datavorous/entrance-exam-dataset huggingface dataset:
Why is a low temperature favorable for a high yield of ammonia in the ammonia production reaction?

Options:
A Low temperature speeds up the reaction.
B Low temperature increases the equilibrium concentration of ammonia.
C Low temperature is exothermic.
D Low temperature slows down the reaction.

The correct answer is:
Low temperature slows down the reaction.

Solution:
Low temperature is favorable for a high yield of ammonia because it slows down the reaction and allows more ammonia to accumulate at equilibrium.

Topic: Chemistry, Chemical Equilibrium, NEET
Why is a negative sign used in the expression for pressure-volume work (w) in thermodynamics?

Options:
A To indicate work done by the system
B To indicate work done on the surroundings
C To obtain a positive value for work done on the system during compression
D To account for the change in volume

The correct answer is:
To obtain a positive value for work done on the system during compression

Solution:
The negative sign is used in the expression for pressure-volume work to ensure that the work done on the system during compression is assigned a positive value.

Topic: Chemistry, Thermodynamics (C), NEET
Why is a silent electrical discharge used in the preparation of ozone?

Options:
A To generate heat
B To produce UV radiation
C To prevent the decomposition of ozone
D To remove oxygen from the reaction

The correct answer is:
To prevent the decomposition of ozone

Solution:
A silent electrical discharge is used in the preparation of ozone to prevent its decomposition, as the formation of ozone from oxygen is an endothermic process.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Why is a single Lewis structure often inadequate for representing a molecule?

Options:
A Because it doesn't consider the number of atoms in the molecule.
B Because it doesn't consider the bond enthalpy of the molecule.
C Because it doesn't consider the experimentally determined parameters of the molecule.
D Because it doesn't consider the electron configuration of the molecule.

The correct answer is:
Because it doesn't consider the experimentally determined parameters of the molecule.

Solution:
A single Lewis structure is often inadequate for representing a molecule in conformity with its experimentally determined parameters.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Why is a solution of [Ni(H2O)6]2+green, but a solution of [Ni(CN)4]2–is colourless?

Options:
A The green colour in [Ni(H2O)6]2+arises from the presence of water ligands, which releasing light in the green region of the electromagnetic spectrum.
B The cyanide ions in [Ni(CN)4]2–cause a green colour due to their strong absorption of green light.
C The green colour of [Ni(H2O)6]2+is due to the nickel ion's natural colour.
D [Ni(H2O)6]2+is green because water is a weak field ligand and it allows unpaired electrons and thus results in d-d transition ultimately resulting in colour but in the case of [Ni(CN)4]2–, CN-ions pair up the electrons,not allowing transition to happen

The correct answer is:
[Ni(H2O)6]2+is green because water is a weak field ligand and it allows unpaired electrons and thus results in d-d transition ultimately resulting in colour but in the case of [Ni(CN)4]2–, CN-ions pair up the electrons,not allowing transition to happen

Solution:
Correct Option is : (D)
[Ni(H2O)6]2+is green because water is a weak field ligand and it allows unpaired electrons and thus results in d-d transition ultimately resulting in colour but in the case of [Ni(CN)4]2–, CN-ions pair up the electrons,not allowing transition to happen

Topic: Chemistry, Coordination Compounds, NEET
Why is a solution of potassium hydroxide used to absorb carbon dioxide evolved during the estimation of carbon present in an organic compound?

Options:
A A solution of potassium hydroxide is used to absorb carbon dioxide because it does not form a stable precipitate with carbon dioxide gas, making it harder to collect and measure the evolved carbon dioxide.
B A solution of potassium hydroxide is used to react with any acidic impurities that may be present in the evolved carbon dioxide, neutralizing them and preventing interference with the estimation of carbon.
C A solution of potassium hydroxide is used to provide a basic environment, promoting the release of carbon dioxide from the organic compound during the estimation process.
D A solution of potassium hydroxide is used to trap carbon dioxide and convert it into potassium carbonate, which can be weighed to determine the % of carbon present in the organic compound.

The correct answer is:
A solution of potassium hydroxide is used to trap carbon dioxide and convert it into potassium carbonate, which can be weighed to determine the % of carbon present in the organic compound.

Solution:
Correct Option is : (D)
A solution of potassium hydroxide is used to trap carbon dioxide and convert it into potassium carbonate, which can be weighed to determine the % of carbon present in the organic compound.

Topic: Chemistry, General Organic Chemistry, NEET
Why is a tertiary halide formed when one of the alkyl groups in the ether is tertiary?

Options:
A Tertiary groups are more reactive.
B Tertiary groups prevent the formation of a carbocation.
C Tertiary groups stabilise the carbocation intermediate.
D Tertiary groups enhance nucleophilic substitution.

The correct answer is:
Tertiary groups stabilise the carbocation intermediate.

Solution:
Tertiary alkyl groups stabilise the carbocation intermediate, leading to the formation of a tertiary halide when one of the alkyl groups in the ether is tertiary.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Why is a tertiary halide formed when one of the alkyl groups in the ether is tertiary?

Options:
A Tertiary groups are more reactive.
B Tertiary groups stabilise the carbocation intermediate.
C Tertiary groups prevent the formation of a carbocation.
D Tertiary groups enhance nucleophilic substitution.

The correct answer is:
Tertiary groups stabilise the carbocation intermediate.

Solution:
When one of the alkyl groups in the ether is tertiary, the resulting tertiary carbocation intermediate is more stable, leading to the formation of a tertiary halide.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Why is a visit to a sewage treatment plant an interesting and educating experience?

Options:
A To see the man-made technology
B To learn about the microbial treatment process
C To see the reduction in water-borne diseases
D To observe the increase in pollution

The correct answer is:
To learn about the microbial treatment process

Solution:
A visit to a sewage treatment plant can provide an interesting and educating experience, as one can learn about the microbial treatment process used for sewage treatment.

Topic: Biology, Microbes in Human Welfare, NEET
Why is acetone obtained as a by-product in the synthesis of phenol from cumene?

Options:
A It is a reactant in the synthesis
B It is used to purify phenol
C It is an intermediate in the reaction
D It is a side product of the reaction

The correct answer is:
It is an intermediate in the reaction

Solution:
Acetone is an intermediate product formed during the conversion of cumene into phenol in the synthesis process.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Why is actinoid contraction greater from element to element than lanthanoid contraction?

Options:
A Actinides have a higher atomic number than lanthanides.
B Actinides experience a stronger effective nuclear charge than lanthanides.
C because the 5f electrons themselves provide poor shielding from element to element in the actinoid series.
D Actinides have a greater affinity for oxygen and fluorine.

The correct answer is:
because the 5f electrons themselves provide poor shielding from element to element in the actinoid series.

Solution:
Correct Option is : (C)
because the 5f electrons themselves provide poor shielding from element to element in the actinoid series.

Topic: Chemistry, d and f Block Elements, NEET
Why is activated charcoal used in water filters?

Options:
A Because it conducts electricity
B Because it is lightweight
C Because it can remove organic contaminators
D Because it is a precious stone

The correct answer is:
Because it can remove organic contaminators

Solution:
Activated charcoal is used in water filters to remove organic contaminators.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Why is active research being conducted on the genetics of apomixis?

Options:
A To understand the mechanism of apomixis
B To transfer apomictic genes into hybrid varieties
C Both A) and B)
D None of the above

The correct answer is:
Both A) and B)

Solution:
Active research is being conducted on the genetics of apomixis to understand the mechanism of apomixis and to transfer apomictic genes into hybrid varieties.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
Why is adsorption always exothermic?

Options:
A Adsorption is always endothermic, not exothermic.
B Adsorption involves the release of energy, making it exothermic.
C Adsorption and exothermicity are unrelated.
D Adsorption can be either endothermic or exothermic depending on the conditions.

The correct answer is:
Adsorption involves the release of energy, making it exothermic.

Solution:
Correct Option is : (B)
Adsorption involves the release of energy, making it exothermic.

Topic: Chemistry, Surface Chemistry, NEET
Why is amorphous quartz glass different from crystalline quartz?

Options:
A It has a different chemical composition.
B It has no order in its arrangement.
C It is always found in liquid form.
D It has a long-range order.

The correct answer is:
It has no order in its arrangement.

Solution:
Amorphous quartz glass is different from crystalline quartz because it has no order in its arrangement, while crystalline quartz has long-range order, as stated in the paragraph.

Topic: Chemistry, Solid State, NEET
Why is an apple called a false fruit?

Options:
A it is derived from the root
B it is derived from the thalamus
C it is derived from the shoot
D none of the above

The correct answer is:
it is derived from the thalamus

Solution:
Apple is known as false fruit because it is derived from the thalamus

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
Why is an average bond enthalpy used in the context of polyatomic molecules?

Options:
A To simplify calculations
B To account for changes in temperature
C To account for differences in bond length
D To account for variations in bond strength

The correct answer is:
To account for variations in bond strength

Solution:
An average bond enthalpy is used in polyatomic molecules to account for variations in bond strength.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Why is an external emf of more than 2.2 V required for the extraction of Cl2from brine? (Mark the closest option)

Options:
A Value of ∆G⊖is + 422kJ. Using the equation ∆G⊖= – nFE⊖the value of E⊖comes out to be –2.2V. Therefore extraction of Cl2from brine will require an external emf of greater than 2.2V.
B The extraction of Cl2from brine is an endothermic process.
C The extraction of Cl2from brine is a slow reaction.
D The extraction of Cl2from brine is a highly exothermic process.

The correct answer is:
Value of ∆G⊖is + 422kJ. Using the equation ∆G⊖= – nFE⊖the value of E⊖comes out to be –2.2V. Therefore extraction of Cl2from brine will require an external emf of greater than 2.2V.

Solution:
Correct Option is : (A)
Value of ∆G⊖is + 422kJ. Using the equation ∆G⊖= – nFE⊖the value of E⊖comes out to be –2.2V. Therefore extraction of Cl2from brine will require an external emf of greater than 2.2V.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
Why is an ideal gas considered hypothetical?

Options:
A It is extremely rare in nature
B It has a very low boiling point
C It is assumed to have no intermolecular forces between its molecules
D It exists only at very high pressures

The correct answer is:
It is assumed to have no intermolecular forces between its molecules

Solution:
An ideal gas is considered hypothetical because it is assumed to have no intermolecular forces between its molecules.

Topic: Chemistry, States of Matter, NEET
Why is aniline soluble in aqueous HCl?

Options:
A Aniline has a polar structure that allows it to dissolve in polar HCl.
B Aniline forms hydrogen bonds with HCl, increasing its solubility.
C Aniline is a strong base and ionizes in the presence of HCl.
D Aniline forms the salt anilinium chloride which is water soluble.

The correct answer is:
Aniline forms the salt anilinium chloride which is water soluble.

Solution:
Correct Option is : (D)
Aniline forms the salt anilinium chloride which is water soluble.

Topic: Chemistry, Amines, NEET
Why is aspartame not used in hot foods?

Options:
A It loses its sweetness when heated
B It becomes toxic when heated
C It reacts with other food ingredients when heated
D It is unstable and breaks down when heated

The correct answer is:
It is unstable and breaks down when heated

Solution:
Aspartame is not used in hot foods because it is unstable at cooking temperature, implying that it breaks down when heated.

Topic: Chemistry, Chemistry in Everyday Life, NEET
Why is benzene diazonium chloride not stored and is used immediately after its preparation?

Options:
A because benzene diazonium chloride is extremely stable
B because benzene diazonium chloride is very unstable
C because benzene diazonium chloride has more density
D because benzene diazonium chloride is inert

The correct answer is:
because benzene diazonium chloride is very unstable

Solution:
Correct Option is : (B)
because benzene diazonium chloride is very unstable

Topic: Chemistry, Amines, NEET
Why is benzene extra ordinarily stable though it contains three double bonds?

Options:
A Benzene is stable because the three double bonds are actually weaker than typical double bonds, making it less reactive and more stable.
B Benzene is stable because the presence of three double bonds provides it with additional bonding energy, making it highly stable.
C Benzene is stable due to no resonance between the three double bonds, which constantly prevents the formation of delocalized charges.
D Benzene is stable because of resonance of the double bonds in the ring are i.e. a conjugated system, allowing for delocalization of pi electrons, which results in a more stable structure.

The correct answer is:
Benzene is stable because of resonance of the double bonds in the ring are i.e. a conjugated system, allowing for delocalization of pi electrons, which results in a more stable structure.

Solution:
Correct Option is : (D)
Benzene is stable because of resonance of the double bonds in the ring are i.e. a conjugated system, allowing for delocalization of pi electrons, which results in a more stable structure.

Topic: Chemistry, Hydrocarbons, NEET
Why is beryllium (Be) a weaker reducing agent compared to other alkaline earth metals?

Options:
A It has a smaller ionic radius.
B It has a lower atomic number.
C It has a less negative reduction potential.
D It has a higher ionization energy.

The correct answer is:
It has a less negative reduction potential.

Solution:
Beryllium has a less negative reduction potential compared to other alkaline earth metals, indicating it is a weaker reducing agent.

Topic: Chemistry, s Block Elements, NEET
Why is BiH3the strongest reducing agent amongst all the hydrides of Group 15 elements?

Options:
A Due to a decrease in atomic size.
B Due to the high electronegativity of bismuth.
C Due to the lower ionization energy of bismuth.
D Due to the presence of a higher number of unpaired electrons in bismuth.

The correct answer is:
Due to the presence of a higher number of unpaired electrons in bismuth.

Solution:
Correct Option is : (D)
Due to the presence of a higher number of unpaired electrons in bismuth.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Why is biodiversity and its conservation a vital environmental issue of international concern?

Options:
A Biodiversity is important for our survival and well:being on this planet
B Biodiversity is not important
C Biodiversity is important only in certain regions
D Biodiversity is a new environmental issue

The correct answer is:
Biodiversity is important for our survival and well:being on this planet

Solution:
Biodiversity and its conservation is a vital environmental issue of international concern because it is important for our survival and well:being on this planet.

Topic: Biology, Biodiversity and its Conservation, NEET
Why is biodiversity and its conservation important?

Options:
A For aesthetic purposes
B For survival and well:being of humans on the planet
C To provide recreational opportunities
D For commercial purposes

The correct answer is:
For survival and well:being of humans on the planet

Solution:
Biodiversity and its conservation are important for our survival and well:being on this planet as more and more people begin to realise its critical importance.

Topic: Biology, Biodiversity and its Conservation, NEET
Why is biodiversity and its conservation now an environmental issue of international concern?

Options:
A Because of its commercial importance
B Because of its aesthetic importance
C Because of its importance for survival and well:being of humans on the planet
D Because of its recreational importance

The correct answer is:
Because of its importance for survival and well:being of humans on the planet

Solution:
Biodiversity and its conservation are now an environmental issue of international concern as more and more people begin to realise its critical importance for our survival and well:being on this planet.

Topic: Biology, Biodiversity and its Conservation, NEET
Why is boric acid considered a weak acid?

Options:
A Because it is unable to release H⁺ ions on its own.
B Because it readily releases OH⁻ ions in water.
C Because it forms strong covalent bonds with water molecules.
D Because it has a high concentration of H⁺ ions in its structure.

The correct answer is:
Because it is unable to release H⁺ ions on its own.

Solution:
Correct Option is : (A)
Because it is unable to release H⁺ ions on its own.

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

Options:
A Because it readily releases H+ ions
B Because it is highly soluble in water
C Because it has a strong odor
D Because it does not release H+ ions on its own

The correct answer is:
Because it does not release H+ ions on its own

Solution:
Boric acid is considered a weak acid because it does not release H+ ions on its own.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Why is carbon dioxide considered a weak electrophile in electrophilic aromatic substitution?

Options:
A It has a positive charge.
B It has a high electron density.
C It is a strong Lewis base.
D It has a low electron deficiency.

The correct answer is:
It has a low electron deficiency.

Solution:
Carbon dioxide lacks a significant positive charge or electron deficiency, making it a weak electrophile in electrophilic aromatic substitution reactions.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Why is carbon dioxide gas rapidly released from a soda water bottle when it is opened?

Options:
A To increase its temperature
B To decrease its pressure
C To reach a new equilibrium with the lower pressure of the atmosphere
D To decrease its solubility

The correct answer is:
To reach a new equilibrium with the lower pressure of the atmosphere

Solution:
When a soda water bottle is opened, some of the dissolved carbon dioxide gas escapes to reach a new equilibrium with the lower pressure of the atmosphere.

Topic: Chemistry, Chemical Equilibrium, NEET
Why is carbon monoxide (CO) considered highly poisonous?

Options:
A Because it forms a stable complex with haemoglobin
B Because it is highly flammable
C Because it is a strong acid
D Because it is a greenhouse gas

The correct answer is:
Because it forms a stable complex with haemoglobin

Solution:
Carbon monoxide is highly poisonous because it forms a complex with haemoglobin, which is about 300 times more stable than the oxygen-haemoglobin complex, preventing the transport of oxygen in the body and leading to death.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Why is carbon monoxide (CO) poisonous for man?

Options:
A It affects the nerves of the lungs.
B It affects the diaphragm and intercostal muscles.
C It reacts with the oxygen-reducing percentage of oxygen in the air.
D Haemoglobin combines with carbon monoxide instead of oxygen and the product cannot dissociate.

The correct answer is:
Haemoglobin combines with carbon monoxide instead of oxygen and the product cannot dissociate.

Solution:
If a person respires in air containing a normal amount of oxygen (21%) and a small amount of carbon monoxide, he suffers from suffocation because haemoglobin combines with carbon monoxide to form a stable compound. The affinity of haemoglobin to carbon monoxide is about 250 times more than for oxygen. 0.1% of carbon monoxide blocks 50% Hb of the body due to which the oxygen-carrying capacity of blood is decreased. This is called hypoxia.

Topic: Biology, Breathing and Exchange of Gases, NEET
Why is carbon monoxide gas more dangerous than carbon dioxide gas?

Options:
A Because carbon monoxide can cause respiratory problems.
B Because carbon monoxide binds more strongly to hemoglobin, reducing the blood's capacity to carry oxygen.
C Because carbon dioxide is highly flammable.
D Because carbon dioxide is a greenhouse gas.

The correct answer is:
Because carbon monoxide binds more strongly to hemoglobin, reducing the blood's capacity to carry oxygen.

Solution:
Correct Option is : (B)
Because carbon monoxide binds more strongly to hemoglobin, reducing the blood's capacity to carry oxygen.

Topic: Chemistry, Environmental Chemistry, NEET
Why is cement important in construction and infrastructure development?

Options:
A Cement is a primary source of fuel for power generation.
B Cement is used as a food additive in the baking industry.
C Cement is a crucial binding agent in the construction of buildings and roads.
D Cement is used as a cleaning agent in households.

The correct answer is:
Cement is a crucial binding agent in the construction of buildings and roads.

Solution:
Correct Option is : (C)
Cement is a crucial binding agent in the construction of buildings and roads.

Topic: Chemistry, s Block Elements, NEET
Why is chemisorption often referred to as activated adsorption?

Options:
A It involves a high energy of activation.
B It releases a high amount of energy.
C It occurs at low temperatures.
D It is associated with weak forces.

The correct answer is:
It involves a high energy of activation.

Solution:
The paragraph mentions that chemisorption involves a high energy of activation, and therefore, it is often referred to as activated adsorption.

Topic: Chemistry, Surface Chemistry, NEET
Why is chemisorption referred to as activated adsorption?

Options:
A Because it involves the activation of surface sites for chemical bonding.
B Because it is an exothermic process releasing activation energy.
C Because it is a reversible process.
D Because it only occurs at high temperatures.

The correct answer is:
Because it involves the activation of surface sites for chemical bonding.

Solution:
Correct Option is : (A)
Because it involves the activation of surface sites for chemical bonding.

Topic: Chemistry, Surface Chemistry, NEET
Why is chemisorption usually irreversible?

Options:
A It involves compound formation.
B It is an endothermic process.
C It has a low energy of activation.
D It occurs at low temperatures.

The correct answer is:
It involves compound formation.

Solution:
The paragraph states that chemisorption is usually irreversible because it involves compound formation.

Topic: Chemistry, Surface Chemistry, NEET