datavorous/entrance-exam-dataset huggingface dataset:
Which of the following acids is commonly found in citrus fruits and can also hydrolyze sucrose?

Options:
A Citric acid
B Acetic acid
C Lactic acid
D Phosphoric acid

The correct answer is:
Citric acid

Solution:
Citric acid, commonly found in citrus fruits, is known to be able to hydrolyze sucrose.

Topic: Chemistry, Biomolecules, NEET
Which of the following acids will give maximum yield of alkyl bromide in Hunsdiecker reaction?

Options:
A CH3-CH2-CH2-COOH
B
C
D

The correct answer is:
CH3-CH2-CH2-COOH

Solution:
CH3-CH2-CH2-COOH will give maximum yield of alkyl bromide in Hunsdiecker reaction as in this reaction the yield of the product is as follows
1° -alkyl halide >2° -alkyl halide >3° -alkyl halide.
RCOOAg+Br2→CCl4R-Br+CO2+AgBr

Topic: Chemistry, Carboxylic Acid Derivatives, NEET
Which of the following act as a brain in cockroach?

Options:
A Suprapharyngeal ganglion
B Supraoesophageal ganglion
C Ventral nerve cord
D Segmental ganglion

The correct answer is:
Supraoesophageal ganglion

Solution:
The nervous system of cockroach is spread throughout the body. The head holds a bit of a nervous system while the rest is situated along the ventral (belly-side) part of its body. So, now you understand that if the head of a cockroach is cut off, it will still live for as long as one week. In the head region, the brain is represented by supra-oesophageal ganglion which supplies nerves to antennae and compound eyes.

Topic: Biology, Structural Organisation in Animals, NEET
Which of the following acts as a circuit protective device?

Options:
A Conductor
B Inductor
C Switch
D Fuse

The correct answer is:
Fuse

Solution:
Fuse is used for protecting appliances due to short circuiting or overloading. The fuse is rated for a certain maximum current and blows off when a current more than the rated value flows through it.

Topic: Physics, Alternating Current, NEET, NEET 2019 (All India)
Which of the following acts as ''natural scavengers''?

Options:
A Man
B Seagull
C Insects
D Microorganisms

The correct answer is:
Microorganisms

Solution:
The detrivores together with the decomposers (bacteria, actinomycetes & fungi) are sometimes referred to as reducers. The two are also called scavengers because they clean the earth.

Topic: Biology, Ecosystem, NEET
Which of the following addictive habit could lead to danger of urinary bladder, throat and lungs cancer?

Options:
A Tar
B Morphine
C Heroin
D LSD

The correct answer is:
Tar

Solution:
Tar is the chemical substance made when tobacco is burned. Smoking causes cancers of the lung, esophagus, larynx, mouth, throat, kidney, bladder, liver, pancreas, stomach, cervix, colon, and rectum, as well as acute myeloid leukemia.

Topic: Biology, Human Health and Diseases, NEET
Which of the following alcohols cannot turn orange colour of chromic acid to green?

(A) 1o alcohol
(B) 2o alcohol
(C) 3o alcohol
(D) Allylic alcohol

Options:
A 3o alcohol
B 2o alcohol
C 1o alcohol
D Allylic alcohol

The correct answer is:
3o alcohol

Solution:
Chromic acid H2CrO4 : Can detect 1oROH,2oROH and 3oROH

Chromic acid oxides 1o and 2o and alcohols but cannot oxides 3o alcohols.

Does not from C r 3+ does not convert into green.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following alcohol(s) don't/does not give white turbidity on treatment with conc. HCl/ZnCl2 even on heating?

Options:
A CH3CH2OH
B
C
D (CH3)3COH

The correct answer is:

Solution:
does not produce carbocation as it would be highly unstable due to very strong electron withdrawing effect of (-CN)

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following alcohols is likely to be miscible with water in all proportions?

Options:
A Methanol
B Ethanol
C Propanol
D Butanol

The correct answer is:
Methanol

Solution:
Methanol is a lower molecular mass alcohol and is miscible with water in all proportions due to strong hydrogen bonding.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following algae contains mannitol as reserve food material?

Options:
A Ectocarpus
B Gracilaria
C Volvox
D Ulothrix

The correct answer is:
Ectocarpus

Solution:
Laminarin and mannitol are the complex sugar alcohols found in the Phaeophyceae or brown algae members. Laminaria, Sargassum, Ectocarpus, Fucus are examples of marine brown algae which contain mannitol.

Topic: Biology, Plant Kingdom, NEET, NEET 2021
Which of the following algae is used to prepare culture medium to grow microbe?

Options:
A Gelidium
B Laminaria
C Chlorella
D Both (A) and (B)

The correct answer is:
Gelidium

Solution:
Porphyra, Laminaria and Sargassum are among the 70 species of marine algae used as food. Certain marine brown and red algae produce large amounts of hydrocolloids (water-holding substances), e.g., algin (brown algae) and carrageen (red algae) which are used commercially. Agar, one of the commercial products obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies. Chlorella a unicellular alga rich in proteins is used as food supplement even by space travellers.

Topic: Biology, Plant Kingdom, NEET
Which of the following alkali metal carbonates is known to be thermally stable and widely used in various applications, including in antacids?

Options:
A Sodium carbonate (Na2CO3)
B Potassium carbonate (K2CO3)
C Lithium carbonate (Li2CO3)
D Rubidium carbonate (Rb2CO3)

The correct answer is:
Sodium carbonate (Na2CO3)

Solution:
Sodium carbonate (Na2CO3), also known as soda ash or washing soda, is thermally stable and widely used in various applications, including as an ingredient in antacids.

Topic: Chemistry, s Block Elements, NEET
Which of the following alkali metal halides has the lowest magnitude of lattice energy?

Options:
A LiF
B NaCl
C KBr
D CsI

The correct answer is:
CsI

Solution:
Here CsI has the lowest lattice energy.
Lattice energy is directly proportional to the product of charges on the ions and inversely proportional to the interionic distance (which depends on the size of cation and anion). Hence, bigger the sizes of cation and anion, smaller are the lattice energy.

Topic: Chemistry, s Block Elements, NEET
Which of the following alkaline earth metal oxides does not combine with excess oxygen to form a superoxide?

Options:
A Beryllium oxide (BeO)
B Magnesium oxide (MgO)
C Calcium oxide (CaO)
D Barium oxide (BaO)

The correct answer is:
Beryllium oxide (BeO)

Solution:
Beryllium oxide (BeO) does not combine with excess oxygen to form a superoxide, unlike the other alkaline earth metal oxides.

Topic: Chemistry, s Block Elements, NEET
Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?

Options:
A SrSO4
B CaSO4
C BeSO4
D BaSO4

The correct answer is:
BeSO4

Solution:
Here in case of BeSO4ΔHHY> Latice energy while for rest of the sulphates
ΔHHY<Laticeenergy

Topic: Chemistry, s Block Elements, NEET
Which of the following alkaline earth metals has the highest atomic number?

Options:
A Beryllium (Be)
B Magnesium (Mg)
C Calcium (Ca)
D Barium (Ba)

The correct answer is:
Barium (Ba)

Solution:
Barium has the highest atomic number among the given options. It is located further down the alkaline earth metal group in the periodic table.

Topic: Chemistry, s Block Elements, NEET
Which of the following alkaline earth metals imparts a brick red color to a flame during a flame test?

Options:
A Beryllium
B Magnesium
C Calcium
D Strontium

The correct answer is:
Calcium

Solution:
Calcium imparts a brick red color to a flame during a flame test.

Topic: Chemistry, s Block Elements, NEET
Which of the following alkaloids cause emphysema and high blood pressure?

Options:
A Quinoline
B Nicotine
C Caffeine
D None of these

The correct answer is:
Nicotine

Solution:
Tobacco contains a large number of chemical substances including nicotine, an alkaloid. Nicotine stimulates the adrenal gland to release adrenaline and nor-adrenaline into blood circulation, both of which raise blood pressure and increase heart rate. Smoking is associated with an increased incidence of cancer of the lung, Urinary bladder and throat, bronchitis, emphysema, Coronary heart disease, gastric ulcer, etc. Tobacco chewing is associated with increased risk of cancer of the oral cavity. Smoking increases carbon monoxide (CO) content in blood and reduces the concentration of haemoglobin oxygen. This causes oxygen deficiency in the body or emphysema.

Topic: Biology, Human Health and Diseases, NEET
Which of the following alkane cannot be made in good yield by Wurtz reaction?

Options:
A 2,3-Dimethylbutane
B n-Heptane
C n-Butane
D n-Hexane

The correct answer is:
n-Heptane

Solution:
Wurtz Reaction is a good method to synthesize symmetrical alkanes and n-Heptane can not be made in good yield using Wurtz reaction since it is unsymmetrical alkane.

Topic: Chemistry, Hydrocarbons, NEET, NEET 2020 (Phase 1)
Which of the following alkanes has the highest heat of combustion per mole?

Options:
A Methane
B Ethane
C Propane
D Butane

The correct answer is:
Methane

Solution:
Methane has the highest heat of combustion per mole among the given options. This is because it has the highest hydrogen-to-carbon ratio, and combustion of hydrogen-rich compounds releases more energy.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following alkanes is expected to be the major product in the isomerization reaction?

Options:
A 2-Methylpentane
B 3-Methylpentane
C n-Hexane
D n-Butane

The correct answer is:
3-Methylpentane

Solution:
In the isomerization reaction, the major product is typically the one with the most stable or branched structure. 3-Methylpentane is a branched-chain alkane and is more stable than the others, making it the major product.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following alkanes is most likely to form a minor product in the isomerization reaction with anhydrous aluminum chloride and hydrogen chloride gas?

Options:
A 2-Methylpentane
B 3-Methylpentane
C n-Hexane
D n-Butane

The correct answer is:
2-Methylpentane

Solution:
In the isomerization reaction with anhydrous aluminum chloride and hydrogen chloride gas, the formation of minor products is more likely to occur when there are branching or substitution on the alkane chain. 2-Methylpentane is a branched-chain alkane and is more likely to undergo isomerization, leading to minor products.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following alkanes is not obtained by Wurtz reaction?

Options:
A Methane
B Ethane
C butane
D hexane

The correct answer is:
Methane

Solution:
In Wurtz reaction alkane with two or more than two carbon can only be prepared.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following alkene on acid-catalysed hydration form 2-methylpropan-2-ol?

Options:
A (CH 3 ) 2 C =  CH 2
B CH3CH=CH2
C CH3CH=CHCH3
D CH3CH2CH=CH2

The correct answer is:
(CH 3 ) 2 C =  CH 2

Solution:
Here the measure product is formed as follows
Mechanism

Topic: Chemistry, Hydrocarbons, NEET
Which of the following alkenes has a faint sweet smell?

Options:
A Ethene
B Propene
C Butene
D Pentene

The correct answer is:
Ethene

Solution:
Ethene is the only alkene mentioned with a faint sweet smell.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following alkyl halides is more likely to undergo Friedel-Crafts alkylation with benzene?

Options:
A 1-chloropropane
B 1-chlorobutane
C 1-chloropentane
D 1-chlorohexane

The correct answer is:
1-chloropropane

Solution:
Smaller alkyl halides, such as 1-chloropropane, are more likely to undergo Friedel-Crafts alkylation with benzene because they are less sterically hindered and more reactive in electrophilic substitution reactions.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following alkyl halides is used to prepare ethane in the Wurtz reaction?

Options:
A Bromomethane
B Chloroethane
C Iodopropane
D Fluoroethane

The correct answer is:
Bromomethane

Solution:
Bromomethane is used in the Wurtz reaction to prepare ethane.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following amine does not react with Hinsberg reagent?

Options:
A Neopentyl amine
B Isopropyl amine
C Triethyl amine
D Ethyl methyl amine

The correct answer is:
Triethyl amine

Solution:
Only 1 o and 2 o amine react Hinsberg reagent. 3 o amine can not be react with Hinsberg reagent. Therefore triethyl amine, Which is 3 o Amine can't be react with Hinsberg reagent. option (C) is correct

Topic: Chemistry, Amines, NEET
Which of the following amine will give the carbylamine test?

Options:
A
B
C

D

The correct answer is:

Solution:
Aniline is a primary amine. It can give a positive carbylamine test. In the carbylamine test or Hoffmann's carbylamine test (also known as Isocyanide test), the aliphatic or aromatic primary amine of consideration is heated with chloroform in the presence of alcoholic potassium hydroxide to give foul-smelling alkyl/aryl isocyanide or carbylamine.
Since is primary amine, it gives carbylamine test (isocyanide test)

Topic: Chemistry, Amines, NEET, NEET 2020 (Phase 1)
Which of the following amines does not react with Hinsberg reagent ?

Options:
A Neopentyl amine
B Isopropyl amine
C Triethyl amine
D Ethyl methyl amine

The correct answer is:
Triethyl amine

Solution:
Triethyl amine is a tertiary amine. It does not react with Hinsberg reagent.

Topic: Chemistry, Amines, NEET
Which of the following amines form N- nitroso derivative when treated with NaNO2 and HCl ?

Options:
A CH3NH2
B
C
D

The correct answer is:

Solution:
Only (C) is 2° amine it from nitrosamine.

Topic: Chemistry, Amines, NEET
Which of the following amines forms a yellow oil with NaNO2/conc.HCl ?

Options:
A C6H5–NH–CH3
B C6H5–NH–C6H5
C C2H5–NH–C2H5
D All of these

The correct answer is:
All of these

Solution:
Here all these amines can form yellow oil with NaNO2/conc.HCl as follows

Topic: Chemistry, Amines, NEET
Which of the following amines is not expected to give a positive carbylamine test?

Options:
A Methylamine
B Ethylamine
C Dimethylamine
D Trimethylamine

The correct answer is:
Trimethylamine

Solution:
Tertiary amines like trimethylamine do not give a positive carbylamine test as they do not undergo this reaction.

Topic: Chemistry, Amines, NEET
Which of the following amines will have the highest basic strength in aqueous solution?

Options:
A (C2H5)3N
B (CH3)2NH
C NH3
D C2H5NH2

The correct answer is:
(C2H5)3N

Solution:
Among the options given, (C2H5)3N is a tertiary amine and will have the highest basic strength in aqueous solution.

Topic: Chemistry, Amines, NEET
Which of the following amino acid doesn't show degeneracy?

Options:
A Leucine
B Proline
C Cysteine
D Tryptophan

The correct answer is:
Tryptophan

Solution:
Some amino acids are coded by more than one codon, hence the code is degenerate. Leucine is coded by 6 amino acids UUA, UUG, CUU, CUC, CUA and CUG. Proline is coded by 4 amino acids CCU, CCC, CCA and CCG. Cysteine is coded by 2 amino acids UGU and UGC. Tryptophan is coded by just one codon UGG, and hence tryptophan is not degenerate.

Topic: Biology, Molecular Basis of Inheritance, NEET
Which of the following amino acid forms sulphide bond in polypeptide

Options:
A Arg
B Cys
C Leu
D Gly

The correct answer is:
Cys

Solution:
Cystine forms sulphide bond in polypeptide as Cystine has bisulphide linkage.

Topic: Chemistry, Biomolecules, NEET
Which of the following amino acid is essential .

Options:
A Valine
B Alanine
C Aspartic acid
D None of these

The correct answer is:
Valine

Solution:
Essential amino acids: The amino acids which cannot be synthesised in the body and must be obtained through diet, are known as essential amino acids.

Example: Valine, Leucine.

Non-essential amino acids: The amino acids, which can be synthesised in the body, are known as non-essential amino acids.

Example: Alanine, Aspartic acid.

Topic: Chemistry, Biomolecules, NEET
Which of the following amino acid is not optically active and has achiral carbon?

Options:
A Alanine
B Serine
C Glycine
D Lysine

The correct answer is:
Glycine

Solution:
Glycine is the simplest amino acid that has H atom as side chain R. It is the only amino acid that doesn't have any optical isomer and is achiral in nature.

Topic: Chemistry, Biomolecules, NEET
Which of the following amino acids do not give purple colour on reaction with ninhydrin?

Options:
A proline
B alanine
C glycine
D both A and B

The correct answer is:
proline

Solution:
Except proline and hydroxyproline (yellow colour), all α -amino acids give purple colour with ninhydrin.

Topic: Chemistry, Biomolecules, NEET
Which of the following amino acids has hydrogen in its R group?

Options:
A Alanine
B Serine
C Glycin
D Cysteine

The correct answer is:
Glycin

Solution:
The R group in these proteinaceous amino acids could be a hydrogen (the amino acid is called glycine),a methyl group (alanine) , hydroxy methyl (serine), etc

Topic: Chemistry, Biomolecules, NEET
Which of the following amino acids is coded by only single codon?

Options:
A Tyrosine
B Phenylalanine
C Tryptophan
D Isoleucine

The correct answer is:
Tryptophan

Solution:
The amino acid tryptophan is coded solely by a single codon of UGG. Tyrosine is coded by two different codons: UAU and UAC, phenylalanine is coded by two codons: UUU and UUC, and isoleucine is coded by 3 codons: AUU, AUC and AUA.

Topic: Biology, Molecular Basis of Inheritance, NEET
Which of the following animal has a network of neurons but does not comprise the brain?

Options:
A Sycon
B Pleurobrachia
C Hydra
D Periplaneta

The correct answer is:
Hydra

Solution:
The neural organisation is very simple in lower invertebrates. For example, in Hydra it is composed of a network of neurons. The neural system is better organised in insects, where a brain is present along with a number of ganglia and neural tissues. The vertebrates have a more developed neural system.

Topic: Biology, Neural Control and Coordination, NEET
Which of the following animals are true coelomates with bilateral symmetry?

Options:
A Adult echinoderms
B Aschelminthes
C Platyhelminthes
D Annelids

The correct answer is:
Annelids

Solution:
Annelids are true coelomates with bilateral symmetry. These exhibit organ-system level of body organisation with true coelom. They are triploblastic, metamerically segmented and coelomate animals, e.g. earthworm.

Topic: Biology, Animal Kingdom, NEET, NEET 2019 (Odisha)
Which of the following animals belongs to phylum Coelenterata?

Options:
A Sea horse
B Sea hare
C Sea pen
D Sea cucumber

The correct answer is:
Sea pen

Solution:
A sea pen is Gorgonia. it belongs to Phylum Coelenterata. This is also known as Phylum Cnidaria due to the presence of Cnidoblast cells. These are stinging cells present on the tentacles. This phylum includes tissue level organisation and are acoelomates. Metagenesis is the characteristic feature seen in many Coelenterates.
Sea horse is a chordate (Osteichthyes). Sea hare and sea cucumber belong to Phylum Mollusca.

Topic: Biology, Animal Kingdom, NEET
Which of the following animals does not undergo metamorphosis?

Options:
A Moth
B Tunicate
C Earthworm
D Starfish

The correct answer is:
Earthworm

Solution:
All the given animals except earthworm undergo metamorphosis. Earthworm exhibits direct development where no larval stage is involved.
Metamorphosis is usually seen in animals exhibiting indirect development, involving a larval stage which Later transformed into an adult.
The larval form of moth is a caterpillar and that of tunicates is a tadpole.
In starfish, bipinnaria larva forms into adult.

Topic: Biology, Animal Kingdom, NEET, NEET 2018
Which of the following animals has three chambered heart?

Options:
A Scoliodon
B Hippocampus
C Chelone
D Pteropus

The correct answer is:
Chelone

Solution:
3 chambered heart is present in Chelone (Turtle), as Reptiles have 3 chambered heart.
Pteropus is fire fox (a mammal) with 4 chambered heart.
$\rightarrow$ Scoliodon $\rightarrow 2$ chambered Heart.

Topic: Biology, Body Fluids and Circulation, NEET, NEET 2022 (Phase 2)
Which of the following animals have different symmetry in comparison to the other three?

Options:
A Pila
B Pleurobrachia
C Sycon
D Asterias

The correct answer is:
Pila

Solution:
Types of animals on the basis of symmetry -
A. Asymmetrical - No particular symmetry. Examples - Most of the sponges
B. Radially symmetrical - When any plane passing through the central axis of the body divides the organism into 2 equal halves. Examples - Few sponges, coelenterates, ctenophores and adult echinoderms.
C. Bilaterally symmetrical - If the body of an organism is divisible into 2 equal halves only in one plane. Examples - Platyhelminthes, aschelminthes, annelids, arthropods, molluscs, the larva of echinoderms and chordates.

Topic: Biology, Animal Kingdom, NEET
Which of the following animals is not a pair of poikilotherms?

Options:
A Rana, Trygon
B Labeo, Pteropus
C Pristis, Carcharodon
D Scoliodon, Naja

The correct answer is:
Labeo, Pteropus

Solution:
Fishes (like Labeo, Torpedo, Pristis, Carcharodon, Scoliodon, Trygon), Amphibians (Rana) and Reptiles (Naja) are poikilotherms but Pteropus (mammal) is a homeotherm.

Topic: Biology, Animal Kingdom, NEET
Which of the following animals is not a pair of poikilotherms?

Options:
A Torpedo, Trygon
B Trygon, Panthera
C Pristis, Carcharodon
D Scoliodon, Trygon

The correct answer is:
Trygon, Panthera

Solution:
Fishes like Torpedo, Pristis, Carcharodon, Scoliodon, Trygon are poikilotherms but Panthera is homeotherm.

Topic: Biology, Animal Kingdom, NEET
Which of the following animals possess a coelom?

Options:
A Aschelminthes
B Chordates
C Platyhelminthes
D Molluscs

The correct answer is:
Chordates

Solution:
Coelomates are animals that possess a body cavity lined by mesoderm, called a coelom. Chordates and molluscs are examples of coelomates.

Topic: Biology, Animal Kingdom, NEET
Which of the following animals undergo aestivation?

Options:
A zooplankton and phytoplankton
B snails and fish
C bears and seals
D snails and octopus

The correct answer is:
snails and fish

Solution:
In animals, the organism, if unable to migrate, might avoid the stress by escaping in time. The familiar case of bears going into hibernation during winter is an example of escape in time. Some snails and fish go into aestivation to avoid summer–related problems-heat and dessication. Under unfavourable conditions many zooplankton species in lakes and ponds are known to enter diapause, a stage of suspended development.

Topic: Biology, Organisms and Populations, NEET
Which of the following anions is present in the chain structure of silicates?

Options:
A $\left(\mathrm{Si}_2 \mathrm{O}_5^{2-}\right)_n$
B $\left(\mathrm{SiO}_3^{2-}\right)_n$
C $\mathrm{SiO}_4^{4-}$
D $\mathrm{Si}_2 \mathrm{O}_7^{6-}$

The correct answer is:
$\left(\mathrm{SiO}_3^{2-}\right)_n$

Solution:
In silicates, two oxygen atoms per $\mathrm{SiO}_4$ tetrahedron are shared giving polymeric anion chains.
When each tetetrahedron \(\left(\mathrm{SiO}_4^{4-}\right)\) shares two O atoms, infinite chains are formed. The formula of these extended anions approximates to \(\left(\mathrm{SiO}_3\right)_n^{2 n-}\) or \(\left(\mathrm{SiO}_3^{2-}\right)_n . \mathrm{SiO}_4^{4-}\) anion is present in orthosilicates. \(\mathrm{Si}_2 \mathrm{O}_7^{6-}\) anion is present in pyrosilicates, while \(\left(\mathrm{Si}_2 \mathrm{O}_5^{2-}\right)_n\) anion is present in double-chain silicates as well as in sheet silicates.
Structure of silicate:

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET, NEET 2007
Which of the following anions is present in the chain structure of silicates?

Options:
A (Si2O52-)
B (SiO32-)
C SiO44-
D Si2O76-

The correct answer is:
(SiO32-)

Solution:
Chain silicates are formed by sharing two oxygen atoms by each tetrahedron. Anions of chain silicate have two general formula
(i)(SiO3)n2n-
(ii)(Si4O11)n6n-

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET