datavorous/entrance-exam-dataset huggingface dataset:
Which of the following was the transitional stage between apes and humans?

Options:
A Homo habilis
B Homo erectus
C Australopithecus ramidus
D Australopithecus africanus

The correct answer is:
Australopithecus ramidus

Solution:
Australopithecus ramidus is the most ape-like hominid ancestor and is considered to be missing link between hominids and apes.

Topic: Biology, Evolution, NEET
Which of the following weighs the least?

Options:
A 24 g of Mg
B 0.9 mol of NO
C 22.4 of N2
D 6.02×1024 molecules of oxygen

The correct answer is:
24 g of Mg

Solution:
B. 0.9 mol NO = 0.9 mol Ã30 g mol-1=27 g NO
C. 22.4 L of N2=1 mol N2=28 g N2
D. 6.02Ã1024 molecules of oxygen = 10 mol oxygen
=10Ã32 g=320 g of O2
Hence, here the least weight is of Mg.

Topic: Chemistry, Some Basic Concepts of Chemistry, NEET
Which of the following, when doped into a crystal of ultrapurified germanium, will convert it into a p-type semiconductor?

Options:
A C
B As
C In
D Na

The correct answer is:
In

Solution:
When In is doped into a crystal of ultrapurified germanium, it will convert germanium into a p-type semiconductor as a positive hole is created. p-type conduction is due to presence of positive hole.

Topic: Chemistry, Solid State, NEET
Which of the following will be done with a product formed by rDNA technology?

Options:
A Product has to be formulated with suitable preservation.
B Formulation has to undergo clinical trials.
C Strict quality control testing is done.
D All the above

The correct answer is:
All the above

Solution:
After obtaining product formed, rDNA downstreaming process is carried out which includes separation and purification. The product thus isolated is formulated with suitable preservatives followed by clinical trials and strict quality testing.

Topic: Biology, Biotechnology - Principles and Processes, NEET
Which of the following will be least adversely affected by predation?

Options:
A Grass
B Rabbit
C Deer
D Lion

The correct answer is:
Lion

Solution:
In an ecosystem plants are severely affected by predation because unlike animals they cannot run away from their predators. Herbivores like deer and rabbits are also effected by predation but top carnivores are least affected by predation as their natural predators are absent.

Topic: Biology, Organisms and Populations, NEET
Which of the following will be most stable diazonium salt RN2+X- ?

Options:
A CH3N2+X-
B C6H5N2+X-
C CH3CH2N2+X-
D C6H5CH2N2+X-

The correct answer is:
C6H5N2+X-

Solution:
Benzene diazonium chloride is most stable due to conjugation.

Among the given diazonium salts, benzene diazonium halide C6H5N2+X- is most stable due to conjugation of the N,N triple bond with benzene ring.

Aromatic diazonium salts such that Benzene Diazonium Halide are more stable than aliphatic diazonium salts due to dispersion of positive charge over the benzene ring caused by resonance. This is not found in aliphatic diazonium salts.

Topic: Chemistry, General Organic Chemistry, NEET, NEET 2014
Which of the following will be most stable diazonium salt RN2+X- ?

Options:
A CH3CH2N2+X-
B C6H5N2+X-
C C6H5CH2N2+X-
D CH3N2+X-

The correct answer is:
C6H5N2+X-

Solution:
Primary aliphatic amines form highly unstable alkyl diazonium salts. Primary aromatic amines form arene diazonium salts which are stable for a short time in solution at low temperature (273 – 278 K). The stability of arene diazonium can be explained on the basis of resonance.

Topic: Chemistry, Amines, NEET
Which of the following will be the major product when 3-phenylpropene reacts with HBr?

Options:
A C6H5CH2CHBrCH3
B C6H5CHBrCHCH2
C C6H5CH2CH2CH2Br
D C6H5CHBrCH2CH3

The correct answer is:
C6H5CHBrCH2CH3

Solution:

Topic: Chemistry, Hydrocarbons, NEET
Which of the following will be the major product when 3-phenylpropene reacts with HBr?

Options:
A C6H5CH2CHBrCH3
B C6H5CHBrCH2CH3
C C6H5CH2CH2CH2Br
D C6H5CHBrCHCH2

The correct answer is:
C6H5CHBrCH2CH3

Solution:

Topic: Chemistry, Hydrocarbons, NEET
Which of the following will be the most stable diazonium salt (RN2+X-) ?

Options:
A CH3N2+X-
B C6H5N2+X-
C CH3CH2N2+X-
D C6H5CH2N2+X-

The correct answer is:
C6H5N2+X-

Solution:
Out of the given diazonium salts, C6H5N2+X- is resonance stabilised hence most stable.

Topic: Chemistry, Amines, NEET
Which of the following will be used to determine whether the organism is homozygous or heterozygous for a character?

Options:
A back cross
B test cross
C reciprocal cross
D dihybrid cross

The correct answer is:
test cross

Solution:
Test cross is a process to examine and identify whether the organism is heterozygous or not. In it, the organisms is crossed with the recessive homozygous as it will ensure the expression of the dominant character in heterozygous form for F1 generation enabling us to know the zygosity.

Topic: Biology, Principles of Inheritance and Variation, NEET
Which of the following will decay faster?

Options:
A Sapwood
B Softwood
C Wood with lot of fibres
D Heartwood

The correct answer is:
Sapwood

Solution:
Sapwood is less durable because it is susceptible to attack by pathogens and insects. It is physiologically active and the conduction of water takes place through it. Heartwood is not attacked by pathogens and insects as it is physiologically inactive. It is filled with tannins, resins, and gums which are not preferred by insects and pathogens.

Topic: Biology, Anatomy of Flowering Plants, NEET
Which of the following will exhibit geometrical isomerism?

Options:
A Propene
B Butene-2
C Butene-1
D 1, 1-dichloro butane

The correct answer is:
Butene-2

Solution:
Butane-2 exhibit geometrical (cis, trans) isomerism.

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following will fail to check the problem of the population explosion?

Options:
A Acquiring one child norm.
B Decreasing the marriageable age.
C Use of contraceptive methods.
D Providing education to the people.

The correct answer is:
Decreasing the marriageable age.

Solution:
Government has taken various measures to check the increasing population :
1. To motivate smaller families to use various contraceptive methods (most important step).
2. Many couples have adopted an 'one child norm'.
3. Marriageable age of the female is increased to 18 years and that of males is increased to 21 years.
4. Incentives are given to the couples with small families.

Topic: Biology, Reproductive Health, NEET
Which of the following will form β -amino alcohol with ethylene oxide?

Options:
A HOH/H⊕
B NH3
C (CH3)2CuLi
D CH3MgBr

The correct answer is:
NH3

Solution:
Ethylene oxide on reaction with ammonia gives β -amino alcohol as follows

Topic: Chemistry, Biomolecules, NEET
Which of the following will give a pair of enantiomers?

Options:
A $\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_6\right]\left[\mathrm{Co}(\mathrm{CN})_6\right]$
B $\left[\mathrm{Co}(e n)_2 \mathrm{Cl}_2\right] \mathrm{Cl}$
C $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_4\right]\left[\mathrm{PtCl}_6\right]$
D $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right] \mathrm{NO}_2$

The correct answer is:
$\left[\mathrm{Co}(e n)_2 \mathrm{Cl}_2\right] \mathrm{Cl}$

Solution:
$\left[\mathrm{Co}(e n)_2 \mathrm{Cl}_2\right] \mathrm{Cl}$

Topic: Chemistry, Coordination Compounds, NEET, NEET 2007
Which of the following will have highest bond energy?

Options:
A F2
B N2
C F2-
D O2-

The correct answer is:
N2

Solution:
F2=σ1s2σ*1s2,σ2s2,σ*2s2,σ2pz2,π2px2,π2py2,π*2px2,π*2py2
F2-=σ1s2σ*1s2,σ2s2,σ*2s2,σ2pz2,π2px2,π2py2,π*2px2,π*2py2σ*2pz1
O2-=σ1s2σ*1s2,σ2s2,σ*2s2,σ2pz2,π2px2,π2py2,π*2px2,π*2py1
N2=σ1s2σ*1s2,σ2s2,σ*2s2,π2px2,π2py2,σ2pz2
B.O. of N2=10-42=3
O2-=10-72=1.5
F2=10-82=1
F2-=10-92=0.5
Since, B.O. ∝ B.E.
So bond energy of N2 is maximum.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following will have the most negative electron gain enthalpy and which the least negative among P, S, Cl, F?

Options:
A Most negative: F, Least negative: P
B Most negative: Cl, Least negative: P
C Most negative: S, Least negative: P
D Most negative: F, Least negative: Cl

The correct answer is:
Most negative: Cl, Least negative: P

Solution:
Correct Option is : (B)
Most negative: Cl, Least negative: P

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which of the following will inactivate the process of catalysis in the catalytic converters fitted in automobiles?

Options:
A Running very fast
B Use of leaded petrol
C Using BS IV fuel
D Use of low sulphur fuel

The correct answer is:
Use of leaded petrol

Solution:
Catalytic converters are fitted with metals like platinum, palladium and rhodium, which converts unburnt hydrocarbon into CO2 and H2O and CO and NO2 into CO2 and N2. Presence of lead in the petrol form a covering thus inactivates the catalyst.

Topic: Biology, Environmental Issues, NEET
Which of the following will not be soluble in sodium hydrogen carbonate?

Options:
A 2, 4, 6- trinitrophenol
B Benzoic acid
C O- Nitrophenol
D Benzenesulphonic acid

The correct answer is:
O- Nitrophenol

Solution:
Acids stronger than H2CO3 give CO2 gas with sodium hydrogen carbonate and also soluble in it.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET, NEET 2014
Which of the following will not be soluble in sodium hydrogen carbonate?

Options:
A Benzenesulphonic acid
B Benzoic acid
C o-Nitrophenol
D 2, 4, 6-trinitrophenol

The correct answer is:
o-Nitrophenol

Solution:
2.4.6-Trinitro phenol, benzoic acid and benzene sulphonic acid are sobuble in NaHO3 .
Acid+NaHCO3→salt+H2CO3
Reaction is possible in forward direction if acid is more acidic then H2CO3.
O-nitrophenol is less acidic than H2CO3 so it is not soluble in sodium hydrogen carbonate.
H2CO3 is more acidic then and reaction proceed in strong acid to weak acid so, above reaction is not feasible forward direction

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following will not cause hallucinations at high doses?

Options:
A Coke
B Barbiturates
C Datura extract
D Extract of Atropa belladona

The correct answer is:
Barbiturates

Solution:
Hallucinations mean perception of an image or sound in absence of its actual stimuli. Various drugs that have a stimulatory effect on the central nervous system can result in hallucinations. These include cocaine commonly known as coke or crack, Datura extract, an extract of Atropa belladonna plants etc.
These drugs act as depressants & suppress the activities of the central nervous system. They give a feeling of calmness, relaxation or drowsiness in the body. Their higher doses induce sleep. Tranquillisers lower tension and anxiety without inducing sleep. Examples : Barbiturates, phenathiazine and benzodiazephines (e.g., Valium).

Topic: Biology, Human Health and Diseases, NEET
Which of the following will not form Grignard reagent with Mg/dry ether?

Select the correct answer using the codes given below

Options:
A Only (4)
B Only (2)
C 1, 2 and 3
D 1, 2, 3 and 4

The correct answer is:
1, 2 and 3

Solution:
All these are vicinal dihalide and do not form Grignard reagent as a vic dihalide gives elimination reaction with Mg.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which of the following will not form iodoform with I 2 / O − H ?

Options:
A Ethanol
B Ethanal
C Isopropyl alcohol
D Benzyl alcohol

The correct answer is:
Benzyl alcohol

Solution:
Iodoform reaction is not given by benzyl alcohol because it has no group while rest other alcohols can show it as they have this required group.
For e.g., and CH3-CHO .

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following will not form when NaHCO3 solution is added to aqueous FeCl3 solution?

Options:
A CO2
B Fe(OH)3
C Fe(HCO3)3
D NaCl

The correct answer is:
Fe(HCO3)3

Solution:
FeCl3+NaHCO3→Fe(OH)3+CO2+NaCl

Topic: Chemistry, s Block Elements, NEET
Which of the following will not show deflection from the path on passing through an electric field?

Options:
A Proton
B Cathode rays
C Electron
D Neutron

The correct answer is:
Neutron

Solution:
Correct Option is : (D)
Neutron

Topic: Chemistry, Structure of Atom, NEET
Which of the following will not show geometrical isomerism?

Options:
A Coox33-
B Coen2Cl2Cl
C CrNH34Cl2Cl
D Both Coen2Cl2Cl and CrNH34Cl2Cl

The correct answer is:
Coox33-

Solution:
Coox33- does not show geometrical isomerism.
As all three symmetrical bidentate ligands bonded to central Co3+ cation.

Topic: Chemistry, Coordination Compounds, NEET
Which of the following will not undergo aldol condensation

Options:
A Acetaldehyde
B Propanaldehyde
C Benzaldehyde
D Trideuteroacetaldehyde

The correct answer is:
Benzaldehyde

Solution:
Aldol condensations not observed if the molecule does not contain α- Hydrogen, benzaldehyde do not contain α- Hydrogen.

Topic: Chemistry, Aldehydes and Ketones, NEET
Which of the following will NOT undergo SN1 reaction with OH-?

Options:
A CH2=CH-CH2Cl
B CH33CCl
C
D

The correct answer is:

Solution:
Reactivity in case of SN1 reaction depends upon formation of carbocation. Allyl and benzyl carbocations are stabilised by resonance. Tertiary carbocation is more stable than primary carbocation.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET, NEET 2020 (Phase 2)
Which of the following will occur if lysosomes within a cell are damaged?

Options:
A The cell would produce more proteins than it needs.
B The cell would have chloroplasts that appear yellow rather than green.
C The ability of the cell to break down molecules in its cytoplasm would decrease.
D The ability of the cell to regulate the amount of fluid in its cytoplasm would decrease.

The correct answer is:
The ability of the cell to break down molecules in its cytoplasm would decrease.

Solution:
Lysosomes are organelles derived from Golgi who are very rich in almost all types of hydrolytic enzymes (hydrolases - lipases, proteases, carbohydrases). These enzymes have the capacity to digest carbohydrates, proteins, lipids and nucleic acids. Malfunction of this organelle will hamper the ability to breakdown complex molecules in the cytoplasm.

Topic: Biology, Cell - The Unit of Life, NEET
Which of the following will occur in the vertebrate host with respect to Plasmodium?

a Formation of the motile zygote
b Maturation of gametocytes
c Formation of sporozoites
d Release of hemozoin
e Recurrent fever

Options:
A a, c, d
B a, b, c, d, e
C b, d and e
D d and e only

The correct answer is:
d and e only

Solution:
Plasmodium causes malaria. It requires two host: Man and mosquito to complete its cycle. . Sporozoites are infectious agents of malarial parasites. When female mosquito bites the human, these enter the blood stream. Inside the body these have an Erythrocytic and Exoerythrocytic cycle. When in human body, the infectious agent undergoes many developmental stages (Asexual reproduction). It also produces toxin known as haemozoin inside the body and this is responsible for various symptoms like fever, chills etc. When healthy mosquito bites such an infected human, these agents enter the mosquitoe's body and starts its sexual reproduction which transforms into various forms and reside in the salivary gland. This healthy mosquito is now an infected one and if this again bites any human, the same cycle continues.

Topic: Biology, Human Health and Diseases, NEET
Which of the following will produce adenosine triphosphate by substrate-level phosphorylation?

Options:
A 2-phosphoglycerate to 2-phosphoenol pyruvate
B Glucose to Glucose-6-phosphate
C Phosphoenol pyruvic acid to pyruvic acid
D Frutose 1, 6-biphosphate to PGAL and DHAP

The correct answer is:
Phosphoenol pyruvic acid to pyruvic acid

Solution:
Glycolysis is a process that breaks down glucose to 3C- compound pyruvic acid. In the step to convert phosphoenolpyruvate to pyruvate, ATP is released. This step gives out energy in the form of ATP.

Topic: Biology, Respiration in Plants, NEET
Which of the following will produce only one product on reduction with LiAlH4 ?

Options:
A CH3COOC2H5
B CH 3 COOCH 2 CH 2 CH 3
C CH 3 CH 2 COOCH 2 CH 3
D CH 3 CH 2 COOCH 3

The correct answer is:
CH3COOC2H5

Solution:
LiAlH4 in ether reduces ethyl acetate into ethyl alcohol.
CH 3 COOC 2 H 5 +4[H] → LiAlH 4 2  CH 3 CH 2 OH

Topic: Chemistry, Carboxylic Acid Derivatives, NEET
Which of the following will produce only one product on reduction with LiAlH4?

Options:
A CH3COOCH2CH3
B CH3CH2OCOCH2CH3
C CH 3 CH 2 CH 2 OCOCH 3
D CH3CH2OCOCH2CH2CH3

The correct answer is:
CH3COOCH2CH3

Solution:
This ester undergoes reduction with LiAlH4 to give only ethyl alcohol, other esters given in option on reduction gives a mixture of alcohols.
CH 3 COOCH 2 CH 3 +4 H â LiAlH 4 ether 2 CH 3 CH 2 OH

Topic: Chemistry, Carboxylic Acid Derivatives, NEET
Which of the following will react most vigorously with water?

Options:
A Li
B Na
C K
D Rb

The correct answer is:
Rb

Solution:
The alkali metals react with H2O to form MOH and H2(g) is evolved.
M+HOH→MOH+12H2(g)
The reactivity with water increases in the order
Li < Na < K < Rb < Cs

Topic: Chemistry, s Block Elements, NEET
Which of the following will reduce Tollen's reagent ?

Options:
A
B
C Both of them are correct
D None of these

The correct answer is:

Solution:
Structure
will be reducing sugar as both monosachharide units are not linked through their reducing centres. In structure
, the two monosaccharide units are linked through their reducing centres hence it will be non-reducing.

Topic: Chemistry, Biomolecules, NEET
Which of the following will relate to vertical distribution of different species occupying different levels of ecosystem?

Options:
A Physiognomy
B Pyramid of numbers
C Stratification
D Succession

The correct answer is:
Stratification

Solution:
Biotic and abiotic components interact and form a physical structure which is unique for each type of ecosystem. Vertical distribution of different species occupying different levels is called stratification. For example, trees occupy top layer of a forest, smaller plants the second and weeds and grasses occupy the bottom layers. Pyramid of numbers provide information regarding the relationship between organisms at each trophic level in a ecosystem.

Topic: Biology, Ecosystem, NEET
Which of the following will result in cultural eutrophication?

Options:
A It is the natural aging of a lake by nutrient enrichment of its water.
B It is caused due to pollutants arising as a result of human activities like effluents from the industries and homes.
C It is caused due to the release of organic nutrients
D It is caused due to the release of heated effluents.

The correct answer is:
It is caused due to pollutants arising as a result of human activities like effluents from the industries and homes.

Solution:
Pollutants from man’s activities like effluents from the industries and homes can radically accelerate the aging process. This phenomenon has been called cultural or accelerated eutrophication. During the past century, lakes in many parts of the earth have been severely eutrophied by sewage and agricultural and industrial wastes. The prime contaminants are nitrates
and phosphates, which act as plant nutrients.

Topic: Biology, Environmental Issues, NEET
Which of the following will shift the oxy-haemoglobin dissociation curve to right?

Options:
A Increased CO2
B Decreased acidity
C Increased pH
D Decreased temperature.

The correct answer is:
Increased CO2

Solution:
Oxygen dissociation curve
When percentage saturation of haemoglobin with O2 is plotted against the pO2, a sigmoid curve is obtained which is termed as Oxygen dissociation curve. Utility: This curve is highly useful in studying the effects of various factors (like pCO2, H+ concentration, etc.) on the binding of O2 with haemoglobin. Factors that are favourable in the tissues for the dissociation of oxyhaemoglobin shifting the curve towards the right: Low pO2, high pCO2, greater H+ concentration and higher temperature

Topic: Biology, Respiration in Plants, NEET
Which of the following will violates Aufbau principle as well as Pauli's exclusion principle?

Options:
A
B
C
D None of the above

The correct answer is:

Solution:
Order of electron filling is
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 .......
It should be 1s2 2s2 2p1
In this case 2p started filling before 2s, violating aufbau’s principle.
In 2 p x two electrons have parallel spin. This violates pauli’s exclusion principle.

Topic: Chemistry, Structure of Atom, NEET
Which of the following would be the best (most reactive) nucleophile in the polar medium?

Options:
A Iâ
B Br–
C Cl–
D F–

The correct answer is:
I–

Solution:
A polar protic solvent can participate in hydrogen bonding with a nucleophile. This make the nucleophile less reactive, as its lone pair becomes less available to attack.
The ability of nucleophiles to participate in hydrogen bonding decreases as we go down the periodic table. This means that the lone pairs of iodide ion will be considerably more “free” than those of fluoride, resulting in higher rates (and greater nucleophilicity).

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which of the following would cause the percent ionization of a week acid to increase?

Options:
A Addition of a strong acid
B Addition of a salt containing its conjugate base
C Diluting with more water
D The percent ionization of a week acid is a constant and cannot be increased.

The correct answer is:
Diluting with more water

Solution:
Ka=Cα21-α .
If α<5% , then 1-α=1
So Ka=Cα2
or α=KaC
This shows that degree of ionization is inversely proportional to the square root of its molar concentration. Hence, α increases when solution is diluted with water.

Topic: Chemistry, Ionic Equilibrium, NEET
Which of the following would happen if the supply of O2 is decreased to an illuminated wheat plant?

Options:
A Its photosynthesis would decrease
B Its respiration would increase
C Its photosynthesis would increase
D All the physiological process would stop

The correct answer is:
Its photosynthesis would increase

Solution:
If the amount of oxygen in the atmosphere decreases then photosynthesis will increase in C3 cycle (wheat) and no change in C4 cycle.

Topic: Biology, Photosynthesis in Higher Plants, NEET
Which of the following would have a permanent dipole moment?

Options:
A $\mathrm{SiF}_4$
B $\mathrm{SF}_4$
C $\mathrm{XeF}_4$
D $\mathrm{BF}_3$

The correct answer is:
$\mathrm{SiF}_4$

Solution:
Permanent dipoles occur when two atoms in moleculehave substantially different electronegativity: One atom attracts electrons more than another, becoming more negative, while the other atom becomes more positive. A molecule with a permanent dipole moment is called a polar molecule.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET, NEET 2005