate.

Topic: Chemistry, Hydrogen, NEET
Why is magnesium metal not used for the reduction of alumina in the metallurgy of aluminum, despite being thermodynamically feasible?

Options:
A The process requires extremely high temperatures.
B The process results in low purity of aluminum.
C The process is economically impractical, as it would be cost-prohibitive to operate at the required temperatures.
D The process produces hazardous by-products.

The correct answer is:
The process is economically impractical, as it would be cost-prohibitive to operate at the required temperatures.

Solution:
Correct Option is : (C)
The process is economically impractical, as it would be cost-prohibitive to operate at the required temperatures.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
Why is measurement of biomass in terms of dry weight considered more accurate?

Options:
A Because it eliminates the effects of water content
B Because it eliminates the effects of temperature
C Because it eliminates the effects of light
D Because it eliminates the effects of humidity

The correct answer is:
Because it eliminates the effects of water content

Solution:
Measurement of biomass in terms of dry weight eliminates the effects of water content and is considered more accurate.

Topic: Biology, Ecosystem, NEET
Why is methane not produced by Kolbe's electrolytic method?

Options:
A Methane is not a hydrocarbon.
B Methane requires the presence of chlorine for its formation.
C Kolbe's method only produces alkanes with an even number of carbon atoms.
D Methane is not stable under electrolysis conditions.

The correct answer is:
Kolbe's method only produces alkanes with an even number of carbon atoms.

Solution:
The Kolbe's electrolytic method specifically generates alkanes with an even number of carbon atoms, which is why methane, with just one carbon atom, cannot be produced by this method.

Topic: Chemistry, Hydrocarbons, NEET
Why is Mn3+ oxidizing?

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

The correct answer is:
Because its d4 configuration changes to d5.

Solution:
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 molecularity applicable only for elementary reactions and order is applicable for elementary as well as complex reactions?

Options:
A Molecularity is more accurate than order for describing complex reactions.
B Molecularity is an outdated concept and is no longer used in chemistry.
C because a complex reaction proceeds through several elementary reactions.
D because an elementary reaction proceeds through several complex reactions.

The correct answer is:
because a complex reaction proceeds through several elementary reactions.

Solution:
Correct Option is : (C)
because a complex reaction proceeds through several elementary reactions.

Topic: Chemistry, Chemical Kinetics, NEET
Why is N2less reactive at room temperature?

Options:
A Due to a decrease in atomic size.
B Due to the high electronegativity of nitrogen.
C Due to the presence of a triple bond between nitrogen atoms.
D Due to a lack of available unpaired electrons for bonding.

The correct answer is:
Due to the presence of a triple bond between nitrogen atoms.

Solution:
Correct Option is : (C)
Due to the presence of a triple bond between nitrogen atoms.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Why is [NiCl4]2–paramagnetic but [Ni(CO)4] is diamagnetic though both are tetrahedral?

Options:
A The presence of Nickel results in stronger ligand-metal bonding, causing diamagnetism in [Ni(CO)4].
B The nature of the ligands in [NiCl4]2–is different from [Ni(CO)4], leading to distinct magnetic properties.
C [Ni(CO)4] is paramagnetic due to the presence of a strong ligand like CO, while [NiCl4]2–is diamagnetic.
D The oxidation state of Ni in [Ni(CO)4] is different from [NiCl4]2–, affecting their magnetic behaviour.

The correct answer is:
The nature of the ligands in [NiCl4]2–is different from [Ni(CO)4], leading to distinct magnetic properties.

Solution:
Correct Option is : (B)
The nature of the ligands in [NiCl4]2–is different from [Ni(CO)4], leading to distinct magnetic properties.

Topic: Chemistry, Coordination Compounds, NEET
Why is nitrogen restricted to a maximum covalency of 4 in compounds?

Options:
A Lack of d orbitals
B Lack of p orbitals
C Lack of s orbitals
D Lack of electrons

The correct answer is:
Lack of d orbitals

Solution:
The paragraph explains that nitrogen is restricted to a maximum covalency of 4 because it lacks d orbitals for bonding.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Why is N,N-diethyl benzene sulphonamide insoluble in alkali?

Options:
A It is a nonpolar compound
B It is a weak acid
C It is a strong acid
D It does not contain any acidic hydrogen

The correct answer is:
It does not contain any acidic hydrogen

Solution:
N,N-diethyl benzene sulphonamide is insoluble in alkali because it does not contain any acidic hydrogen.

Topic: Chemistry, Amines, NEET
Why is nomenclature important in Coordination Chemistry?

Options:
A To confuse chemists
B To make formulas more complex
C To ensure systematic naming and avoid ambiguity
D To simplify the naming process

The correct answer is:
To ensure systematic naming and avoid ambiguity

Solution:
Nomenclature is important in Coordination Chemistry to provide a systematic and unambiguous method of naming and describing formulas, especially when dealing with isomers.

Topic: Chemistry, Coordination Compounds, NEET
Why is ozone thermodynamically less stable than oxygen?

Options:
A Because ozone has a lower bond dissociation energy than oxygen.
B Because ozone has a higher heat of formation than oxygen.
C Because ozone has a higher entropy than oxygen.
D Because ozone has large negative Gibbs energy change(∆G) for its conversion into oxygen.

The correct answer is:
Because ozone has large negative Gibbs energy change(∆G) for its conversion into oxygen.

Solution:
Correct Option is : (D)
Because ozone has large negative Gibbs energy change(∆G) for its conversion into oxygen.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Why is picric acid considered a strong acid?

Options:
A Due to the presence of three methyl groups
B Due to the presence of three electron-donating groups
C Due to the presence of three electron-withdrawing -NO2 groups
D Due to the presence of three halogen atoms

The correct answer is:
Due to the presence of three electron-withdrawing -NO2 groups

Solution:
Picric acid is a strong acid because of the electron-withdrawing nature of the -NO2 groups it contains.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Why is p-nitrophenol less volatile than o-nitrophenol?

Options:
A Due to intramolecular hydrogen bonding
B Due to intermolecular hydrogen bonding
C Due to resonance stabilisation
D Due to dipole-dipole interactions

The correct answer is:
Due to intermolecular hydrogen bonding

Solution:
Para-nitrophenol forms intermolecular hydrogen bonds between molecules, making it less volatile compared to ortho-nitrophenol.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Why is propan-2-ol (

Options:
A considered achiral?
A) Because it contains an asymmetric carbon.
B Because all four groups attached to the tetrahedral carbon are different.
C Because it does not contain any carbon atoms.
D Because its mirror image can be overlapped with its original structure.

The correct answer is:
Because its mirror image can be overlapped with its original structure.

Solution:
When the mirror image (

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Why is p-toluenesulfonyl chloride often used instead of benzenesulfonyl chloride?

Options:
A It is less expensive
B It is more reactive
C It is less toxic
D It provides better yields

The correct answer is:
It is more reactive

Solution:
p-Toluenesulfonyl chloride is often used because it is more reactive and provides better yields in sulfonamide formation.

Topic: Chemistry, Amines, NEET
Why is quantitative analysis of compounds important in organic chemistry?

Options:
A To determine the color of the compound
B To identify the odor of the compound
C To calculate the mass per cent of elements
D To test the compound's solubility

The correct answer is:
To calculate the mass per cent of elements

Solution:
Quantitative analysis of compounds is important to determine the mass per cent of elements present in a compound.

Topic: Chemistry, General Organic Chemistry, NEET
Why is RNA better for the transmission of genetic information?

Options:
A RNA is more stable than DNA
B RNA directly codes for the synthesis of proteins
C RNA has a shorter life span than DNA
D DNA depends on RNA for synthesis of proteins

The correct answer is:
RNA directly codes for the synthesis of proteins

Solution:
RNA is better for the transmission of genetic information because it directly codes for the synthesis of proteins.

Topic: Biology, Molecular Basis of Inheritance, NEET
Why is rotation about the carbon-carbon double bond (C=
C) restricted?

Options:
A To maximize the overlap of s orbitals
B To maximize the overlap of p orbitals
C To form a triple bond
D To increase stability

The correct answer is:
To maximize the overlap of p orbitals

Solution:
Rotation about the carbon-carbon double bond (C=

Topic: Chemistry, General Organic Chemistry, NEET
Why is salt sprinkled on snow-covered roads in hilly areas to aid in clearing them, and what phenomenon is responsible for this process?

Options:
A Salt increases friction between tires and snow, aiding traction.
B Salt lowers the freezing point of water, causing snow to melt.
C Salt absorbs sunlight, accelerating snow melting.
D Salt chemically reacts with snow, breaking it down into water and minerals.

The correct answer is:
Salt lowers the freezing point of water, causing snow to melt.

Solution:
Correct Option is : (B)
Salt lowers the freezing point of water, causing snow to melt.

Topic: Chemistry, Solutions, NEET
Why is [SiF₆]²⁻ known, while [SiCl₆]²⁻ is not?

Options:
A Fluoride ions have a smaller size and can accommodate around Si⁴⁺.
B Chloride ions have a smaller size and can accommodate around Si⁴⁺.
C Chloride ions have a larger size and can accommodate around Si⁴⁺.
D Fluoride ions have a larger size and can accommodate around Si⁴⁺.

The correct answer is:
Fluoride ions have a smaller size and can accommodate around Si⁴⁺.

Solution:
Correct Option is : (A)
Fluoride ions have a smaller size and can accommodate around Si⁴⁺.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Why is silica in its normal form almost non-reactive?

Options:
A Due to its high Si-O bond enthalpy
B Due to its high reactivity with halogens
C Due to its metallic bonding
D Due to its low Si-O bond enthalpy

The correct answer is:
Due to its high Si-O bond enthalpy

Solution:
Silica is almost non-reactive because of its "very high Si—O bond enthalpy."

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Why is SO3not absorbed directly in water to form H2SO4in the preparation of H2SO4by Contact Process?

Options:
A It forms an unstable compound with water.
B SO3is highly reactive with water, causing explosions.
C Acid fog is formed, which is difficult to condense.
D SO3is not a suitable precursor for H2SO4production.

The correct answer is:
Acid fog is formed, which is difficult to condense.

Solution:
Correct Option is : (C)
Acid fog is formed, which is difficult to condense.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Why is soap considered effective in emulsification?

Options:
A It forms stable aggregates
B It has a high critical micelle concentration
C It has both hydrophilic and hydrophobic parts
D It reacts chemically with oil

The correct answer is:
It has both hydrophilic and hydrophobic parts

Solution:
Soap is effective in emulsification because it has both hydrophilic and hydrophobic parts, allowing it to form micelles around oil droplets.

Topic: Chemistry, Surface Chemistry, NEET
Why is sodium hydrogen carbonate used in baking?

Options:
A To add flavor to baked goods
B To provide a source of sodium in the diet
C To generate bubbles of carbon dioxide and make baked goods light and fluffy
D To act as a preservative in baked goods

The correct answer is:
To generate bubbles of carbon dioxide and make baked goods light and fluffy

Solution:
Sodium hydrogencarbonate is used in baking because it decomposes on heating, generating bubbles of carbon dioxide, which creates a leavening effect, leaving holes in cakes or pastries and making them light and fluffy.

Topic: Chemistry, s Block Elements, NEET
Why is species diversity generally highest in the tropics?

Options:
A They provide a relatively constant environment
B They receive more solar energy
C They have had more evolutionary time
D All of the above

The correct answer is:
All of the above

Solution:
The species diversity in the tropics is generally highest because they had more evolutionary time, provide a relatively constant environment, and receive more solar energy.

Topic: Biology, Biodiversity and its Conservation, NEET
Why is strong hydrogen bonding found in H2O but not in H2S?

Options:
A Differences in atomic mass
B Differences in atomic radius
C Differences in electronegativity
D Differences in metallic character

The correct answer is:
Differences in atomic radius

Solution:
The paragraph does not explicitly mention the reason but implies that differences in atomic size or radius contribute to the presence of strong hydrogen bonding in H2O but not in H2S.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Why is sucrose classified as a disaccharide?

Options:
A It contains two carbon atoms
B It is composed of two glucose molecules
C It consists of two monosaccharide units
D It has two glycosidic linkages

The correct answer is:
It consists of two monosaccharide units

Solution:
Sucrose is classified as a disaccharide because it consists of two monosaccharide units, glucose and fructose.

Topic: Chemistry, Biomolecules, NEET
Why is sucrose considered a non-reducing sugar?

Options:
A It does not contain carbon
B It does not react with water
C Its reducing groups are involved in glycosidic bond formation
D It is not sweet in taste

The correct answer is:
Its reducing groups are involved in glycosidic bond formation

Solution:
The reducing groups of glucose and fructose in sucrose are involved in glycosidic bond formation, making sucrose a non-reducing sugar.

Topic: Chemistry, Biomolecules, NEET
Why is sulfide ore of copper heated in a furnace after mixing with silica?

Options:
A Heating with silica helps in the reduction of copper oxide to metallic copper.
B Silica prevents the oxidation of copper sulfide during heating.
C Heating with silica removes impurities by adsorption.
D Iron oxide present as impurity in sulfide ore of copper forms slag which is iron silicate and copper is produced in the form of copper matte.

The correct answer is:
Iron oxide present as impurity in sulfide ore of copper forms slag which is iron silicate and copper is produced in the form of copper matte.

Solution:
Correct Option is : (D)
Iron oxide present as impurity in sulfide ore of copper forms slag which is iron silicate and copper is produced in the form of copper matte.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
Why is sulfonamide soluble in alkali?

Options:
A It is a nonpolar compound
B It is a weak acid
C It is a strong acid
D It contains a strong electron-donating group

The correct answer is:
It is a weak acid

Solution:
Sulfonamide is soluble in alkali because it contains weakly acidic hydrogen due to the sulfonyl group.

Topic: Chemistry, Amines, NEET
Why is sulphuric acid not used during the reaction of alcohols with KI?

Options:
A Sulphuric acid is too weak of an acid to facilitate the reaction.
B H2SO4cannot be used along with KI in the conversion of an alcohol to an alkyl iodide as it converts KI to corresponding acid, HI which is then oxidised by it to I2.
C Sulphuric acid accelerates the reaction but leads to the formation of unstable intermediates.
D Sulphuric acid interferes with the solubility of potassium iodide in the reaction mixture.

The correct answer is:
H2SO4cannot be used along with KI in the conversion of an alcohol to an alkyl iodide as it converts KI to corresponding acid, HI which is then oxidised by it to I2.

Solution:
Correct Option is : (B)
H2SO4cannot be used along with KI in the conversion of an alcohol to an alkyl iodide as it converts KI to corresponding acid, HI which is then oxidised by it to I2.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Why is temperature considered an intensive property?

Options:
A Temperature is unrelated to matter.
B Temperature depends on the size of the container.
C Temperature varies with the quantity of matter.
D Temperature is a molar property.

The correct answer is:
Temperature is unrelated to matter.

Solution:
Temperature is considered an intensive property because it is independent of the quantity or size of matter present in the system.

Topic: Chemistry, Thermodynamics (C), NEET
Why is terrestrial adaptation necessary for the production of lesser toxic nitrogenous wastes?

Options:
A For easy removal of waste
B For better digestion
C For conservation of water
D For better health

The correct answer is:
For conservation of water

Solution:
Terrestrial adaptation necessitated the production of lesser toxic nitrogenous wastes like urea and uric acid for conservation of water.

Topic: Biology, Excretory Products and their Elimination, NEET
Why is the +3 state of Mn of little importance?

Options:
A Because it has a low melting point
B Because it has a small atomic size
C Because it has a high sublimation enthalpy
D Because of the much larger third ionization energy of Mn

The correct answer is:
Because of the much larger third ionization energy of Mn

Solution:
The much larger third ionization energy of Mn is the primary reason why the +3 state of Mn is of little importance.

Topic: Chemistry, d and f Block Elements, NEET
Why is the actual volume of gas molecules considered negligible in comparison to the empty space between them?

Options:
A Gas molecules are extremely small
B Gas molecules are closely packed
C Gas molecules have a large mass
D Gas molecules have strong intermolecular forces

The correct answer is:
Gas molecules are extremely small

Solution:
The actual volume of gas molecules is considered negligible because gas molecules are extremely small.

Topic: Chemistry, States of Matter, NEET
Why is the addition of hydrogen cyanide (HCN) to aldehydes and ketones catalysed by a base?

Options:
A To increase the reaction rate
B To decrease the reaction rate
C To eliminate the need for HCN
D To generate a stronger nucleophile

The correct answer is:
To increase the reaction rate

Solution:
The addition of hydrogen cyanide (HCN) to aldehydes and ketones is catalysed by a base to increase the reaction rate, as it occurs very slowly with pure HCN.

Topic: Chemistry, Aldehydes, Ketones and Carboxylic Acids, NEET
Why is the aqueous solution of ammonia considered weakly basic?

Options:
A Because it forms strong bases
B Because it has a high pH
C Because it forms OH- ions
D Because it forms NH3 molecules

The correct answer is:
Because it forms OH- ions

Solution:
The paragraph explains that the weak basic nature of ammonia's aqueous solution is due to the formation of OH- ions.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Why is the aqueous solution of ammonia weakly basic?

Options:
A Due to the formation of H+ ions
B Due to the formation of OH- ions
C Due to the formation of NH4+ ions
D Due to the absence of ions

The correct answer is:
Due to the formation of OH- ions

Solution:
The paragraph mentions that the aqueous solution of ammonia is weakly basic due to the formation of OH- ions.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Why is the blood pressure in humans greater at the feet than at the brain?

Options:
A Due to the gravitational effects on blood flow
B To facilitate efficient oxygen delivery to lower extremities
C To prevent excessive pressure in the delicate blood vessels of the brain
D Because of the muscular pumping action of the heart

The correct answer is:
Due to the gravitational effects on blood flow

Solution:
Correct Option is : (A)
Due to the gravitational effects on blood flow

Topic: Chemistry, Mechanical Properties of Fluids, NEET
Why is the calculation of lattice enthalpy more complex than just considering the interaction between ions?

Options:
A Because ions do not interact with each other in a crystal lattice
B Because lattice enthalpy depends only on the size of ions
C Because lattice enthalpy depends on factors associated with crystal geometry
D Because lattice enthalpy is a constant value for all ionic compounds

The correct answer is:
Because lattice enthalpy depends on factors associated with crystal geometry

Solution:
The calculation of lattice enthalpy is more complex because it depends on factors associated with crystal geometry.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Why is the C—Cl bond length shorter in haloarenes compared to haloalkanes?

Options:
A Due to a greater s-character of carbon in haloarenes
B Due to a greater s-character of chlorine in haloarenes
C Due to a lower s-character of carbon in haloarenes
D Due to a lower s-character of chlorine in haloarenes

The correct answer is:
Due to a greater s-character of carbon in haloarenes

Solution:
The C—Cl bond length is shorter in haloarenes because sp2 hybridized carbon in haloarenes has greater s-character.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET