datavorous/entrance-exam-dataset huggingface dataset:
Which of the following does not give oxygen on heating?

Options:
A Zn(ClO3)2
B K2Cr2O7
C (NH4)2Cr2O7
D KClO3

The correct answer is:
(NH4)2Cr2O7

Solution:
Zn ( ClO 3 ) 2 â Î ZnCl 2 +3 O 2
K2Cr2O6âÎ2K2CrO4+CrO3+32O2
2KClO3â2KCl+3O2
( NH 4 ) 2 Cr 2 O 7 → Δ N 2 + Cr 2 O 3 +2 H 2 O
Hence only ammonium dichromate does not give oxygen on heating but gives N2 .

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following does not happen during embryogenesis?

Options:
A Cell multiplication
B Cell differentiation
C Equational division
D Reduction division

The correct answer is:
Reduction division

Solution:
Embryogenesis is the process by which the embryo forms and develops. In mammals, the term refers chiefly to early stages of prenatal development, whereas the terms fetus and fetal development describe later stages. Embryogenesis starts with the fertilization of the egg cell (ovum) by a sperm cell, (spermatozoon). Once fertilized, the ovum is referred to as a zygote, a single diploid cell. The zygote undergoes mitotic divisions with no significant growth (a process known as cleavage) and cellular differentiation, leading to development of a multicellular embryo.
Hence, reduction division or meiosis is not involved in embryogenesis.

Topic: Biology, Reproduction in Organisms, NEET
Which of the following does not happen during stomatal opening?

Options:
A Accumulation of K+ ion in guard cell
B Increased TP of guard cell
C Increased thickening of inner wall of guard cell
D Decrease in pH of guard cell

The correct answer is:
Increased thickening of inner wall of guard cell

Solution:
The immediate cause of the opening or closing of stomata is a change in the turgidity of the guard cells. During opening, pH of the guard cell decreases, PEP case becomes functional, PEP forms malic acid which dissociates into H+ and malate ion and K+ âH+ pump causes accumulation of K+ in guards cell, increasing its turgor pressure.

Topic: Biology, Transport in Plants, NEET
Which of the following does not happen during the stomatal opening?

Options:
A Turgor pressure of guard cell increases.
B K⁺ concentration in guard cell increases.
C Thin outer walls bulge outwards.
D Guard cell loose turgor due to water loss.

The correct answer is:
Guard cell loose turgor due to water loss.

Solution:
During stomatal opening K+ concentration in guard cell increases as a result endoosmosis occurs, guard cell becomes turgid, its thin outer wall bulges out and stomata opens.

Topic: Biology, Transport in Plants, NEET
Which of the following does not have a metal carbon bond?

Options:
A $\mathrm{Al}\left(\mathrm{OC}_2 \mathrm{H}_5\right)_3$
B $\mathrm{C}_2 \mathrm{H}_5 \mathrm{MgBr}$
C $\mathrm{K}\left[\mathrm{Pt}\left(\mathrm{C}_2 \mathrm{H}_4\right) \mathrm{Cl}_3\right]$
D $\mathrm{Ni}(\mathrm{CO})_4$

The correct answer is:
$\mathrm{Al}\left(\mathrm{OC}_2 \mathrm{H}_5\right)_3$

Solution:
$\mathrm{Al}\left(\mathrm{OC}_2 \mathrm{H}_5\right)_3$ contains bonding through $\mathrm{O}$ and thus it does not have metal-carbon bond.

Topic: Chemistry, Coordination Compounds, NEET, NEET 2004
Which of the following does not have an elaborate mechanism of spore dispersal?

Options:
A Funaria
B Polytrichum
C Sphagnum
D Riccia

The correct answer is:
Riccia

Solution:
The sporophyte in mosses is more elaborate than that in liverworts. The capsule contains spores. Spores are formed after meiosis. The mosses have an elaborate mechanism of spore dispersal. Common examples of mosses are Funaria, Polytrichum, and Sphagnum.
Riccia is a member of liverworts.

Topic: Biology, Plant Kingdom, NEET
Which of the following does not have coordinate bonds?

Options:
A CO32-
B O3
C CH3-NC
D CO

The correct answer is:
CO32-

Solution:
Carbonate ion has no coordinate bond.
Rest all have coordinate bonds for e.g. C=←O

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following does not have the lipase enzyme for the digestion of lipids?

Options:
A stomach
B pancreas
C small intestine
D large intestine

The correct answer is:
large intestine

Solution:
Lipase enzyme brings about digestion of fats i.e.hydrolysis of fats.It is secreted by the stomach, pancreas and small intestine.It is a subclass of esterases.

Topic: Biology, Digestion and Absorption, NEET
Which of the following does not illustrate the anomalous behaviour of lithium?

Options:
A Lithium reacts with nitrogen to form a nitride
B Lithium is the hardest alkali metal
C Lithium reacts with oxygen to form normal oxide only
D Li2CO3 decomposes on heating

The correct answer is:
Lithium is the hardest alkali metal

Solution:
Lithium is expected to be the hardest metal among the alkali metals due to strongest metallic bond. Rest other properties given here are examples of anomalous behaviour of lithium.

Topic: Chemistry, s Block Elements, NEET
Which of the following does not liberate Br2 from KBr?

Options:
A I2
B Cl2
C Conc.H2SO4
D F2

The correct answer is:
I2

Solution:
I2 cannot liberate Br2 from KBr, since I2 is weaker oxidant than Br2.F2 and Cl2 , being stronger oxidants than Br2 , can liberate Br2 from KBr.
F2+2KBr→2KF+Br2
Cl2+2KBr→2KCl+Br2
Reaction of conc. H2SO4 with KBr forms HBr. HBr is a strong reducing agent. It reduces H2SO4 to form a mixture of SO2 and Br2 .
KBr+H2SO4→HBr+KHSO4
KHSO4+KBr→HBr+K2SO4
HBr so formed reduces H2SO4 .
H2SO4+2HBr→SO2+2H2O+Br2

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following does not match?

Options:
A Pancreas - Largest exocrine gland
B Antigen - Antibody
C Thyroid - Goitre
D Enzyme - Substrate

The correct answer is:
Pancreas - Largest exocrine gland

Solution:
The pancreas is a mixed gland, i.e., the pancreas secretes hormones and enzymes both. The largest exocrine gland is the liver.

Topic: Biology, Digestion and Absorption, NEET
Which of the following does not occur during respiration?

Options:
A Diffusion of O₂ and CO₂ between blood and tissues
B Transport of gases by the blood
C Utilisation of O₂ by the cells
D Absorption of food

The correct answer is:
Absorption of food

Solution:
Absorption of food is not a part of the process of respiration. Respiration involves breathing, diffusion of gases, transport of gases, and utilization of O₂ by the cells.

Topic: Biology, Breathing and Exchange of Gases, NEET
Which of the following does not participate in excretion in cockroach?

Options:
A Fat body
B Phallic gland
C Urecose gland
D Malpighian tubules.

The correct answer is:
Phallic gland

Solution:
Phallic gland is the part of reproductive system of male cockroach. The duct of phallic gland open in the left phallomere and its secretion forms the outermost layer of spermatophore.

Topic: Biology, Structural Organisation in Animals, NEET
Which of the following does not play any role in the movement of water through the xylem?

Options:
A Capillarity
B Root pressure
C H+/ATPase pump at the xylem element membrane
D Transpirational pull

The correct answer is:
H+/ATPase pump at the xylem element membrane

Solution:
ATPase pumps are found on the membranes of the living component i.e. cell or organelle. Because xylem is a dead tissue through which conduction of water occurs, therefor no ATPase action is found in the xylem.

Topic: Biology, Transport in Plants, NEET
Which of the following does not produce any gaseous product when reacts with water?

Options:
A Ca3N2
B CaC2
C CaO
D Ca3P2

The correct answer is:
CaO

Solution:
Ca3N2+6H2O→3Ca(OH)2+2NH3↑
CaC2+2H2O→Ca(OH)2+C2H2↑
Ca3P2+6H2O→3Ca(OH)2+2PH3↑
CaO+H2O→Ca(OH)2(liquid)

Topic: Chemistry, s Block Elements, NEET
Which of the following does not react with oxygen directly?

Options:
A Zn
B Ti
C Pt
D Fe

The correct answer is:
Pt

Solution:
Correct Option is : (C)
Pt

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Which of the following does not reduce Tollen's reagent?

Options:
A CH3CHO
B C6H5NHOH
C HCOOH
D C6H5NO2

The correct answer is:
C6H5NO2

Solution:
Option A, B and C reduce Tollen's reagent.
A. CH 3 CHO+2 Ag ( NH 3 ) 2 + +3 OH − → CH 3 COO − +2Ag+2 H 2 O+4 NH 3
B. C6H4NHOH+2[Ag(NH3)2]++2OH-âC6H5NO+4NH3+2Ag+2H2O
C. HCOOH+2[Ag(NH3)2]++2OH-â2Ag+4NH3+CO2+2H2O

Topic: Chemistry, Aldehydes and Ketones, NEET
Which of the following does not represent the correct order of the properties indicated?

Options:
A Ni2+>Cr2+>Fe2+>Mn2+size
B Sc>Ti>Cr>Fe size
C Mn2+>Ni2+<Co2+<Fe2+Â unpairedÂ electron
D Fe2+>Co2+>Ni2+>Cu2+unpairedÂ electron

The correct answer is:
Ni2+>Cr2+>Fe2+>Mn2+size

Solution:
In a period on moving from left to right ionic radii decreases.
a. So order of cationic radii is
Cr2+>Mn2+>Fe2+>Ni2+ and
b. Sc>Ti>Cr>Mn
(correct order of atomic radii)
c. For unpaired electron
Mn2+Five>Ni2+Two<Co2+Three<Fe2+Four
d. For unpaired electrons
Fe2+Four>Co2+Three<Ni2+Two<Cu2+One

Topic: Chemistry, d and f Block Elements, NEET
Which of the following does not respond to iodoform reaction?

Options:
A (CH3)2CHCH(OH)CH3
B PhCH2CHOHCH3
C PhCH(OH)CH2CH3
D CH3CH2OH

The correct answer is:
PhCH(OH)CH2CH3

Solution:
The alcohol C does not contain the grouping,
Hence, it does not respond to iodoform reaction. The other alcohols A, B and D have the grouping,

Topic: Chemistry, Aldehydes and Ketones, NEET
Which of the following does not show divergent evolution?

Options:
A Brain of bat, man and cheetah
B Heart of bat, man and cheetah
C Forelimbs of man, bat and cheetah
D Eye of octopus, bat and man

The correct answer is:
Eye of octopus, bat and man

Solution:
Divergent evolution occurs in the same structure, example - forelimbs, heart, the brain of vertebrates which have developed along different directions due to adaptation to different needs. except the option 4, all are showing divergent evolution. whereas eye of the octopus, bat and man are examples of analogous organs showing convergent evolution. (octopus belongs to phylum Mollusca)

Topic: Biology, Evolution, NEET, NEET 2018
Which of the following does not show divergent evolution?

Options:
A Brain of bat, man and cheetah
B Heart of bat, man and cheetah
C Forelimbs of man, bat and cheetah
D Eye of octopus, bat and man

The correct answer is:
Eye of octopus, bat and man

Solution:
Divergent evolution occurs in the same structure, example - forelimbs, heart, the brain of vertebrates which have developed along different directions due to adaptation to different needs. except the option 4, all are showing divergent evolution. whereas eye of the octopus, bat and man are examples of analogous organs showing convergent evolution. (octopus belongs to phylum Mollusca)

Topic: Biology, Evolution, NEET
Which of the following does not show negative oxidation states?

Options:
A S
B Se
C Te
D Po

The correct answer is:
Po

Solution:
Correct Option is : 4
Po

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following does not show optical isomerism?
(en = ethylenediamine)

Options:
A $\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{+}$
B $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]^0$
C $\left[\mathrm{Co}(\mathrm{en}) \mathrm{Cl}_2\left(\mathrm{NH}_3\right)_2\right]^{+}$
D $\left[\operatorname{Co}(\mathrm{en})_3\right]^{3+}$

The correct answer is:
$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]^0$

Solution:
Optical isomerism is exhibited by only those complexes in which elements of symmetry are absent. Octahedral complexes of the types $\left[\mathrm{M}(\mathrm{aa})_3\right],\left[\mathrm{M}(\mathrm{aa}) \mathrm{x}_2, \mathrm{y}_2\right]$ and $\left[\mathrm{M}(\mathrm{aa})_2 \mathrm{x}_2\right]$ have absence of elements of symmetry, thus exhibit optical isomerism. Here, $a a$ represents bidentate ligand, $x$ or $y$ represents monodentate ligand and $M$ represents central metal ion.
Hence, $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]^0$ due to presence of symmetry elements does not exhibit optical isomerism.

Topic: Chemistry, Coordination Compounds, NEET, NEET 2009 (Screening)
Which of the following does not show similarity between boron and aluminium?

Options:
A Both from oxides of type M2O3 when heated with oxygen at high temperature
B Both dissolve in alkalies and evolve hydrogen
C Hydroxides of both the elements are basic in nature
D Both form nitrides of MN type when heated with N2

The correct answer is:
Hydroxides of both the elements are basic in nature

Solution:
B(OH)3 is a weak monobasic Lewis acid while Al(OH)3 in amphoteric substance i.e. it can reacts with acid and base both.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Which of the following does not turn Schiff's reagent to pink?

Options:
A Formaldehyde
B Propanaldehyde
C Acetone
D Acetaldehyde

The correct answer is:
Acetone

Solution:
Acetone can't be turn Schiff's reagent to pink. Those carbonyl compound which contains Aldehyde group give the pink colour with Schiff's reagent. Therefore option. (C) is correct.

Topic: Chemistry, Carboxylic Acid Derivatives, NEET
Which of the following doesnâ€™t contain phenyl group in it?

Options:
A Tryptophan
B Histidine
C Phenylalanine
D Tyrosine

The correct answer is:
Histidine

Solution:
Correct Option is : 2
Histidine

Topic: Chemistry, Biomolecules, NEET
Which of the following doesn’t exist as ccp?

Options:
A Os
B Hg
C Au
D Ir

The correct answer is:
Hg

Solution:
Correct Option is : 2
Hg

Topic: Chemistry, d and f Block Elements, NEET
Which of the following doesn’t exist as hcp?

Options:
A Ti
B Zr
C Sc
D Cr

The correct answer is:
Cr

Solution:
Correct Option is : 4
Cr

Topic: Chemistry, d and f Block Elements, NEET
Which of the following doesnâ€™t exist in gaseous form?

Options:
A CH3Cl
B CH3Br
C CH3I
D CH3CH2Cl

The correct answer is:
CH3I

Solution:
Correct Option is : 3
CH3I

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which of the following doesn’t have P–O–P bonds?

Options:
A (HPO3)n
B H4P2O7
C H4P2O5
D H4P2O6

The correct answer is:
H4P2O6

Solution:
Correct Option is : 4
H4P2O6

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following doesn't involve anthropogenic action?

Options:
A Development of various breeds of dogs
B Development of varieties of cabbage
C Development of pesticide resistant organisms
D Development of varieties of marsupials

The correct answer is:
Development of varieties of marsupials

Solution:
Anthropogenic action is an action because of human act e.g. development of various breeds of dogs, industrial melanism (change in relative number of dark and light varieties of moth due to industrial pollution), and development of pesticide-resistant organisms.
The process of evolution of different species in a given geographical area starting from a point and literally radiating to other areas of geography (habitats) is called adaptive radiation. Darwin’s finches represent one of the best examples of this phenomenon. Another example is the Australian marsupials.

Topic: Biology, Evolution, NEET
Which of the following doesn't represent a surfactant?

Options:
A CH3-CH215-N+CH33Br-
B CH3-CH214-CH2NH2
C CH3-CH216-CH2OSO2-Na+
D OHC-CH214-CH2-COO-Na+

The correct answer is:
CH3-CH214-CH2NH2

Solution:
Every surfactant contains two parts a hydrophobic part and a hydrophilic part.

Hydrophobic part belongs to the long non polar carbon chain with some side chains. It is called as hydrophobic because it does not interact witht the water or water repellant.

Hydrophilic part belongs to the ionic head of the surfactant. It attracts the water molecules towards itself and combine with the water. It is water loving part.

Every surfactant must consists both of these hydrophobic and hydrophilic part for better cleansing ability of that surfacntant.

The compound

CH3CH214CH2NH2 contains only hydrophobic part but no hydrophilic part, hence it is not a surfactant.

Topic: Chemistry, Chemistry in Everyday Life, NEET
Which of the following don't occur naturally?

Options:
A IAA
B IBA
C NAA
D Both (A) and (B)

The correct answer is:
NAA

Solution:
Auxins are one the growth promoters found in plants. These are mostly produces by the apical parts of roots and stems and from there move to different parts of plant as per need. Indole-3-acetic acid(IAA) and indole butyric acid(IBA) are produced by plant and have been isolated as natural auxins.
NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic) are synthetic auxins that have been used in agricultural and horticultural practices.

Topic: Biology, Plant - Growth and Development, NEET
Which of the following double bonds is largest?

Options:
A C=O
B N=O
C C=N
D C=C

The correct answer is:
C=N

Solution:
Correct Option is : 3
C=N

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following drug is a very effective sedative and pain killer, and is very useful in patients who have undergone surgery?

Options:
A Cocaine
B Amphetamine
C Morphine
D Heroin

The correct answer is:
Morphine

Solution:
Morphine is a very effective sedative and pain killer that is very useful in a patient who has undergone surgery. It has a potent analgesic property. Cocaine is CNS stimulating drug.

Topic: Biology, Human Health and Diseases, NEET
Which of the following drug is anti-anxiety in nature?

Options:
A Benzodiazepines
B Barbiturates
C Both (a) and (b)
D Neither (a) nor (b)

The correct answer is:
Both (a) and (b)

Solution:
Drugs having anti-anxiety like barbiturates and benzodiazepines are normally used as medicines to treat patients suffering from mental illnesses like insomnia while stimulant drugs like amphetamines are used to treat depressions. Plants like Atropa belladonna, Cannabis sativa, Datura, and drugs like LSD have hallucinogenic properties. Opioids have a depressant effect.

Topic: Biology, Human Health and Diseases, NEET
Which of the following drug is obtained from the plant of genus Erythroxylum?

Options:
A Marijuana
B Hashish
C Heroin
D Cocaine

The correct answer is:
Cocaine

Solution:
Coca alkaloid or cocaine is obtained from coca plant Erythroxylum coca, native to South America. It interferes with the transport of the neuro-transmitter dopamine. Cocaine, commonly called coke or crack is usually snorted. It has a potent stimulating action on central nervous system, producing a sense of euphoria and increased energy. Excessive dosage of cocaine causes hallucinations.
Marijuana and hashish are obtained from Cannabis sativa. Heroin is diacetylmorphine obtained from Papaver somniferum.

Topic: Biology, Human Health and Diseases, NEET
Which of the following drugs can not be used clinically to help the patient cope with depression and insomnia?

Options:
A Barbiturates
B Amphetamines
C Benzodiazepines
D Cocaine

The correct answer is:
Cocaine

Solution:
Drugs like barbiturates, amphetamins, benzodiazepine and other similar drugs that are normally used as a medicine to help patients cope with mental illness like depression and insomnia.
Cocaine is an addictive stimulant which makes an individual alert and is used as a recreational drug.

Topic: Biology, Human Health and Diseases, NEET
Which of the following drugs is a tranquilizer and sedative

Options:
A Sulphadiazine
B Papaverine
C Equanil
D Mescaline

The correct answer is:
Equanil

Solution:
Tranquilizers reduce anxiety and tension they are also called psychototropic drugs. These are of two type. (1) Sedative drugs used for violent and mentaly agitated patient e.g., Equanil and diazepam. (2) Antidepressant – The drug are used to patients who are highly depressed and lose self confidence e.g. tofranil vitalin, amphetamine etc.

Topic: Chemistry, Chemistry in Everyday Life, NEET
Which of the following drugs is an analgesic?

Options:
A Sulpha guanidine
B Paludrin
C Analgin
D All of these

The correct answer is:
Analgin

Solution:
An analgesic drugs is one which relieves or decrease the pain e.g., analgin, aspirin (belongs to nonnarcotics and morphine, codein, heroin (belongs to narcotics class)

Topic: Chemistry, Chemistry in Everyday Life, NEET
Which of the following drugs is capable of producing a state of euphoria or increased energy?

Options:
A Coke obtained from Erythroxylum coca
B Heroin obtained from Cannabis sativa
C Charas obtained from Claviceps purpurea
D Morphine obtained from Papaver somniferum

The correct answer is:
Coke obtained from Erythroxylum coca

Solution:
Coke is the common name of coca alkaloid or cocaine obtained from the plant Erythroxylum coca. Cocaine has a great stimulating action on the CNS. It is capable of producing a state of euphoria or increased energy.

Topic: Biology, Human Health and Diseases, NEET
Which of the following duct/ducts helps in the transportation of sperm and seminal plasma?

Options:
A Vasa efferentia
B Epididymis
C Vas deferens
D All of the above

The correct answer is:
All of the above

Solution:
The male sex accessory ducts include rete testis, vasa efferentia, epididymis and vas deferens. The seminiferous tubules of the testis open into the vasa efferentia through rete testis. The vasa efferentia leave the testis and open into epididymis located along the posterior surface of each testis. The epididymis leads to vas deferens that ascends to the abdomen and loops over the urinary bladder. It receives a duct from seminal vesicle and opens into urethra as the ejaculatory duct. These ducts store and transport the sperms from the testis to the outside through urethra. The urethra originates from the urinary bladder and extends through the penis to its external opening called urethral meatus.

Topic: Biology, Human Reproduction, NEET
Which of the following dyes is not used for staining chromosomes?

Options:
A Basic Fuchsin
B Safranin
C Methylene green
D Carmine

The correct answer is:
Safranin

Solution:
Safranin stain is not used for staining chromosomes while Basic Fuchsin, Methylene green and Carmine are used for staining chromosomes.

Topic: Biology, Cell - The Unit of Life, NEET
Which of the following ecological pyramids can be inverted?
A. Pyramid of energy
B. Pyramid of number
C. Pyramid of biomass

Options:
A Only (a) and (b)
B Only (b)
C Only (b) and (c)
D All (a), (b), and (c)

The correct answer is:
Only (b) and (c)

Solution:
The pyramid of energy is always upright because the flow of energy is unidirectional from producer to consumer level. The energy content is maximum in producers. The energy decreases at each trophic level of the food chain, as part of the energy is lost as heat, and the major part of the energy is liberated during respiration for use in various activities.
Only 10 % of the energy of the previous trophic level is received by the next trophic level, as proposed by 10 percent law of Lindeman (1942).
Pyramid of biomass is a graphical representation of biomass present per unit area at different trophic levels. Tree and grassland ecosystems are upright as total biomass of plants (producers) in a specific area is more than that of herbivores (primary consumers) and it gradually decreases at each successive trophic level. It is least in top carnivores.
Marine biomass pyramid is often inverted as the producers are very small and have limited mass.
Pyramid of numbers is a graphical representation of a number of individuals presents per unit area at different trophic levels.
In, most ecosystems, the number of producers is maximum. Producers thus can support fewer herbivores and herbivores can support still fewer carnivores and so on. Thus the number of top carnivores is too small to support any other trophic level and does not act as prey to any other organism.
In the parasitic food chain, at each successive trophic level, the number of the organisms is higher than in the preceding one, and the size decreases gradually at a successive level. Thus, the shape of the pyramid may be inverted.

Topic: Biology, Ecosystem, NEET