datavorous/entrance-exam-dataset huggingface dataset:
Beilstein test is used for determination of

Options:
A N2
B Cl
C Na
D CO2

The correct answer is:
Cl

Solution:
Beilstein test – In this test organic compound is heated on a copper wire in a flame. The appearance of a green or bluish green flame due to the formation of volatile cupric halides indicate the presence of halogens in the organic compound. (It does not tell which halogen is actually present).

Topic: Chemistry, General Organic Chemistry, NEET
Below critical micelle concentration (CMC)

Options:
A salt behaves as normal electrolyte
B substance like grease, fat dissolve by emulsification
C the viscosity of solution is very high
D surfactant molecules undergo association to form cluster

The correct answer is:
salt behaves as normal electrolyte

Solution:
Below critical micelle concentration (CMC) salt behaves has normal electrolyte. Micelle formation is possible only above CMC and craft temperature.

Topic: Chemistry, Surface Chemistry, NEET
Below diagram showing a technique for the culture of plants. This technique has been successfully employed for the production of which of the following?

Options:
A Tomato, Apple, Guava and Fig
B Cucumber, Potato and Banyan
C Cucumber, Lettuce and Tomato
D Lettuce, Apple, Potato and Mango

The correct answer is:
Cucumber, Lettuce and Tomato

Solution:
The above diagram shows the hydroponic technique. Hydroponics is a subset of hydroculture and is a method of growing plants using mineral nutrient solutions, in water, without soil. This technique has been successfully employed for the production of seedless cucumber, lettuce and tomato plants.

Topic: Biology, Mineral Nutrition, NEET
Below figure represents one of the stages of embryo development in human. Determine the row that correctly identifies the labels A and B with their respective functions.

A	B	Function of A	Function of B

(1)	Ectoderm	Endoderm	Differentiated as embryo	Get attach to the endometrium

(2)	Trophoblast	Inner cell mass	Differentiated as embryo	Get attach to the endometrium

(3)	Inner cell mass	Trophoblast	Differentiated as embryo	Get attach to the endometrium

(4)	Trophoblast	Inner cell mass	Get attach to the endometrium	Differentiated as embryo

Options:
A 1
B 2
C 3
D 4

The correct answer is:
3

Solution:
In the development of the embryonic stage, the morula staged group of cells (blastomeres) change into blastocyst. The cells within this form an outer layer called trophoblast - attaches to the endometrium of uterus. The inner cells of the structure form the inner cell mass which later differentiates into embryo proper.

Topic: Biology, Human Reproduction, NEET
Below is the image of an organic molecule that participates in the formation of a biomolecule.

In the above image of the molecule determine the element that will that the place marked by the dots (•).

Options:
A Carbon
B Nitrogen
C Phosphorus
D Sulphur

The correct answer is:
Carbon

Solution:
Living systems that we know of are constructed of various complex biomolecules like carbohydrates, proteins, nucleic acids, lipids, etc. and these biomolecules or compounds are generally in the category of organic compounds containing carbon-hydrogen bonds. Nitrogen is found majorly as part of the protein, which also has a carbon element. Phosphorus is observed in nucleic acids in the phosphate part of nucleotide. Sulphur is observed again in protein.

Topic: Chemistry, Biomolecules, NEET
Below is the representation of an electrostatic precipitator. What do the labels A, B, C and D suggest?

Options:
A A: Discharge corona, B: Negatively charged wire, C: Collection plate grounded, D: Dust Particles
B A: Dust particles, B: Discharge corona, C: Negatively charged wire, D: Collection plate grounded
C A: Negatively charged wire, B: Discharge corona, C: Collection plate grounded, D: Dust particles
D A: Collection plate grounded, B: Dust particles, C: Negatively charge wire, D: Discharge corona

The correct answer is:
A: Discharge corona, B: Negatively charged wire, C: Collection plate grounded, D: Dust Particles

Solution:
Electrostatic precipitator is widely used in removing particulate matter from air. This device has electrode wires [B] kept at several thousand volts that releases electrons by making a corona [A]. Dust particles get a net negative charge by attaching to these electrons. The collecting plates are grounded and attract the charged dust particles. The velocity of air is kept low to allow the dust to fall ultimately cleaning the air.

Topic: Biology, Environmental Issues, NEET
Bending of stem/coleoptile towards light or shoot of potted plant placed near a window is due to:

Options:
A Greater oxygen availability to the tip
B More auxin content on the shaded side
C Greater light availability to tip
D Availability of necessary warmth to the tip

The correct answer is:
More auxin content on the shaded side

Solution:
Auxin is a plant hormone that plays an important role in phototropism. It is equally distributed in the plant cells that is why they show cell elongation. Auxin concentration is found more in the shaded side than illuminated side so the plant grow more on the shaded side and bend in the direction of the light source.

Topic: Biology, Plant - Growth and Development, NEET
Bentham and Hooker have given the classification of flowering plants. This classification system was

Options:
A Artificial
B Phylogenetic
C Numerical
D Natural

The correct answer is:
Natural

Solution:
A natural classification system is based on natural affinities among the organisms and consider, not only the external features, but also internal features, like ultrastructure, anatomy, embryology, and phytochemistry. Such a classification for flowering plants was given by George Bentham and Joseph Dalton Hooker.

Topic: Biology, Plant Kingdom, NEET
Benthic organisms are affected the most by:

Options:
A light reaching the forest floor
B surface turbulence of water
C sediment characteristics of aquatic ecosystems
D water-holding capacity of soil

The correct answer is:
sediment characteristics of aquatic ecosystems

Solution:
Benthic organism are bottom dwelling forms of aquatic habitat. The sediment characteristics determine the type of benthic forms. The light reaching the forest floor, surface water turbulence and water holding capacity of soil does not affect them at all.

Topic: Biology, Ecosystem, NEET, NEET 2013 (Karnataka)
Benzaldehyde can be prepared from benzene by passing vapours of ............ and ........... in its solution in presence of catalyst mixture of aluminium chloride and cuprous chloride. The reaction is known is .......... .

Options:
A HCl, SnCl4 , Rosenmund reduction
B CO, HCl, Gattermann-Koch reaction
C CO2,H2SO4, Clemmensen reduction
D O3, alcohol, Wolff-Kishner reduction

The correct answer is:
CO, HCl, Gattermann-Koch reaction

Solution:
Benzaldehyde can be prepared from benzene by passing vapours of CO and hydrochloric acid in its solution in presence of catalyst mixture of AlCl3/CuCl . The reaction is known as Gattermann-Koch reaction.

Topic: Chemistry, Aldehydes and Ketones, NEET
Benzalkonium chloride is a

Options:
A cationic surfactant and antiseptic
B anionic surfactant and soluble in most of the organic solvents
C cationic surfactant and insoluble is most of the organic solvents
D cationic surfactant and antimalarial

The correct answer is:
cationic surfactant and antiseptic

Solution:
Benzalkonium chloride, also known as alkyl-demethylbenzylammonium chloride is nitrogenous cationic surface active belonging to the quaternary ammonium group. It is used as antiseptic.

n = 8, 10, 12, 14, 16, 18.

Topic: Chemistry, Chemistry in Everyday Life, NEET
Benzamide on reaction with POCl3 gives

Options:
A aniline
B chlorobenzene
C benzylamine
D benzonitrile

The correct answer is:
benzonitrile

Solution:
Benzamide on reaction with POCl3 give Benzonitrile.
C 6 H 5 CONH 2 → Δ POCl 3 C 6 H 5 C≡N benzonitrile

Topic: Chemistry, Amines, NEET
Benzamide on treatment with POCl3 gives

Options:
A Aniline
B Benzonitrile
C Chlorobenzene
D Benzyl amine

The correct answer is:
Benzonitrile

Solution:
POCl3 brings about dehydration of primary amide.

Topic: Chemistry, Amines, NEET
Benzene and toluene form ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at 300 K are 50.71 mm Hg and 32.06 mm Hg respectively. Calculate the mole fraction of benzene in vapour phase if 80 g of benzene is mixed with 100 g of toluene

Options:
A 2.3
B 1.4
C 0.2
D 0.6

The correct answer is:
0.6

Solution:
Correct Option is : (D)
0.6

Topic: Chemistry, Solutions, NEET
Benzene and toluene forms nearly ideal solution. At 200C , the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure (in torr) of benzene, at 200C for a solution containing 78 g of benzene and 46 g of toulene, is

Options:
A 50
B 25
C 37.5
D 53.5

The correct answer is:
50

Solution:
Let the number of moles of benzene be nA and that of toluene be nB.
nA+nB=7878+4692=1+0.5
PA=PA0XA=PA0 (nAnA+nB)
PA=PA0Ã11.5=751.5=50
The partial vapour pressure (in torr) of benzene, at 200C for a solution containing 78 g of benzene and 46 g of toulene, is 50 torr.

Topic: Chemistry, Solutions, NEET
Benzene and toulene form an ideal solution. 3 mole benzene and 2 mole toulene are added. V.P. of pure benzene and toulene are 300 & 200 mm of Hg respectively. The V.P. of the solution (in mm of Hg) is

Options:
A 500
B 250
C 260
D 440

The correct answer is:
260

Solution:
PTotal=PBXB+PTXT
XBenzene=nBntotal=33+2=35
Xtoluene=nTntotal=23+2=25
35×300+25×200=260

Topic: Chemistry, Solutions, NEET
Benzene diazonium chloride in aqueous solution decomposes as :
C 6 H 5 - N = N + Cl aq - + H 2 O aq ⟶ C 6 H 5 OH aq + N 2 g + HCl (aq)
The reaction follows first order kinetics. If pt is the pressure of N2 at constant volume and temperature corresponding to different intervals of time t and pf that after completion of the reaction, then which of the following graphs conforms to the kinetics of the reaction ?

Options:
A
B
C
D

The correct answer is:

Solution:
p f â Initial moles of C 6 H 5 N 2 + Cl - a p t â Moles of N 2 evolved at time t â Moles of C 6 H 5 N 2 + Cl - reacted
p f - p t â mole of C 6 H 5 N 2 + Cl - left at time t (a - x)
kt = 2 . 3 0 3 log a a - x
kt= 2 . 3 0 3 log p f p f - p t
kt 2.303 =log P f −log P f − P t
log p f - p t = log p f - k 2 . 3 0 3 t
Interception y axis = log pf
Slope = - k 2 . 3 0 3

Topic: Chemistry, Chemical Kinetics, NEET
Benzene diazonium chloride on boiling with dilute sulphuric acid, gives

Options:
A Toluene
B Benzoic acid
C Benzene
D Phenol

The correct answer is:
Phenol

Solution:

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Benzene diazonium chloride on heating with water gives:

Options:
A Benzene
B o-chlorophenol
C Anisole
D Phenol

The correct answer is:
Phenol

Solution:
Correct Option is : (D)
Phenol

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Benzene diazonium chloride on reaction with aniline in the presence of dilute hydrochloric acid gives

Options:
A
B
C
D

The correct answer is:

Solution:
Benzene diazonium chloride on reaction with aniline in the presence of dilute hydrochloric acid gives para-amino diazobenzene (Yellow dye).

Note : Aniline gives coupling reaction in mild acidic conditions.

Topic: Chemistry, Amines, NEET
Benzene reacts with $\mathrm{CH}_3 \mathrm{Cl}$ in the presence of anhydrous $\mathrm{AlCl}_3$ to form

Options:
A toluene
B chlorobenzene
C benzylchloride
D xylene

The correct answer is:
toluene

Solution:
Key Idea $\mathrm{CH}_3 \mathrm{Cl}$ in the presence of anhydrous $\mathrm{AlCl}_3$ acts as alkylation agent and introduces an alkyl group
This reaction is known as Friedel-Craft's alkylation of benzene.

Topic: Chemistry, Hydrocarbons, NEET, NEET 2009 (Screening)
Benzenediazonium chloride cannot be stored and is used immediately after its preparation because

Options:
A it slowly evaporates on storage
B it is very unstable and dissociates to give nitrogen
C it gets oxidised in air hence cannot be stored
D it reacts with all the containers in which it is stored

The correct answer is:
it is very unstable and dissociates to give nitrogen

Solution:
Benzene diazonium chloridenotstored and is used immediately after its preparation because it is unstable at high temperatures.

Topic: Chemistry, Amines, NEET
Benzenediazonium chloride gives electrophilic aromatic substitution with phenol in weakly basic medium. The product obtained is

Options:
A Diphenyl ether
B p- hydroxyazobenzene
C Chlorobenzene
D Benzene chloride

The correct answer is:
p- hydroxyazobenzene

Solution:
It is a diazo coupling reaction of phenol in slightly basic medium, through formation of phenoxide ion.

Topic: Chemistry, Amines, NEET
Benzoyl chloride is prepared from benzoic acid by

Options:
A Cl2, hv
B SO2Cl2
C SOCl2
D Cl2,H2O

The correct answer is:
SOCl2

Solution:
C6H5COOH+SOCl2→C6H5COCl+SO2+HCl

Topic: Chemistry, Carboxylic Acid Derivatives, NEET
Benzyl alcohol and sodium benzoate is obtained by the action of sodium hydroxide on benzaldehyde. This reaction is known as

Options:
A Perkin’s reaction
B Cannizzaro’s reaction
C Sandmeyer’s reaction
D Claisen condensation.

The correct answer is:
Cannizzaro’s reaction

Solution:
Benzaldehyde on treatment with 50% aqueous or ethanolic alkali solution undergoes Cannizzaro’s reactionlike HCHO (no α- hydrogen atom) i.e., one molecule is oxidised and one is reduced with the formation of benzoic acid and benzyl alcohol respectively.

Topic: Chemistry, Aldehydes and Ketones, NEET
BeO+C→CO+X → H 2 O Be (OH) 2 +Y
X and Y in the above sequence are respectively

Options:
A Be2C and C2H2
B Be2C and CO2
C Be2C and CH4
D Be2C and C2H6

The correct answer is:
Be2C and CH4

Solution:
Here X and Y are Be2C and CH4 respectively
BeO+C→CO+Be2C(X)
Be2C+2H2O→Be(OH)2+CH4 .

Topic: Chemistry, s Block Elements, NEET
Bernoulli's theorem is a consequence of the law of conservation of

Options:
A Angular momentum
B Mass
C Energy
D Momentum

The correct answer is:
Energy

Solution:
p+ρgh+12ρv2 = constant
It is clear that Bernoulli's theorem is a consequence of the law of conservation of energy.

Topic: Physics, Mechanical Properties of Fluids, NEET
Beryllium and aluminium exhibit many properties which are similar. But the two elements differ in

Options:
A forming polymeric hydrides
B forming covalent halides
C exhibiting maximum covalency in compounds
D exhibiting amphoteric nature in their oxides.

The correct answer is:
exhibiting maximum covalency in compounds

Solution:
Be Z=4 has maximum covalency of 4 while Al Z=13 has maximum covalency of 6. In rest other properties they behave similarly due to diagonal relationship.

Topic: Chemistry, s Block Elements, NEET
Beryllium and magnesium do not give color to flame whereas other alkaline earth metals do so. Why?

Options:
A Beryllium and magnesium have higher ionization energies compared to other alkaline earth metals.
B Beryllium and magnesium have lower ionization energies compared to other alkaline earth metals.
C Beryllium and magnesium have higher electronegativities compared to other alkaline earth metals.
D Beryllium and magnesium have lower electronegativities compared to other alkaline earth metals.

The correct answer is:
Beryllium and magnesium have higher ionization energies compared to other alkaline earth metals.

Solution:
Correct Option is : (A)
Beryllium and magnesium have higher ionization energies compared to other alkaline earth metals.

Topic: Chemistry, s Block Elements, NEET
Besides BHT and BHA, what additional substance is sometimes added to enhance their antioxidant effect?

Options:
A Sodium benzoate
B Citric acid
C Sorbic acid
D Propanoic acid

The correct answer is:
Citric acid

Solution:
Sometimes BHT and BHA, along with citric acid, are added to produce a more pronounced antioxidant effect.

Topic: Chemistry, Chemistry in Everyday Life, NEET
Besides carbon nanotubes, what are some other materials expected to play an important role in the future?

Options:
A Low-temperature superconductors
B Biodegradable polymers for packaging
C Solids with fixed positions
D Magnetic materials

The correct answer is:
Biodegradable polymers for packaging

Solution:
Biodegradable polymers for packaging are mentioned as one of the materials expected to play an important role in the future in the paragraph.

Topic: Chemistry, Solid State, NEET
Besides dilute hydrochloric acid, what else can be used to prepare dihydrogen according to the paragraph?

Options:
A Oxygen gas
B Water vapor
C Aqueous alkali
D Concentrated hydrochloric acid

The correct answer is:
Aqueous alkali

Solution:
The paragraph mentions that dihydrogen can also be prepared by the reaction of zinc with aqueous alkali.

Topic: Chemistry, Hydrogen, NEET
Besides fertilizers, what other application does nitric acid have in explosives and pyrotechnics?

Options:
A Preparation of nitroglycerin
B Etching of metals
C Pickling of stainless steel
D Preparation of trinitrotoluene and other organic nitro compounds

The correct answer is:
Preparation of trinitrotoluene and other organic nitro compounds

Solution:
The paragraph mentions that nitric acid is used in the manufacture of other nitrates for use in explosives and pyrotechnics, including trinitrotoluene and other organic nitro compounds.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Besides healthcare and welding, in what other activities are oxygen cylinders commonly used?

Options:
A Deep-sea diving
B High-altitude flying and mountaineering
C Automotive repair
D Cooking

The correct answer is:
High-altitude flying and mountaineering

Solution:
Oxygen cylinders are commonly used in high-altitude flying and mountaineering to provide supplemental oxygen at high altitudes where the oxygen concentration is lower.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Besides its use as a solvent, what other industrial applications does sulphur dioxide have?

Options:
A As a food coloring agent
B As a fuel in power plants
C In metallurgy for metal extraction
D As an anti-chlor, disinfectant, and preservative

The correct answer is:
As an anti-chlor, disinfectant, and preservative

Solution:
In addition to its use as a solvent, sulphur dioxide is employed as an anti-chlor, disinfectant, and preservative in various industrial applications. It helps remove excess chlorine and acts as a disinfectant and preservative in different processes.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Besides non-metal oxides, which oxides can also exhibit acidic character?

Options:
A Oxides of metals in high oxidation state
B Oxides of noble gases
C Oxides of alkali metals
D Oxides of alkaline earth metals

The correct answer is:
Oxides of metals in high oxidation state

Solution:
The paragraph mentions that, in addition to non-metal oxides, oxides of some metals in high oxidation states, such as Mn2O7, CrO3, and V2O5, can also exhibit acidic character.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Besides paddy fields, cyanobacteria are also found inside vegetative part of

Options:
A Pinus
B Cycas
C Equisetum
D Psilotum

The correct answer is:
Cycas

Solution:
Cyanobacteria within the coralloid roots of Cycas are chemoheterotrophic and specifically adapted to life in symbiosis. Only a few species of cyanobacteria form associations with Cycas. Pinus is a gymnosperm. Equisetum belongs to vascular plants and to horse tail family. Psilotum belongs to division-Pteridophyta and is a fern like plant.

Topic: Biology, Plant Kingdom, NEET, NEET 2013 (All India)
Besides signals, where else is phosphine used?

Options:
A In fireworks
B In refrigeration
C In smoke screens
D In water purification

The correct answer is:
In smoke screens

Solution:
The paragraph mentions that phosphine is used in smoke screens in addition to its use in signals.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Besides sodium benzoate, what other salts are used as food preservatives?

Options:
A Table salt and propanoic acid
B Sorbic acid and sodium chloride
C Sorbic acid and propanoic acid
D Vegetable oils and sugar

The correct answer is:
Sorbic acid and propanoic acid

Solution:
Salts of sorbic acid and propanoic acid are also used as food preservatives.

Topic: Chemistry, Chemistry in Everyday Life, NEET
Besides sodium hypobromite, what other halogen reagent can be used for the haloform reaction to detect specific functional groups?

Options:
A Sodium hypochlorite
B Sodium iodide
C Sodium cyanide
D Sodium fluoride

The correct answer is:
Sodium iodide

Solution:
Besides sodium hypobromite, sodium iodide can also be used for the haloform reaction to detect specific functional groups, such as the CH3CO group or CH3CH(OH) group.

Topic: Chemistry, Aldehydes, Ketones and Carboxylic Acids, NEET
Besides structural classification, how else can organic compounds be classified?

Options:
A Based on their color
B Based on their odor
C Based on their functional groups
D Based on their solubility in water

The correct answer is:
Based on their functional groups

Solution:
Organic compounds can also be classified on the basis of functional groups.

Topic: Chemistry, General Organic Chemistry, NEET
Besides the aufbau principle, what other principles are considered when filling electrons into orbitals?

Options:
A Bohr's principle and Heisenberg's principle
B Pauli's exclusion principle and Hund's rule
C Rutherford's principle and Planck's principle
D Schrödinger's principle and Thomson's principle

The correct answer is:
Pauli's exclusion principle and Hund's rule

Solution:
the filling of electrons into orbitals is based on the aufbau principle, Pauli's exclusion principle, Hund's rule of maximum multiplicity, and the relative energies of the orbitals.

Topic: Chemistry, Structure of Atom, NEET
Besides the manufacture of soap and textiles, name one other industrial application of sodium hydroxide.

Options:
A Food production
B Electronics manufacturing
C Water treatment
D Construction

The correct answer is:
Water treatment

Solution:
Sodium hydroxide is used in water treatment processes as well as in various other industrial applications.

Topic: Chemistry, s Block Elements, NEET
Best defined function of manganese in green plants is

Options:
A photolysis of water
B Calvin cycle
C nitrogen fixation
D water absorption

The correct answer is:
photolysis of water

Solution:
Photolysis of water requires light energy, an Oxygen Evolving Complex (OEC) and electron carrier 1/2. OEC complex was formerly called Z-enzyme. It has four Mn ions. Light energy brings about changes in $\mathrm{Mn}\left(\mathrm{Mn}^{+2}, \mathrm{Mn}^{3+}, \mathrm{Mn}^{+4}\right)$ which helps in removing electrons from $\mathrm{OH}^{-}$component of water forming oxygen. Liberation of oxygen also requires $\mathrm{Cl}^{-}$and $\mathrm{Ca}^{+2}$.

Topic: Biology, Mineral Nutrition, NEET, NEET 2012 (Screening)
Best material for the study of mitosis in laboratory is:

Options:
A anther
B root tip
C leaf tip
D ovary

The correct answer is:
root tip

Solution:
Root tips are the best to study mitosis. It is characteristic of meristematic cells present at the tip of the roots that provide the most suitable and sufficient raw material to study the different mitosis stages. Anther shows meiotic divisions mostly.
Related Theory
Onion is a monocot plant and is the most commonly used root tip to study mitosis.

Topic: Biology, Morphology of Flowering Plants, NEET, NEET 2002
Between C (Carbon) and CO (Carbon Monoxide), which is a better reducing agent for ZnO?

Options:
A Carbon [C]
B Carbon Monoxide [CO]
C Both are equally effective
D Neither is effective as a reducing agent for ZnO

The correct answer is:
Carbon Monoxide [CO]

Solution:
Correct Option is : (B)
Carbon Monoxide [CO]

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET