datavorous/entrance-exam-dataset huggingface dataset:
Which of the following pairs is an example of a positive deviation from Raoult's law?

Options:
A Water-hydrochloric acid
B Water-nitric acid
C Benzene-methanol
D Acetone-chloroform

The correct answer is:
Benzene-methanol

Solution:
In solution showing positive type of deviation the partial pressure of each component of solution is greater than the vapour pressure as expected according to Raoult’s law.
In solution of methanol and benzene methanol molecules are held together due to hydrogen bonding as shown below. On adding benzene, the benzene molecules get in between the molecule of methanol thus breaking the hydrogen bonds. As the resulting solution has weak intermolecular attraction, the escaping tendency of alcohol and benzene molecule from the solution increases. Consequently the vapour pressure of the solution is greater than the vapour pressure as expected from Raoult’s law.

Topic: Chemistry, Solutions, NEET
Which of the following pairs is an example of the sedimentary type of biogeochemical cycle?

Options:
A Oxygen and nitrogen
B Phosphorus and sulphur
C Phosphorus and nitrogen
D Phosphorus and carbon dioxide

The correct answer is:
Phosphorus and sulphur

Solution:
Biogeochemical cycles are of two types:
(a) Gaseous: Biological elements involved in circulation are gases, e.g., N2, O2, CO2, etc.
(b) Sedimentary: Biological elements involved in circulation are non-gaseous, e.g. P, Ca, S, etc., that form rocks.

Topic: Biology, Ecosystem, NEET
Which of the following pairs is an incorrect match?

Options:
A Annelids and arthropods-Bilateral symmetry
B Sponges-Acoelomates
C Coelenterates and Ctenophores-Radial symmetry
D Platyhelminthes-Diploblastic organisation

The correct answer is:
Platyhelminthes-Diploblastic organisation

Solution:
The correct answer is option (4) as it represents an incorrect match because platyhelminthes are triploblastic organisms; not diploblastic.
Option (1) represents the correct match as annelids and arthropods exhibit bilateral symmetry.
Option (2) represents the correct match as sponges are acoelomates.
Option (3) represents the correct match as coelenterates and ctenophores exhibit radial symmetry. Hence, option (1), (2) and (3) cannot be the answer.

Topic: Biology, Animal Kingdom, NEET, NEET 2024 (Re-NEET)
Which of the following pairs, is correctly matched?

Options:
A hinge joint - between vertebrae
B gliding joint - between zygapophyses of the successive vertebrae
C cartilaginous joint - skull bones
D fibrous joint $\quad-$ between phalanges.

The correct answer is:
gliding joint - between zygapophyses of the successive vertebrae

Solution:
Gliding joints occur between the carpal bones, between the tarsal bones and those between the articular processes (zygapophyses) of successive vertebrae.

Topic: Biology, Locomotion and Movement, NEET, NEET 2005
Which of the following pairs is correctly matched?

Options:
A Uricotelism - aquatic habitat
B Parasitism - intra-specific relationship
C Excessive perspiration - xeric adaptation
D Stream lined body - aquatic adaptation

The correct answer is:
Stream lined body - aquatic adaptation

Solution:
The correctly matched pair is streamlined body for aquatic adaptation.
Parasitism-inter specific relationship in which one species (parasite) benefits for growth and reproduction and ollic species (host) harmed. Parasite live on or inside the body of host.

Topic: Biology, Organisms and Populations, NEET
Which of the following pairs is incorrectly matched?

Options:
A Genetic code-unambiguous
B Okazaki fragments-Splicing
C RNA polymerase-RNA primer
D Restriction enzymes-Genetic engineering

The correct answer is:
Okazaki fragments-Splicing

Solution:
Okazaki fragments are the short nucleotide stretches synthesized on the lagging strand of DNA. Splicing is the mechanism of removal of non-coding sequences from pre-mRNA and joining of coding sequences with the formation of mature RNA.

Topic: Biology, Molecular Basis of Inheritance, NEET
Which of the following pairs is not correctly matched with respect to their mode of reproduction?

Options:
A Rhizome: Banana
B Binary fission: Sargassum
C Conidia: Penicillium
D Offset: Water hyacinth

The correct answer is:
Binary fission: Sargassum

Solution:
Sargassum reproduces asexually by fragmentation. Binary fission is observed in amoeba, yeasts, etc.

Topic: Biology, Reproduction in Organisms, NEET, NEET 2015 (Phase 2)
Which of the following pairs is not correctly matched with respect to their mode of reproduction?

Options:
A Rhizome: Banana
B Binary fission: Sargassum
C Conidia: Penicillium
D Offset: Water hyacinth

The correct answer is:
Binary fission: Sargassum

Solution:
Sargassum reproduces asexually by fragmentation. Binary fission is observed in amoeba, yeasts, etc.

Topic: Biology, Reproduction in Organisms, NEET
Which of the following pairs is of unicellular algae?

Options:
A Gelidium and Gracilaria
B Anabaena and Volvox
C Chlorella and Spirulina
D Laminaria and Sargassum

The correct answer is:
Chlorella and Spirulina

Solution:
The form and size of algae vary considerably. They are as follows:

Unicellular: Chlorella, Spirulina, etc.

Multicellular: Gracilaria, Gelidium, etc.

Branched: Laminaria

Colonial: Volvox

Filamentous: Ulothrix, Anabaena, Spirogyra.

Topic: Biology, Plant Kingdom, NEET, NEET 2020 (Phase 1)
Which of the following pairs is wrong?

Options:
A Uricotelic ---------- Birds
B Ureotelic ---------- Insects
C Ammonotelic ---------- Tadpole
D Ureotelic ---------- Elephant

The correct answer is:
Ureotelic ---------- Insects

Solution:
Insects are uricotelic.

Topic: Biology, Excretory Products and their Elimination, NEET
Which of the following pairs is wrongly matched?

Options:
A XO type sex determination : Grasshopper
B ABO blood grouping : Co-dominance
C Starch synthesis in pea: Multiple alleles
D T.H. Morgan : Linkage

The correct answer is:
Starch synthesis in pea: Multiple alleles

Solution:
Starch synthesis in pea is an example of incomplete dominance. When the dominant allele is not completely able to mask the expression of a recessive allele it is called incomplete dominanace. The gene for starch synthesis in pea seeds has two alleles B and b. In BB genotype, large starch grains are produced. After maturation the seeds are round. In bb homozygous condition, smaller starch grains are produced and mature seeds are wrinkled. Bb heterozygous form round seeds so that B seems to be dominant allele. However, Bb seeds have starch grains of intermediate size, showing incomplete dominance.

Topic: Biology, Principles of Inheritance and Variation, NEET, NEET 2018
Which of the following pairs of a chemicals reaction is certain to result in a spontaneous reactions?

Options:
A Exothermic and increasing disorder
B Exothermic and decreasing disorder
C Endothermic and increasing disorder
D Endothermic and decreasing disorder

The correct answer is:
Exothermic and increasing disorder

Solution:
For spontaneous reaction $\Delta \mathrm{H}=-v e$, $\Delta \mathrm{S}=+v e$
Related Theory
When the reaction is exothermic (negative $\triangle H$ ) but undergoes a decrease in entropy (negative $\Delta S)$, it is the enthalpy term which favours the reaction. In this case, a spontaneous reaction is dependent upon the TAS term being small relative to the $\Delta H$ term, so that $\triangle G$ is negative. The freezing of water is an example of this type of process. It is spontaneous only at a relatively low temperature. Above $273 \mathrm{~K}$, the larger $T \Delta S$ value causes the sign of $\triangle G$ to be positive, and freezing does not occur.
Caution
Students usually confuse the term spontaneous with the notion that a reaction occurs rapidly. A spontaneous reaction is one in which product formation is favoured, even if the reaction is extremely slow.

Topic: Chemistry, Thermodynamics (C), NEET, NEET 2005
Which of the following pairs of after effects are considered to be consequences of the Green Revolution?

Options:
A waterlogging and soil salinity
B soil erosion and desertification
C deforestation and Jhum cultivation
D ozone depletion and global warming

The correct answer is:
waterlogging and soil salinity

Solution:
Irrigation without proper drainage of water leads to waterlogging in the soil. Besides affecting the crops, waterlogging draws salt to the surface of the soil. The salt then is deposited as a thin crust on the land surface or starts collecting at the roots of the plants. This increased salt content is inimical to the growth of crops and is extremely damaging to agriculture. Waterlogging and soil salinity are some of the problems that have come in the wake of the Green Revolution.

Topic: Biology, Environmental Issues, NEET
Which of the following pairs of animals has non-glandular skin

Options:
A Snake and Frog
B Chameleon and Turtle
C Frog and Pigeon
D Crocodile and Tiger

The correct answer is:
Chameleon and Turtle

Solution:
Chameleon and Turtle has non-glandular skin.

Topic: Biology, Animal Kingdom, NEET
Which of the following pairs of complexes are isomeric with each other but their aqueous solutions exhibit different molar conductivities?

Options:
A [PtCl2(NH3)4]Br2 and [PtBr2(NH3)4]Cl2
B [Pt(OH)2(NH3)4]SO4 and [PtSO4(NH3)4](OH)2
C K3[Fe(CN)2] and K4[Fe(CN)6]
D [Co(NH3)5Br]SO4 and [Co(NH3)5SO4]Br

The correct answer is:
[Co(NH3)5Br]SO4 and [Co(NH3)5SO4]Br

Solution:
[Co(NH3)5Br]SO4 and [Co(NH3)5SO4]Br are ionisation isomers but their molar conductivity is different due to different magnitude of charge on the cation and anion respectively as follows
[Co(NH3)5Br]SO4→[Co(NH3)5Br]2++SO42-
[Co(NH3)5SO4]Br→[Co(NH3)5SO4]++Br-

Topic: Chemistry, Coordination Compounds, NEET
Which of the following pairs of compounds are enantiomers?

Options:
A

B

C

D

The correct answer is:

Solution:
Enantiomers rotate plane polarized light direction to equal, but opposite angles, and interact differently with other chiral molecules. Enantiomers are stereoisomers that are nonsuperimposable mirror images. A molecule with 1 chiral carbon atom exists as 2 stereoisomers termed enantiomers. Enantiomers differ in their configuration ($\mathrm{R}$ or $\mathrm{S})$ at the stereogenic centre.

Topic: Chemistry, General Organic Chemistry, NEET, NEET 2003
Which of the following pairs of compounds are enantiomers?

Options:
A
B
C
D

The correct answer is:

Solution:
These two are non-superimposable mirror images of each other, so they are enantiomers.

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following pairs of compounds are position isomers?

Options:
A Isobutyl alcohol and s-butyl alcohol
B Isobutyl alcohol and t-butyl alcohol
C Isopentyl alcohol and neopentyl alcohol
D Ethyl alcohol and ethylene glycol

The correct answer is:
Isobutyl alcohol and t-butyl alcohol

Solution:
→ along same C-chain, position of group will be differ.
→ They become position isomer.

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following pairs of compounds are ring-chain isomers?

Options:
A
B
C
D

The correct answer is:

Solution:
-they doesnot have same molecular formula.
- they are functional isomers.
- both have molecular formula
- they are chain isomers

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following pairs of compounds is isoelectronic and isostructural?

Options:
A BeCl2, XeF2
B TeI2, XeF2
C IBr2-, XeF2
D IF3, XeF2

The correct answer is:
IBr2-, XeF2

Solution:
(i) IBr 2 −
number of the electron in the valence shell =7+7+7+1=22
(ii) BeCl 2
sp 3 d hybridised (linear).
Number of the electron in the valence shell =2+7+7=16
(iii) XeF 2
number of electron in valence shell =8+7+7=22
(iv) TeI 2
number of the electron in the valence shell = 6+7+7=24
(v) IF 3
number of the electron in the valence shell =7+7+7+7=28
IBr 2 − and XeF 2 both are isostructural and isoelectronic.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET, NEET 2017
Which of the following pairs of countries have taken up the initiative to introduce ecological sanitation in several areas?

Options:
A USA and Canada
B India and Sri Lanka
C Spain and Germany
D Sri Lanka and Myanmar

The correct answer is:
India and Sri Lanka

Solution:
Ecological sanitation is a sustainable system for handling human excreta, using dry composting toilets. This is a practical, hygienic, efficient and cost-effective solution to human waste disposal. The key point to note here is that with this composting method, human excreta can be recycled into a resource (as natural fertiliser), which reduces the need for chemical fertilisers. There are working âEcoSanâ toilets in many areas of Kerala and Sri Lanka.

Topic: Biology, Environmental Issues, NEET
Which of the following pairs of d-orbitals will have the electron density along the axis?

Options:
A dz2, dxz
B dxz, dyz
C dz2, dx2-y2
D dxy, dx2-y2

The correct answer is:
dz2, dx2-y2

Solution:
Those orbitals which have electron densities towards the particular axis are known as axial orbitals. Here, dz2 & dx2-y2 are given. They have electron densities towards the particular axis.

Topic: Chemistry, Structure of Atom, NEET, NEET 2016 (Phase 2)
Which of the following pair/s of elements is/are correctly matched ?

a. Eka Silicon-Ge

b. Eka Aluminium-Ga

c. Eka Mangnese-Te

Options:
A a, b, c
B a, b
C a, c
D b, c

The correct answer is:
a, b

Solution:
Eka Silicon-Ge (Germanium)
Eka Aluminium-Ga (Gallium)
Eka Mangnese-Tc (Technetium)

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which of the following pairs of elements show diagonal relationship?
1. Li and Mg 2. B and Si 3. Mg and Al
Select the correct answer using the codes given below

Options:
A 1 and 3
B 2 and 3
C 1 and 2
D 1, 2 and 3

The correct answer is:
1 and 2

Solution:
The first element of a group (elements of second row) often show resemblance with the second element of the next group.
This similarity arises because of their comparable (i) electronegativities, (ii) ionization energies, (iii) polarizing powers (charge/radius ratios).

Topic: Chemistry, s Block Elements, NEET
Which of the following pairs of elements would have a more negative electron gain enthalpy between Fluorine and Chlorine?

Options:
A Fluorine
B Chlorine
C Both Chlorine and Fluorine have the same electron gain enthalpy.
D It is impossible to determine without additional information.

The correct answer is:
Chlorine

Solution:
Correct Option is : (B)
Chlorine

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which of the following pairs of elements would have a more negative electron gain enthalpy between Oxygen and Fluorine?

Options:
A Oxygen
B Fluorine
C Both Oxygen and Fluorine have the same electron gain enthalpy.
D It is impossible to determine without additional information.

The correct answer is:
Fluorine

Solution:
Correct Option is : (B)
Fluorine

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which of the following pairs of hormones are not antagonistic (having opposite effects) to each other?

Options:
A Parathormone - Calcitonin
B Insulin - Glucagon
C Aldosterone - Atrial Natriuretic Factor
D Relaxin - Inhibin

The correct answer is:
Relaxin - Inhibin

Solution:
Parathormone → Increases blood Ca+2 level
Calcitonin → Decreases blood Ca+2 level
Insulin → Decreases blood glucose level
Glucagon → Increases blood glucose level
Aldosterone → Increases B.P.
ANF → Decreases B.P.
Relaxin → Causes pelvic musculature relaxation
Inhibin → Inhibits FSH

Topic: Biology, Chemical Coordination and Integration, NEET, NEET 2016 (Phase 1)
Which of the following pairs of hormones are not antagonistic (having opposite effects) to each other?

Options:
A Parathormone - Calcitonin
B Insulin - Glucagon
C Aldosterone - Atrial Natriuretic Factor
D Relaxin - Inhibin

The correct answer is:
Relaxin - Inhibin

Solution:
Parathormone → Increases blood Ca+2 level
Calcitonin → Decreases blood Ca+2 level
Insulin → Decreases blood glucose level
Glucagon → Increases blood glucose level
Aldosterone → Increases B.P.
ANF → Decreases B.P.
Relaxin → Causes pelvic musculature relaxation
Inhibin → Inhibits FSH

Topic: Biology, Chemical Coordination and Integration, NEET
Which of the following pairs of ions are isoelectronic and isostructural?

Options:
A CO32-,SO32-
B SO32-,NO3-
C ClO3-,SO32-
D ClO3-,CO32-

The correct answer is:
ClO3-,SO32-

Solution:
ClO3-	SO32-

Number of e-	42	42

hybridisation	sp3	sp3

both are having three bond pair & one lone pair of electrons on central atom hence they are pyramidal in shapes.
As both are having 42 electrons and pyramidal shape so, they are isoelectronic and isostructural.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following pairs of ions is isoelectronic and isostructural?

Options:
A CO32-, NO3-
B ClO3-, CO32-
C SO32-, NO3-
D ClO2-, SO32-

The correct answer is:
CO32-, NO3-

Solution:
Molecules contain the same number of electrons are known as isoelectronic species and those have same shape known as isostructural. Above two compounds, Both have 32 electrons with trigonal planar structure.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET, NEET 2016 (Phase 2)
Which of the following pairs of ions will have same spin only magnetic moment values within the pair?
A. $\mathrm{Zn}^{2+}, \mathrm{Ti}^{2+}$
B. $\mathrm{Cr}^{2+}, \mathrm{Fe}^{2+}$
C. $\mathrm{Ti}^{3+}, \mathrm{Cu}^{2+}$
D. $\mathrm{V}^{2+}, \mathrm{Cu}^{+}$
Choose the correct answer from the options given below

Options:
A C and D only
B A and D only
C A and B only
D B and C only

The correct answer is:
B and C only

Solution:
Magnetic moment $\mu=\sqrt{n(n+2)} B M$
$\mathrm{n} \Rightarrow$ Number of unpaired electrons
Hence $\left(\mathrm{Cr}^{2+}, \mathrm{Fe}^{2+}\right)$ and $\left(\mathrm{Ti}^{3+}, \mathrm{Cu}^{2+}\right)$ are the pair of same magnetic moment.

Topic: Chemistry, Structure of Atom, NEET, NEET 2024 (Re-NEET)
Which of the following pairs of iron are isoelectronic and isostructural?

Options:
A CO32-,Â SO32-
B ClO3-, CO32-
C SO32-,Â NO3-
D ClO3-, SO32-

The correct answer is:
ClO3-, SO32-

Solution:
Isoelectronic (same no of electrons)
ClO3- & SO32-â17+24+1=42
and 16+24+2=42
Isostructural (same type of hybridization)
ClO3-âH=127+1=4 sp3
SO32-âH=126+2=4 (sp3)

Topic: Chemistry, Structure of Atom, NEET, NEET 2015 (Phase 1)
Which of the following pairs of Lewis structure represent resonance contributor to the species?

Options:
A
B
C
D

The correct answer is:

Solution:
Here the two resonating structures are
All other involves movement of atoms which is not allowed in resonance so they are not resonating structures.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following pairs of metals is purified by van Arkel method?

Options:
A $\mathrm{Zr}$ and Ti
B $\mathrm{Ag}$ and $\mathrm{Au}$
C $\mathrm{Ni}$ and Fe
D Ga and In

The correct answer is:
$\mathrm{Zr}$ and Ti

Solution:
$\mathrm{Zr}$ and Ti are purified by van Arkel method.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET, NEET 2011 (Screening)
Which of the following pairs of muscles undergo contraction during the process of inspiration in human?

Options:
A Phrenic muscle of diaphragm and external inter-costal muscles
B Phrenic muscle of diaphragm and internal inter-costal muscles
C External inter-costal and internal inter-costal muscles
D Abdominal muscles and external inter-costal muscles

The correct answer is:
Phrenic muscle of diaphragm and external inter-costal muscles

Solution:
During the process of inspiration, the phrenic muscle of diaphragm contract so that the dome shaped diaphragm become flattened/contracted and the external inter-costal muscles also contracted to increase the volume of thoracic chamber and decreases the pulmonary pressure than outside.

Topic: Biology, Breathing and Exchange of Gases, NEET
Which of the following pairs of physical quantities does not have same dimensional formula ?

Options:
A Work and torque
B Angular momentum and Planck's constant
C Tension and surface tension
D Impulse and linear momentum

The correct answer is:
Tension and surface tension

Solution:
The pairs of physical quantities does not have same dimensional formula tension and surface tension
[ Tension ]=[ MLT -1 ]
[ Surface Tension ]=[ ML 0 T -2 ]

Topic: Physics, Units and Dimensions, NEET
Which of the following pairs of plants represents Conifers?

Options:
A Cycas and Ginkgo
B Pinus and Cedrus
C Pinus and Eucalyptus
D Cycas and Wolffia

The correct answer is:
Pinus and Cedrus

Solution:
Conifers are gymnosperms which grow in a temperate area with the branched stem. In conifers, the needle-like leaves reduce the surface area. Conifers include Pinus and Cedrus. Cycas and Ginkgo are gymnosperms but not conifers. Eucalyptus and Wolffia are angiosperms

Topic: Biology, Plant Kingdom, NEET
Which of the following pairs of substances are found inside a mitochondrion?

Options:
A Single RNA molecule and 50S ribosomes
B Single DNA molecule and 50S ribosomes
C Single RNA molecule and 70S ribosomes
D Single DNA molecule and 70S ribosomes

The correct answer is:
Single DNA molecule and 70S ribosomes

Solution:
The matrix also possesses single circular DNA molecule, a few RNA molecules, ribosomes (70S) and the components required for the synthesis of proteins.

Topic: Biology, Cell - The Unit of Life, NEET
Which of the following pairs represents constitutional isomers?

Options:
A
B CH3CH=CH2 and CH2=CHCH3
C
D

The correct answer is:

Solution:
These isomers have different positions of bromides hence, positional isomers.
Compounds in option A are ring chain are not isomer as their molecular formula differ.
Compounds in option B are same compounds.
Compounds in option C are geometrical isomers.

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following pairs represents constitutional isomers?

Options:
A 2-methylbutane and pentane
B Propyl chloride and isopropyl chloride
C 2-chlorohexane and 3-chlorohexane
D All of the above

The correct answer is:
All of the above

Solution:
Here all the given pairs are examples of constitutional isomers (structural isomers) as follows

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following pairs represents linkage isomers?

Options:
A PdPPh32NCS2 and PdPPh32SCN2
B Co NH 3 5 NO 3 SO 4 âandâ Co NH 3 5 SO 4 NO 3
C PtCl2NH34Br2 and PtBr2NH34Cl2
D CuNH34PtCl4 and PtNH34CuCl4

The correct answer is:
PdPPh32NCS2 and PdPPh32SCN2

Solution:
As NCS- is an ambidentate ligand and it can be linked through N or S so it is capable of showing linkage isomerism so PdPPh32NCS2 and PdPPh32SCN2 are linkage isomers.

Topic: Chemistry, Coordination Compounds, NEET
Which of the following parameters are responsible for increasing and decreasing the size of the population?

Options:
A natality and mortality
B mortality and natality
C natality + immigration and mortality + emigration
D natality + emigration and mortality + immigration

The correct answer is:
natality + immigration and mortality + emigration

Solution:
Population density will increase if the number of births plus the number of immigrants (B+I) is more than the number of deaths plus the number of emigrants (D+E). Under normal conditions, births and deaths are the most important factors influencing population density, the other two factors assuming importance only under special conditions. For instance, if a new habitat is just being colonized, immigration may contribute more significantly to population growth than birth rates.

Topic: Biology, Organisms and Populations, NEET