datavorous/entrance-exam-dataset huggingface dataset:
When aqueous solution of borax is acidified with hydrochloric acid, a white crystalline solid is formed which is soapy to touch. Is this solid acidic or basic in nature? Explain.

Options:
A Acidic, due to release of H+ions
B Basic, due to release of OH-ions
C Basic, due to release of H+ions
D Acidic, due to release of OH-ions

The correct answer is:
Basic, due to release of H+ions

Solution:
Correct Option is : (C)
Basic, due to release of H+ions

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
When are agonists drugs considered useful?

Options:
A When enhancing message transmission is required
B When blocking message transmission is required
C When there is a lack of natural chemical messengers
D When there is an excess of natural chemical messengers

The correct answer is:
When enhancing message transmission is required

Solution:
Agonists are useful when there is a lack of natural chemical messengers, which indicates that they enhance message transmission.

Topic: Chemistry, Chemistry in Everyday Life, NEET
When are antagonists drugs considered useful?

Options:
A When enhancing message transmission is required
B When blocking message transmission is required
C When there is a lack of natural chemical messengers
D When there is an excess of natural chemical messengers

The correct answer is:
When blocking message transmission is required

Solution:
Antagonists are useful when blocking the message is required.

Topic: Chemistry, Chemistry in Everyday Life, NEET
When are common names of organic compounds considered useful and indispensable?

Options:
A When they are shorter than systematic names
B When they are derived from Latin or Greek roots
C When they are based on the compound's properties
D When they are associated with a famous scientist

The correct answer is:
When they are shorter than systematic names

Solution:
Common names are considered useful and indispensable, particularly when the alternative systematic names are lengthy and complicated.

Topic: Chemistry, General Organic Chemistry, NEET
When are low oxidation states found in complex compounds of transition elements?

Options:
A When ligands have 𝛔-bonding character
B When ligands have π-acceptor character
C When ligands have 𝛅-orbital character
D When ligands have f-orbital character

The correct answer is:
When ligands have π-acceptor character

Solution:
Low oxidation states are found when a complex compound has ligands capable of π-acceptor character in addition to the 𝛔-bonding.

Topic: Chemistry, d and f Block Elements, NEET
When are the first movements of the foetus usually observed in human pregnancy?

Options:
A 1st month
B 2nd month
C 5th month
D 24th week (end of second trimester)

The correct answer is:
5th month

Solution:
The first movements of the foetus and appearance of hair on the head are usually observed during the fifth month of pregnancy.

Topic: Biology, Human Reproduction, NEET
When BCl₃ is treated with water, it hydrolyses and forms [B(OH)₄]⁻ only, whereas AlCl₃ in acidified aqueous solution forms [Al(H₂O)₆]³⁺ ion. Explain what is the hybridisation of boron and aluminium in these species?

Options:
A Boron - sp3hybridization, Aluminium - sp³d2hybridization
B Boron - sp² hybridization, Aluminium - sp² hybridization
C Boron - sp³ hybridization, Aluminium - sp² hybridization
D Boron - sp³ hybridization, Aluminium - sp³ hybridization

The correct answer is:
Boron - sp3hybridization, Aluminium - sp³d2hybridization

Solution:
Correct Option is : (A)
Boron - sp3hybridization, Aluminium - sp³d2hybridization

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
When benzaldehyde (or any other aromatic aldehyde) is heated with anhydride of an aliphatic acid (containing two α -hydrogen atoms) in presence of its sodium salt, condensation takes place to form an unsaturated carboxylic acid. This reaction is called

Options:
A Perkin reaction
B Claisen-Schmidt reaction
C Witting reaction
D Benzoin condensation

The correct answer is:
Perkin reaction

Solution:
When benzaldehyde (or any other aromatic aldehyde) is heated with anhydride of an aliphatic acid (containing two α -hydrogen atoms) in presence of its sodium salt, condensation takes place to form an unsaturated carboxylic acid. This reaction is called Perkin reaction.

Topic: Chemistry, Aldehydes and Ketones, NEET
When benzene or its derivative is treated with carbon monoxide and hydrogen chloride in the presence of anhydrous aluminium chloride, it gives

Options:
A Benzaldehyde
B Benzophenone
C Benzyl alcohol
D Benzal chloride

The correct answer is:
Benzaldehyde

Solution:
By Gatterman-Koch reaction- When benzene or its derivative is treated with carbon monoxide and hydrogen chloride in the presence of anhydrous aluminium chloride, it gives benzaldehyde.

Topic: Chemistry, Aldehydes and Ketones, NEET
When benzene sulphonic acid and p-nitrophenol are treated with NaHCO3 , the gases released respectively are

Options:
A SO2,NO2
B SO2,NO
C SO2,CO2
D CO2,CO2

The correct answer is:
CO2,CO2

Solution:
Benzene sulphonic acid and p-nitroohenol react with NaHCO3 and liberate CO2 gas.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
When beryllium (Be) reacts with hydrochloric acid (HCl), what is the product formed?

Options:
A BeCl
B BeCl2
C BeHCl
D Be2Cl

The correct answer is:
BeCl2

Solution:
Beryllium (Be) reacts with hydrochloric acid (HCl) to form beryllium chloride (BeCl2) and hydrogen gas (H2).

Topic: Chemistry, s Block Elements, NEET
When both alleles of a pair are fully expressed in heterozygotes, they are called

Options:
A Lethals
B Codominants
C Incomplete dominants
D Recessive allele.

The correct answer is:
Codominants

Solution:
Co-dominance occurs when multiple alleles are expressed at the same time. An example of co-dominance is blood type. The glycoprotein antigens that make blood types A and B can both be expressed without one overpowering the other. In other words, there is no recessive allele here. We call this blood type AB-both the A allele and B allele are expressed.

Topic: Biology, Principles of Inheritance and Variation, NEET
When both Ia and Ib are present together in an individual, what happens?

Options:
A Only Ia expresses
B Only Ib expresses
C Both Ia and Ib express their own types of sugars
D None of the above

The correct answer is:
Both Ia and Ib express their own types of sugars

Solution:
When both Ia and Ib are present together in an individual, they both express their own types of sugars.

Topic: Biology, Principles of Inheritance and Variation, NEET
When both the listener and source are moving towards each other, then which of the following is true regarding frequency and wavelength of wave observed by the observer?

Options:
A More frequency, less wavelength
B More frequency, more wavelength
C Less frequency, less wavelength
D More frequency, constant wavelength

The correct answer is:
More frequency, less wavelength

Solution:
According to Doppler's effect, whenever there is relative motion between a source of sound and listener, the apparent frequency of sound heard by the listener is different from the actual frequency of sound emitted by the source. Let S be source of sound and L the listener of sound. Let ν be the actual frequency of sound emitted by the source and λ be the actual wavelength of the sound emitted.
If v is velocity of sound in still air, then
λ=vν
If velocity of listener is vLand velocity of source is vs, then apparent frequency of sound waves heard by the listener is
ν'=v-vLv-ss×ν
Here, both source and listener are approaching each other.
Then vs is positive and vL is negative.
∴ν'=v--vLv-vs×ν=v+vLv-vsν
⇒ν'>ν
Also, λ'<λ
So, listener listens more frequency and observes less wavelength.

Topic: Physics, Waves and Sound, NEET
When breast feeding is replaced by less nutritive food low in proteins and calories; the infants below the age of one year are likely to suffer from

Options:
A marasmus
B rickets
C kwashiorkor
D pellagra

The correct answer is:
marasmus

Solution:
Prolonged starvation causes marasmus due to a generalized wasting of body because of both energy and protein deficiency. The body becomes lean and weak, eyes depressed and skin wrinkled.
Kwashiorkor is a disease caused by continued deficiency of proteins in diet although energy intake may be adequate.
Rickets (in children) occurs due to deficiency of vitamin-D.
Pellagra occurs due to deficiency of nicotinamide (vitamin- $\mathrm{B}_5$ ).

Topic: Biology, Digestion and Absorption, NEET, NEET 2009 (Screening)
When breastfeeding is replaced by less nutritive food low in proteins and calories; the infants below the age of one year are likely to suffer from

Options:
A Marasmus
B Rickets
C Kwashiorkor
D Pellagra

The correct answer is:
Marasmus

Solution:
Marasmus is a nutrient deficiency disease in infants below 1 year of age that occurs when sufficient mother's milk is not given to the child. Prolonged starvation causes marasmus due to a generalized wasting of the body because of both energy and protein deficiency. The body becomes lean and weak, eyes depressed and skin wrinkled. Kwashiorkor is a disease caused by continued deficiency of proteins in diet although energy intake may be adequate. Rickets (in children) occurs due to deficiency of vitamin-D. Pellagra occurs due to deficiency of nicotinamide (vitamin-B3).

Topic: Biology, Digestion and Absorption, NEET
When bromoethane is subjected to Wurtz reaction, the hydrocarbon mixture so obtained consist of

Options:
A butane only
B butane and ethane
C butane and ethene
D butane, ethane and ethene

The correct answer is:
butane only

Solution:
Two mechanisms for Wurtz reaction are
(i) C2H5Br+2Na→C2H5-Na++NaBr
C2H5-Na++C2H5Br→C2H5-C2H5+NaBr
(ii) C2H5Br+Na→C2⋅H5+NaBr
C2⋅H5+C2⋅H5→C2H5-C2H5

Topic: Chemistry, Hydrocarbons, NEET
When CH2=CH-COOH is reduced with LiAlH4, the compound obtained will be

Options:
A CH3-CH2-COOH
B CH2=CH-CH2OH
C CH3-CH2-CH2OH
D CH3-CH2-CHO

The correct answer is:
CH2=CH-CH2OH

Solution:
CH2=CH-COOHâLiAlH4 CH2=CH-CH2OH+H2O
LiAlH4 cannot reduce C = C in ether.

Topic: Chemistry, Carboxylic Acid Derivatives, NEET
When CO2 is passed through brine solution, saturated with ammonia, white crystals precipitate out these crystals are of

Options:
A NH4HCO3
B NH4Cl
C Na2CO3
D NaHCO3

The correct answer is:
NaHCO3

Solution:
White crystals precipitate out these crystals are of NaHCO3 and the reaction is as follows
NH3+H2O+CO2→NH4HCO3
NH4HCO3+NaCl→NaHCO3↓+NH4Cl

Topic: Chemistry, s Block Elements, NEET
When CuSO4 is electrolysed using platinum electrodes,

Options:
A copper is liberated at cathode, sulphur at anode
B copper is liberated at cathode, oxygen at anode
C sulphur is liberated at cathode, oxygen at anode
D oxygen is liberated at cathode, copper at anode

The correct answer is:
copper is liberated at cathode, oxygen at anode

Solution:
CuSO 4 ⇌ Cu 2+ + SO 4 2−
H 2 O⇌ H + + OH −
At cathode: Cu2++2e-âCu
At anode: 4OH-â2H2O+O2+4e-

Topic: Chemistry, d and f Block Elements, NEET
When calculating atomic masses for elements, what type of atomic masses do scientists actually use?

Options:
A Isotopic atomic masses
B Relative atomic masses
C Average atomic masses
D Exact atomic masses

The correct answer is:
Average atomic masses

Solution:
When using atomic masses of elements in calculations, scientists actually use average atomic masses of elements.

Topic: Chemistry, Some Basic Concepts of Chemistry, NEET
When can a vacancy defect develop in a substance, according to the passage?

Options:
A When the substance is cooled
B When the substance is heated
C When the substance is compressed
D When the substance is exposed to light

The correct answer is:
When the substance is heated

Solution:
According to the passage, a vacancy defect can develop in a substance when the substance is heated.

Topic: Chemistry, Solid State, NEET
When can electrodialysis be applied effectively?

Options:
A When the colloidal solution is impure
B When the dissolved substance is not an electrolyte
C When the colloidal solution is pure
D When the dissolved substance is a gas

The correct answer is:
When the colloidal solution is impure

Solution:
Electrodialysis can be applied effectively when the colloidal solution is impure and the dissolved substance is an electrolyte.

Topic: Chemistry, Surface Chemistry, NEET
When can liquid and gas be distinguished from each other?

Options:
A At any temperature
B When the fluid is below its critical temperature and pressure
C When the fluid is above its critical temperature and pressure
D When the fluid is in a vacuum

The correct answer is:
When the fluid is below its critical temperature and pressure

Solution:
Liquid and gas can be distinguished from each other when the fluid is below its critical temperature, and its pressure and volume lie under the dome, where liquid and gas are in equilibrium.

Topic: Chemistry, States of Matter, NEET
When can multiple alleles be found?

Options:
A When two alleles are present in an individual
B When population studies are made
C When a single gene product produces more than one effect
D When dominance is an autonomous feature of a gene

The correct answer is:
When population studies are made

Solution:
Multiple alleles can be found when population studies are made.

Topic: Biology, Principles of Inheritance and Variation, NEET
When $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CHCl}_2$ is treated with $\mathrm{NaNH}_2$, the product formed is:

Options:
A $\mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}_2$
B $\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{CH}$
C

D

The correct answer is:
$\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{CH}$

Solution:

Topic: Chemistry, Hydrocarbons, NEET, NEET 2002
When chlorine water is added to a solution of KBr, the solution immediately turns orange red, because

Options:
A chlorine is reduced to chloride ion
B of the formation of BrCl
C bromide ion is oxidized to bromine
D of the formation of Br3-

The correct answer is:
of the formation of BrCl

Solution:
When chlorine water is added to a solution of KBr, the solution immediately turns orange red, because of the formation of BrCl.
2KBr+Cl2→2KCl+Br2
Br2+Cl2→2BrCl

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
When $\mathrm{Cl}_2$ gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from

Options:
A zero to +1 and zero to -5
B zero to -1 and zero to +5
C zero to -1 and zero to +3
D zero to +1 and zero to -3

The correct answer is:
zero to -1 and zero to +5

Solution:
When chlorine gas reacts with hot and concentrated $\mathrm{NaOH}$ solution, it disproportionates into chloride $\left(\mathrm{Cl}^{-}\right)$and chlorate $\left(\mathrm{ClO}_3^{-}\right)$ions.
In this process, oxidation number of chlorine changes from 0 to -1 and 0 to +5 .
Note In disproportionation reactions, the same element undergoes oxidation as well as reduction.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET, NEET 2012 (Screening)
When closely placed genes on the same chromosome are inherited together the phenomenon is known as:

Options:
A linkage.
B crossing over.
C gene interaction.
D multiple allelism.

The correct answer is:
linkage.

Solution:
Alleles that are located close together on a chromosome have a tendency to be inherited together as they are less likely to undergo separation during chromosomal crossover in meiosis. Such alleles or genes are said to be genetically linked. The theory of linkage was given by T.H. Morgan who used the Drosophila as subject for inheritance studies. His work disproved the Mendel law of independent assortment.

Topic: Biology, Principles of Inheritance and Variation, NEET
When $\mathrm{CO}_2$ concentration in blood increases breathing becomes:

Options:
A shallower and slow
B there is no effect on breathing
C slow and deep
D faster and deeper.

The correct answer is:
faster and deeper.

Solution:
When $\mathrm{CO}_2$ concentration in blood increases breathing becomes faster and deeper. The effect of increased $\mathrm{CO}_2$ is to decrease the affinity of haemoglobin for $\mathrm{O}_2$. Thus, due to Bohr's effect the $\mathrm{CO}_2$ released in respiring tissue accelerates the delivery of oxygen by faster and deeper breathing.
Related Theory
Bohr and Haldane's effect are two properties of haemoglobin. They help the dissociation of respiratory gases from the haemoglobin molecule based on the physiological conditions of their final destination. Bohr effect is the decrease of the oxygen binding capacity of haemoglobin with the increase of the concentration of carbon dioxide or decrease in $\mathrm{pH}$ whereas Haldane effect is the decrease of the carbon dioxide binding capacity of haemoglobin with the rise in the concentration of oxygen. Furthermore, Bohr effect aids in the release of oxygen from oxyhaemoglobin at the metabolizing tissues while Haldane effect aids in the release of carbon dioxide from carboxyhaemoglobin in the lungs.

Topic: Biology, Breathing and Exchange of Gases, NEET, NEET 2004
When comparing elements in the same group of the periodic table, what factor is more important in determining acidity than its polar nature?

Options:
A Electronegativity
B Atomic number
C H-A bond polarity
D H-A bond strength

The correct answer is:
H-A bond strength

Solution:
When comparing elements in the same group of the periodic table, the strength of the H-A bond (H-A bond strength) is a more important factor in determining acidity than its polar nature.

Topic: Chemistry, Ionic Equilibrium, NEET
When comparing elements in the same row of the periodic table, what factor becomes the deciding factor for determining acid strength?

Options:
A Atomic number
B H-A bond strength
C H-A bond polarity
D Electronegativity of A

The correct answer is:
Electronegativity of A

Solution:
When comparing elements in the same row of the periodic table, the electronegativity of atom A (electronegativity of

Topic: Chemistry, Ionic Equilibrium, NEET
When concentrated sulphuric acid is added to an alkene under cold conditions, which product is formed in accordance with the Markovnikov rule?

Options:
A Alkyl hydrogen sulfide
B Alkyl hydrogen sulfate
C Alkyl sulfide
D Alkyl sulfate

The correct answer is:
Alkyl hydrogen sulfate

Solution:
Concentrated sulphuric acid, when added to an alkene under cold conditions, follows the Markovnikov rule and forms alkyl hydrogen sulfate through electrophilic addition.

Topic: Chemistry, Hydrocarbons, NEET
When concentrated sulphuric acid is added to an inorganic mixture containing chloride, we get colourless pungent smelling gas HCl, but if the mixture contains bromide then we get red vapour of bromine. Why?

Options:
A Bromine has a higher boiling point than chlorine.
B Sulfuric acid reacts more vigorously with bromide than with chloride.
C Bromine is more volatile than chlorine.
D The red color is a result of a chemical reaction between sulfuric acid and bromide.

The correct answer is:
Bromine is more volatile than chlorine.

Solution:
Correct Option is : (C)
Bromine is more volatile than chlorine.

Topic: Chemistry, Redox Reactions, NEET
When considering the basicity of amines, which effect is related to the interaction between the amine and solvent molecules?

Options:
A Inductive effect
B Electronegative effect
C Solvation effect
D Steric effect

The correct answer is:
Solvation effect

Solution:
Solvation effect refers to the interaction between the amine and solvent molecules, which can affect the basicity of amines.

Topic: Chemistry, Amines, NEET
When copper is heated with conc. HNO3 it produces:

Options:
A CuNO32 and NO2
B CuNO32 and NO
C CuNO32,NO and NO2
D CuNO32 and N2O

The correct answer is:
CuNO32 and NO2

Solution:
Cu+4HNO3→CuNO32+2NO2+O2

In the given reaction, Copper nitrate is deep blue in colour.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET, NEET 2016 (Phase 1)
When copper nitrate is strongly heated the compound obtained is:

Options:
A Copper nitrite
B Copper
C Copper nitride
D Copper oxide

The correct answer is:
Copper oxide

Solution:
2 Cu NO 3 2 → Δ 2 CuO+4  NO 2 + O 2

Topic: Chemistry, d and f Block Elements, NEET
When could the first non:cellular forms of life have originated?

Options:
A 2 billion years ago
B 3 billion years ago
C 4 billion years ago
D 4.5 billion years ago

The correct answer is:
3 billion years ago

Solution:
The first non:cellular forms of life could have originated 3 billion years back.

Topic: Biology, Evolution, NEET
When Cu2+ion is treated with KI, a white precipitate is formed. Explain the reaction with the help of a chemical equation.

Options:
A Cu2++ 2KI → CuI2+ 2K+
B Cu2++ 2KI → CuI + 2K+
C Cu2++ 2KI → CuI2+ 2KI+
D Cu2++ 2KI → CuI + 2K+

The correct answer is:
Cu2++ 2KI → CuI + 2K+

Solution:
Correct Option is : (B)
Cu2++ 2KI → CuI + 2K+

Topic: Chemistry, d and f Block Elements, NEET
When $\mathrm{CuSO}_4$ reacts with $\mathrm{KCN}$ it forms $\mathrm{CuCN}$, which is insoluble in water. It is soluble in excess of $\mathrm{KCN}$ due to the formation of the following complex:

Options:
A $\mathrm{K}_2\left[\mathrm{Cu}(\mathrm{CN})_4\right]$
B $\mathrm{K}_3\left[\mathrm{Cu}(\mathrm{CN})_4\right]$
C $\mathrm{CuCN}_2$
D $\mathrm{Cu}\left[\mathrm{KCu}(\mathrm{CN})_4\right]$

The correct answer is:
$\mathrm{K}_3\left[\mathrm{Cu}(\mathrm{CN})_4\right]$

Solution:
$\mathrm{CuSO}_4$ reacts with $\mathrm{KCN}$ to give a white precipitate of cuprous cyanide and cyanogen gas. The cuprous cyanide dissolves in excess of $\mathrm{KCN}$ forming $\mathrm{K}_3\left[\mathrm{Cu}(\mathrm{CN})_4\right]$
$\begin{gathered}
\mathrm{CuSO}_4+2 \mathrm{KCN} \rightarrow \mathrm{K}_2 \mathrm{SO}_4+ \mathrm{Cu}(\mathrm{CN})_2 \\
2 \mathrm{Cu}(\mathrm{CN})_2 \rightarrow 2 \mathrm{CuCN}+\mathrm{CN}-\mathrm{CN} \\
\mathrm{CuCN}+3 \mathrm{KCN} \rightarrow \mathrm{K}_3\left[\mathrm{Cu}(\mathrm{CN})_4\right]
\end{gathered}$

Topic: Chemistry, d and f Block Elements, NEET, NEET 2002
When determining the instantaneous rate, at what time is the tangent typically drawn on the concentration curve?

Options:
A At the beginning of the reaction
B At the end of the reaction
C At any arbitrary time during the reaction
D At a specific time of interest, such as t = 600 s

The correct answer is:
At a specific time of interest, such as t = 600 s

Solution:
When determining the instantaneous rate, a tangent is typically drawn at a specific time of interest, such as t = 600 s, on the concentration curve.

Topic: Chemistry, Chemical Kinetics, NEET
When did agriculture start?

Options:
A 18,000 years ago
B 10,000 years ago
C 75,000-10,000 years ago
D 1,00,000-40,000 years ago

The correct answer is:
10,000 years ago

Solution:
Agriculture came around 10,000 years back.

Topic: Biology, Evolution, NEET
When did Alfonso Corti die?

Options:
A 1822
B 1888
C 1851
D 1751

The correct answer is:
1888

Solution:
Alfonso Corti died in 1888. He was an Italian anatomist who discovered the organ of Corti, a structure located on the basilar membrane of the cochlea that contains hair cells that convert sound vibrations into nerve impulses.

Topic: Biology, Digestion and Absorption, NEET
When did life appear on Earth?

Options:
A 2 billion years ago
B 3 billion years ago
C 4 billion years ago
D 500 million years after the formation of Earth

The correct answer is:
500 million years after the formation of Earth

Solution:
Life appeared 500 million years after the formation of Earth, i.e., almost four billion years back.

Topic: Biology, Evolution, NEET
When did local women show enormous bravery in protecting trees from the axe of contractors by hugging them?

Options:
A In 1731
B In 1974
C In 1980s
D None of the above

The correct answer is:
In 1974

Solution:
In 1974, local women showed enormous bravery in protecting trees from the axe of contractors by hugging them.

Topic: Biology, Environmental Issues, NEET
When did protein-energy malnutrition (PEM) occur in Bangladesh?

Options:
A During a drought in the mid-eighties
B During a famine in the mid-nineties
C During the liberation war
D During a natural disaster in the late seventies

The correct answer is:
During the liberation war

Solution:
PEM happened in Bangladesh during the liberation war.

Topic: Biology, Digestion and Absorption, NEET