datavorous/entrance-exam-dataset huggingface dataset:
Why do animals perform locomotion?

Options:
A To find food
B To find shelter
C To find a mate
D All of the above

The correct answer is:
All of the above

Solution:
Animals perform locomotion for the search of food, shelter, mate, suitable breeding grounds, favourable climatic conditions or to escape from enemies/predators.

Topic: Biology, Locomotion and Movement, NEET
Why do aromatic carboxylic acids not undergo Friedel-Crafts reactions?

Options:
A The carboxyl group is activating.
B The carboxyl group is ortho-directing.
C The carboxyl group is meta-directing.
D The carboxyl group is a strong Lewis acid.

The correct answer is:
The carboxyl group is meta-directing.

Solution:
Aromatic carboxylic acids do not undergo Friedel-Crafts reactions because the carboxyl group is a deactivating and meta-directing group. Additionally, the Lewis acid catalyst, aluminum chloride, gets bonded to the carboxyl group.

Topic: Chemistry, Aldehydes, Ketones and Carboxylic Acids, NEET
Why do atoms combine?

Options:
A To form molecules
B To attain stability
C To lower the energy of the system
D To achieve a definite shape

The correct answer is:
To attain stability

Solution:
Atoms combine because they have a tendency to attain the stable electronic configuration octet structure of the nearest noble gas in the periodic table.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Why do beryllium and magnesium appear kinetically inert to oxygen and water?

Options:
A They have a strong aversion to oxygen and water.
B They have a protective oxide film on their surface.
C They are naturally non-reactive elements.
D They have a high electronegativity.

The correct answer is:
They have a protective oxide film on their surface.

Solution:
Beryllium and magnesium have a thin oxide film on their surfaces that prevents further reaction with oxygen and water, making them appear kinetically inert.

Topic: Chemistry, s Block Elements, NEET
Why do beryllium and magnesium not impart any color to a flame during a flame test?

Options:
A They have low ionization energies
B They have strongly bound electrons
C They have high melting points
D They have small atomic sizes

The correct answer is:
They have strongly bound electrons

Solution:
Beryllium and magnesium have electrons that are too strongly bound to get excited by a flame, so they do not impart any color to the flame during a flame test.

Topic: Chemistry, s Block Elements, NEET
Why do beryllium and magnesium not impart color to the flame in the flame test?

Options:
A Because they have a lower ionization energy compared to other alkaline earth metals.
B Because the energy of the Bunsen flame is too high to excite their electrons.
C Because they are larger in size than other alkaline earth metals.
D Because they have a high affinity for flame colors.

The correct answer is:
Because the energy of the Bunsen flame is too high to excite their electrons.

Solution:
Correct Option is : (B)
Because the energy of the Bunsen flame is too high to excite their electrons.

Topic: Chemistry, s Block Elements, NEET
Why do birds living in nature lay eggs only seasonally?

Options:
A For human welfare
B To follow a natural cycle
C To lay more eggs in a year
D None of the above

The correct answer is:
To follow a natural cycle

Solution:
Birds living in nature lay eggs only seasonally because of their natural cycle.

Topic: Biology, Reproduction in Organisms, NEET
Why do chlorine oxides tend to be highly reactive and can even explode?

Options:
A Due to the multiple bond formation between chlorine and oxygen
B Due to the availability of d-orbitals in chlorine
C Due to greater polarisability of the bond between chlorine and oxygen
D Due to the middle row anomaly

The correct answer is:
Due to the multiple bond formation between chlorine and oxygen

Solution:
Chlorine oxides tend to be highly reactive and can even explode due to the multiple bond formation between chlorine and oxygen.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Why do chromium and copper have five and ten electrons in the 3d orbitals, respectively, instead of four and nine as expected based on their position?

Options:
A They violate the Aufbau principle.
B They have fully filled 4s orbitals.
C They have half-filled 4s orbitals.
D Fully filled and half-filled orbitals have extra stability.

The correct answer is:
Fully filled and half-filled orbitals have extra stability.

Solution:
The fully filled and half-filled orbitals have extra stability, which is why chromium and copper adopt the d5 and d10 configurations.

Topic: Chemistry, Structure of Atom, NEET
Why do colloidal solutions show values of colligative properties of a small order?

Options:
A Because the particles are smaller than true solutions
B Because the particles are larger aggregates
C Because the number of particles is smaller
D Because the number of particles is larger

The correct answer is:
Because the number of particles is smaller

Solution:
Colloidal solutions show values of colligative properties of a small order because the number of particles in a colloidal solution is comparatively small as compared to a true solution.

Topic: Chemistry, Surface Chemistry, NEET
Why do compounds having similar geometry have different magnetic moments?

Options:
A Varied electron spin orientations in different compounds.
B Presence of different central atoms in each compound.
C Differences in the ligands surrounding the central atom.
D Variation in the number of unpaired electrons.

The correct answer is:
Variation in the number of unpaired electrons.

Solution:
Correct Option is : (D)
Variation in the number of unpaired electrons.

Topic: Chemistry, Coordination Compounds, NEET
Why do different particles in a gas have different speeds and kinetic energies?

Options:
A Due to a loss of kinetic energy
B Because they have different masses
C As a result of molecular collisions
D Because of changes in temperature

The correct answer is:
As a result of molecular collisions

Solution:
Different particles in a gas have different speeds and kinetic energies because of the collisions they undergo.

Topic: Chemistry, States of Matter, NEET
Why do drugs classified on the basis of chemical structure often have similar pharmacological activity?

Options:
A Because they have the same color
B Because they have the same origin
C Because they share common structural features
D Because they are all derived from natural sources

The correct answer is:
Because they share common structural features

Solution:
The drugs classified based on chemical structure often have similar pharmacological activity because they share common structural features.

Topic: Chemistry, Chemistry in Everyday Life, NEET
Why do elastomers possess elastic properties?

Options:
A Elastomers are naturally occurring materials with inherent elasticity.
B Elastomers have a rigid molecular structure that makes them highly flexible.
C Elastomers contain a high concentration of metal ions, which give them their elasticity.
D Elastomers possess elastic properties because the intermolecular forces are the weakest. As a result, they can regain their original shape when the stress is removed.

The correct answer is:
Elastomers possess elastic properties because the intermolecular forces are the weakest. As a result, they can regain their original shape when the stress is removed.

Solution:
Correct Option is : (D)
Elastomers possess elastic properties because the intermolecular forces are the weakest. As a result, they can regain their original shape when the stress is removed.

Topic: Chemistry, Polymers, NEET
Why do electrophilic substitution reactions in haloarenes require more drastic conditions compared to benzene?

Options:
A Due to the absence of resonance
B Due to the presence of an electron-donating group
C Due to the increased electron density
D Due to the deactivation of the ring by the halogen atom

The correct answer is:
Due to the deactivation of the ring by the halogen atom

Solution:
Electrophilic substitution reactions in haloarenes require more drastic conditions because the halogen atom deactivates the ring compared to benzene.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Why do elements in the same group have similar physical and chemical properties?

Options:
A Because they have the same number of protons.
B Because they have the same atomic mass.
C Because they have the same number of neutrons.
D Because they have the same number of valence electrons.

The correct answer is:
Because they have the same number of valence electrons.

Solution:
Correct Option is : (D)
Because they have the same number of valence electrons.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Why do fast jets of water gush through the openings between our fingers when we try to close a water tap with our fingers?

Options:
A The pressure of the water increases due to the constriction created by the fingers.
B Fingers create a turbulence that accelerates water flow.
C Water taps are designed to work this way.
D The equation of continuity states that for an opening with a smaller area, velocity is higher.

The correct answer is:
The equation of continuity states that for an opening with a smaller area, velocity is higher.

Solution:
Correct Option is : (D)
The equation of continuity states that for an opening with a smaller area, velocity is higher.

Topic: Chemistry, Mechanical Properties of Fluids, NEET
Why do [Fe(CN)6]4–and [Fe(H2O)6]2+have different colours in dilute solutions?

Options:
A The colour of a coordination compound depends on CFSE, CN−is a strong field ligand having a higher CFSE value as compared to the CFSE value of water.
B [Fe(CN)6]4–appears green, while [Fe(H2O)6]2+appears yellow due to differences in ligand field splitting.
C Both [Fe(CN)6]4–and [Fe(H2O)6]2+appear colourless in dilute solutions.
D The colour difference is due to differences in the coordination number of the iron ion.

The correct answer is:
The colour of a coordination compound depends on CFSE, CN−is a strong field ligand having a higher CFSE value as compared to the CFSE value of water.

Solution:
Correct Option is : (A)
The colour of a coordination compound depends on CFSE, CN−is a strong field ligand having a higher CFSE value as compared to the CFSE value of water.

Topic: Chemistry, Coordination Compounds, NEET
Why do gases always tend to be less soluble in liquids as the temperature is raised?

Options:
A Increasing temperature causes gases to dissociate into smaller particles, reducing their solubility in liquids.
B Dissolution of gas is an exothermic process. As the temperature is raised, the equilibrium shifts in reverse direction (Le-Chatelier's principle). It results in decrease of solubility of gases in liquid.
C As temperature rises, the density of the liquid decreases, making it harder for gas molecules to dissolve.
D Higher temperatures cause an increase in the polarity of liqu+ids, making them less likely to interact with gas molecules and reducing solubility.

The correct answer is:
Dissolution of gas is an exothermic process. As the temperature is raised, the equilibrium shifts in reverse direction (Le-Chatelier's principle). It results in decrease of solubility of gases in liquid.

Solution:
Correct Option is : (B)
Dissolution of gas is an exothermic process. As the temperature is raised, the equilibrium shifts in reverse direction (Le-Chatelier's principle). It results in decrease of solubility of gases in liquid.

Topic: Chemistry, Solutions, NEET
Why do Group 16 elements have lower ionization enthalpy values compared to Group 15 in the corresponding periods?

Options:
A They have more electrons in the outermost shell
B They have extra stable half-filled s orbitals
C They have extra stable half-filled p orbitals electronic configurations
D They have fewer protons in the nucleus

The correct answer is:
They have extra stable half-filled p orbitals electronic configurations

Solution:
The paragraph explains that Group 16 elements have lower ionization enthalpy values compared to Group 15 due to the extra stable half-filled p orbitals electronic configurations in Group 15.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Why do group 17 elements (the halogens) have very high negative electron gain enthalpies?

Options:
A They have small atomic sizes.
B They have stable noble gas electronic configurations.
C They have low electron-electron repulsion.
D They have low effective nuclear charge.

The correct answer is:
They have stable noble gas electronic configurations.

Solution:
Halogens have very high negative electron gain enthalpies because they can attain stable noble gas electronic configurations by picking up an electron.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Why do haloalkanes tend to dissolve in organic solvents?

Options:
A Organic solvents have strong hydrogen bonding.
B Organic solvents have weak attractions with haloalkanes.
C Organic solvents have strong intermolecular attractions with haloalkanes.
D Organic solvents have strong hydrogen bonding with water.

The correct answer is:
Organic solvents have strong intermolecular attractions with haloalkanes.

Solution:
Haloalkanes tend to dissolve in organic solvents because the new intermolecular attractions between haloalkanes and solvent molecules have much the same strength as the ones being broken in the separate haloalkane and solvent molecules.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Why do halogens exhibit different colors?

Options:
A Due to their melting points
B Due to the excitation of outer electrons
C Due to their atomic masses
D Due to the number of valence electrons

The correct answer is:
Due to the excitation of outer electrons

Solution:
Halogens exhibit different colors due to the excitation of their outer electrons to higher energy levels, which results in the absorption of radiations in the visible region.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Why do halogens have little tendency to lose electrons?

Options:
A High ionisation enthalpy
B Low electron gain enthalpy
C Low electron affinity
D Large atomic size

The correct answer is:
High ionisation enthalpy

Solution:
Halogens have little tendency to lose electrons because they have high ionisation enthalpy, making it energetically unfavorable to lose electrons.**

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Why do heavier elements not form pπ– pπ bonds like carbon?

Options:
A Because they have smaller atomic orbitals.
B Because they have too few valence electrons.
C Because their atomic orbitals are too large and diffuse to have effective overlapping.
D Because they have a higher ionization enthalpy.

The correct answer is:
Because their atomic orbitals are too large and diffuse to have effective overlapping.

Solution:
Heavier elements do not form pπ– pπ bonds because their atomic orbitals are too large and diffuse to have effective overlapping.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Why do higher carboxylic acids have a lower odour compared to lower ones?

Options:
A They are less polar.
B They have weaker dipole-dipole interactions.
C They have lower molecular masses.
D They have lower vapour pressure.

The correct answer is:
They have lower vapour pressure.

Solution:
Higher carboxylic acids have lower vapour pressure, which leads to a reduced odour compared to lower ones.

Topic: Chemistry, Aldehydes, Ketones and Carboxylic Acids, NEET
Why do highly reactive non-metals readily form ionic compounds with highly reactive metals?

Options:
A Due to similar electronegativities
B Due to small size differences
C Due to large differences in electronegativities
D Due to metallic properties

The correct answer is:
Due to large differences in electronegativities

Solution:
Highly reactive non-metals readily form ionic compounds with highly reactive metals because of large differences in their electronegativities.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Why do infected persons often not go for timely detection and treatment of STIs?

Options:
A Due to severe symptoms in the early stages of infection
B Due to the social stigma attached to STIs
C Due to the cost of treatment
D Due to lack of knowledge about the infection

The correct answer is:
Due to the social stigma attached to STIs

Solution:
The absence or less significant symptoms in the early stages of infection and the social stigma attached to STIs deter infected persons from going for timely detection and proper treatment.

Topic: Biology, Reproductive Health, NEET
Why do insoluble soaps formed in hard water not work as cleansing agents?

Options:
A Because they are too dense
B Because they lack fragrance
C Because they are not soluble in water
D Because they are too cold

The correct answer is:
Because they are not soluble in water

Solution:
Insoluble soaps formed in hard water do not work as cleansing agents because they are not soluble in water.

Topic: Chemistry, Chemistry in Everyday Life, NEET
Why do ions of the same charge in a given series show a progressive decrease in radius with increasing atomic number?

Options:
A Because the shielding effect of a d electron is not effective.
B Because the net electrostatic attraction between the nuclear charge and the outermost electron decreases.
C Because the new electron enters a d orbital each time the nuclear charge increases by unity.
D Because the variation within a series is quite small.

The correct answer is:
Because the new electron enters a d orbital each time the nuclear charge increases by unity.

Solution:
Ions of the same charge in a given series show a progressive decrease in radius with increasing atomic number because the new electron enters a d orbital each time the nuclear charge increases by unity.

Topic: Chemistry, d and f Block Elements, NEET
Why do liquids have a definite volume?

Options:
A Because their molecules are separated from each other
B Because their molecules have strong chemical bonds
C Because their molecules are immobile
D Because their molecules do not separate from each other

The correct answer is:
Because their molecules do not separate from each other

Solution:
Liquids have a definite volume because their molecules do not separate from each other.

Topic: Chemistry, States of Matter, NEET
Why do liquids tend to have the minimum number of molecules at their surface?

Options:
A To reduce density
B To increase viscosity
C To minimize surface area
D To decrease vapor pressure

The correct answer is:
To minimize surface area

Solution:
Liquids tend to have the minimum number of molecules at their surface to minimize surface area.

Topic: Chemistry, States of Matter, NEET
Why do liquids wet things and spread across their surfaces as a thin film?

Options:
A High density
B Viscosity
C Surface tension
D Gravity

The correct answer is:
Surface tension

Solution:
Liquids wet things and spread as a thin film across their surfaces because of surface tension.

Topic: Chemistry, States of Matter, NEET
Why do lone pair electrons in a molecule occupy more space than bonding pairs?

Options:
A Because lone pairs have a stronger attraction to the central atom.
B Because bonding pairs are shared between two atoms.
C Because bonding pairs have greater repulsion.
D Because lone pairs are localized on the central atom.

The correct answer is:
Because bonding pairs are shared between two atoms.

Solution:
Lone pair electrons occupy more space because each bonding pair is shared between two atoms, leading to greater repulsion between lone pairs.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Why do many fluorides tend to be less soluble than the corresponding chlorides?

Options:
A Fluorides have a lower lattice enthalpy than chlorides.
B Chlorides have a lower lattice enthalpy than fluorides.
C Fluorides have a higher lattice enthalpy than chlorides.
D Chlorides have a higher lattice enthalpy than fluorides.

The correct answer is:
Fluorides have a higher lattice enthalpy than chlorides.

Solution:
Many fluorides tend to be less soluble than the corresponding chlorides because fluorides generally have a higher lattice enthalpy, making it more difficult for them to dissolve.

Topic: Chemistry, Thermodynamics (C), NEET
Why do many people prefer to use artificial sweeteners over natural sweeteners?

Options:
A Artificial sweeteners are cheaper
B Natural sweeteners are unhealthy
C Artificial sweeteners do not add to calorie intake
D Artificial sweeteners have a better taste

The correct answer is:
Artificial sweeteners do not add to calorie intake

Solution:
Natural sweeteners like sucrose add to calorie intake, so many people prefer artificial sweeteners.

Topic: Chemistry, Chemistry in Everyday Life, NEET
Why do molecules in the bulk of a liquid not experience a net force?

Options:
A Equal intermolecular forces from all sides
B Surface tension
C High density
D Lack of adhesion

The correct answer is:
Equal intermolecular forces from all sides

Solution:
Molecules in the bulk of a liquid do not experience a net force because they have equal intermolecular forces acting on them from all sides.

Topic: Chemistry, States of Matter, NEET
Why do noble gases exhibit very low chemical reactivity?

Options:
A They have a high electron gain enthalpy.
B They readily add electrons to their valence shell.
C Their valence shell orbitals are completely filled.
D They readily lose electrons.

The correct answer is:
Their valence shell orbitals are completely filled.

Solution:
Noble gases exhibit very low chemical reactivity because all the orbitals in the valence shell are completely filled by electrons.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Why do noble gases have comparatively large atomic sizes?

Options:
A They have high nuclear charge.
B They have high electron affinity.
C They have complete valence electron shells.
D They have low ionization energy.

The correct answer is:
They have complete valence electron shells.

Solution:
Correct Option is : (C)
They have complete valence electron shells.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Why do noble gases have large positive electron gain enthalpies?

Options:
A They have small atomic sizes.
B They have low electron-electron repulsion.
C They have stable noble gas electronic configurations.
D They have to enter the next higher principal quantum level.

The correct answer is:
They have to enter the next higher principal quantum level.

Solution:
Noble gases have large positive electron gain enthalpies because the added electron has to enter the next higher principal quantum level, leading to a very unstable electronic configuration.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Why do noble gases have low melting and boiling points?

Options:
A They have strong covalent bonds
B They readily form compounds with other elements
C Their interatomic interactions are weak dispersion forces
D They have high ionization energies

The correct answer is:
Their interatomic interactions are weak dispersion forces

Solution:
Noble gases have low melting and boiling points because their only type of interatomic interaction is weak dispersion forces.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Why do pairs of electrons in the valence shell repel one another, according to the VSEPR theory?

Options:
A Because they have opposite charges
B Because they have the same charges
C Because they are attracted to each other
D Because they have different energies

The correct answer is:
Because they have the same charges

Solution:
According to the VSEPR theory, pairs of electrons in the valence shell repel one another because their electron clouds are negatively charged, and like charges repel.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET