datavorous/entrance-exam-dataset huggingface dataset:
Based on equation $E=-2.178 \times 10^{-18} \mathrm{~J}\left(\frac{Z^2}{n^2}\right)$ certain conclusions are written. Which of them is not correct?

Options:
A The negative sign in equation simply means that the energy of electron bound to the nucleus is lower than it would be if the electrons were at the infinite distance from the nucleus
B Larger the value of $n$, the larger is the orbit radius
C Equation can be used to calculate the change in energy when the electron changes orbit
D For $n=1$ the electron has a more negative energy than it does for $n=6$ which means that the electron is more loosely bound in the smallest allowed orbit

The correct answer is:
For $n=1$ the electron has a more negative energy than it does for $n=6$ which means that the electron is more loosely bound in the smallest allowed orbit

Solution:
If $n=1$,
$$
E_1=-2.178 \times 10^{-18} Z^2 \mathrm{~J}
$$
If $n=6$
$$
\begin{aligned}
E_6 & =\frac{-2.178 \times 10^{-18} Z^2}{36} \mathrm{~J} \\
& =6.05 \times 10^{-20} Z^2 \mathrm{~J}
\end{aligned}
$$
From the above calculation, it is abvious that electron has a more negative energy than it does for $n=6$. It means that electron is more strongly bound in the smallest allowed orbit.

Topic: Chemistry, Structure of Atom, NEET, NEET 2013 (All India)
Based on equation E=-2.178×10-18Jz2n2, certain conclusions are written. Which of them is not correct?

Options:
A Larger the value of n, the larger is the orbit radius.
B Equation can be used to calculate the change in energy when the electron changes orbit.
C For n = 1, the electron has a more negative energy than it does for n = 6 which means that the electron is more loosely bound in the smallest allowed orbit.
D The negative sign in equation simply means that the energy of electron bound to the nucleus is lower than it would be if the electrons were at the infinite distance from the nucleus.

The correct answer is:
For n = 1, the electron has a more negative energy than it does for n = 6 which means that the electron is more loosely bound in the smallest allowed orbit.

Solution:
Here option A is correct as rn∝n2
Option B and D are correct facts
Option C is incorrect as on moving closer to nucleus Zeff↑ so e- are more firmly attached with the nucleus.

Topic: Chemistry, Structure of Atom, NEET
Based on Langmuir adsorption isotherm, at very high pressures the amount of gas adsorbed

Options:
A Increases first and decreases later with pressure
B Reaches a constant limiting value
C Goes on decreasing with pressure
D Goes on increasing with pressure

The correct answer is:
Reaches a constant limiting value

Solution:
According to langmuir Adsorption isotherm the amount of gas adsorbed at very high pressures reaches a constant limiting volume.

Topic: Chemistry, Surface Chemistry, NEET
Based on solute-solvent interactions, arrange the following in order of increasing solubility in n-octane : Cyclohexane, KCl, CH3OH, CH3CN

Options:
A CH3CN < Cyclohexane < KCl < CH3OH
B KCl < Cyclohexane < CH3OH < CH3CN
C KCl < CH3CN < CH3OH < Cyclohexane
D KCl < CH3OH < CH3CN < Cyclohexane

The correct answer is:
KCl < CH3OH < CH3CN < Cyclohexane

Solution:
Correct Option is : (D)
KCl < CH3OH < CH3CN < Cyclohexane

Topic: Chemistry, Solutions, NEET
Based on the arrangement of orbitals by energy (n+l), arrange the following orbitals in increasing order of energy 1s, 2s, 3s, 2p

Options:
A 2s < 2p < 3s < 1s
B 1s < 2s < 2p < 3s
C 1s < 2p < 2s < 3s
D 3s < 2p < 2s < 1s

The correct answer is:
1s < 2s < 2p < 3s

Solution:
Correct Option is : (B)
1s < 2s < 2p < 3s

Topic: Chemistry, Structure of Atom, NEET
Based on the arrangement of orbitals by energy (n+l), arrange the following orbitals in increasing order of energy 4s, 3s, 3p, 4d -

Options:
A 3s < 4s < 3p < 4d -
B 4s < 3p < 3s < 4d -
C 3s < 3p < 4s < 4d -
D 3s < 3p < 4d < 4s

The correct answer is:
3s < 3p < 4s < 4d -

Solution:
Correct Option is : (C)
3s < 3p < 4s < 4d -

Topic: Chemistry, Structure of Atom, NEET
Based on the arrangement of orbitals by energy (n+l), arrange the following orbitals in increasing order of energy 5f, 6d, 7s, 7p -

Options:
A 7s < 5f < 6d < 7p -
B 5f < 6d < 7s < 7p -
C 7p < 6d < 7s < 5f -
D 6d < 7p < 5f < 7s

The correct answer is:
7s < 5f < 6d < 7p -

Solution:
Correct Option is : (A)
7s < 5f < 6d < 7p -

Topic: Chemistry, Structure of Atom, NEET
Based on the arrangement of orbitals by energy (n+l), arrange the following orbitals in increasing order of energy 5p, 4d, 5d, 4f, 6s -

Options:
A 4d < 5p < 6s < 4f < 5d -
B 6s < 5p < 4d < 5d < 4f -
C 4f < 4d < 5d < 5p < 6s -
D 4d < 5p < 5d < 4f < 6s

The correct answer is:
4d < 5p < 6s < 4f < 5d -

Solution:
Correct Option is : (A)
4d < 5p < 6s < 4f < 5d -

Topic: Chemistry, Structure of Atom, NEET
Based on the diagram given below, choose the correct statement from the following.

Options:
A It is a pyramid of energy depicting the ocean ecosystem.
B It is a pyramid of biomass which shows a small standing crop of phytoplankton supporting a larger standing crop of zooplankton.
C It is a pyramid of biomass of a grassland ecosystem with standing crop of primary consumers supporting that of primary producers.
D It shows the pyramid of number of the plankton population in an ocean ecosystem.

The correct answer is:
It is a pyramid of biomass which shows a small standing crop of phytoplankton supporting a larger standing crop of zooplankton.

Solution:
Each trophic level has a certain mass of living material at a particular time called the standing crop. The standing crop is measured as the mass of living organisms (biomass) or the number in a unit area. An ocean ecosystem is largely dominated by the plankton population. The given diagram shows an inverted pyramid of biomass with a small standing crop of phytoplankton supporting a large standing crop of zooplankton.

Topic: Biology, Ecosystem, NEET
Based on the diagram given below, what is the ploidy of the structure labelled D?

Options:
A n
B 2n
C 3n
D 4n

The correct answer is:
3n

Solution:
A - degenerating synergids, B - zygote, C - primary endosperm cell, D - primary endosperm nucleus, E - degenerating antipodal cells
After entering one of the synergids, the pollen tube releases the two male gametes into the cytoplasm of the synergid. One of the male gametes moves towards the egg cell and fuses with its nucleus thus completing the syngamy. This results in the formation of a diploid cell, the zygote. The other male gamete moves towards the two polar nuclei located in the central cell and fuses with them to produce a triploid primary endosperm nucleus (PEN). As this involves the fusion of three haploid nuclei it is termed triple fusion. Since two types of fusions, syngamy and triple fusion take place in an embryo sac the phenomenon is termed double fertilisation, an event unique to flowering plants. The central cell after triple fusion becomes the primary endosperm cell (PEC) and develops into the endosperm while the zygote develops into an embryo.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
Based on the different reasons for conserving biodiversity, choose the incorrect one from the following.

Options:
A The ethical argument for conserving biodiversity relates to what we owe to nature and our contribution to protecting it.
B The most obvious arguments for conserving the biodiversity are made through the narrowly utilitarian approach.
C The benefits of pollination are argued as a reason through the narrowly utilitarian approach.
D One of the major benefits reaped from plants are medicines, from which more than 25 per cent of the drugs currently sold in the market worldwide are derived.

The correct answer is:
The benefits of pollination are argued as a reason through the narrowly utilitarian approach.

Solution:
The broadly utilitarian argument says that biodiversity plays a major role in many ecosystem services that nature provides. Pollination (without which plants cannot give us fruits or seeds) is another service, ecosystems provide through pollinators layer â bees, bumblebees, birds and bats.

Topic: Biology, Biodiversity and its Conservation, NEET
Based on the fact that many elements are found in living organisms either free or in the form of compounds, which of the following is an exception?

Options:
A Silicon
B Magnesium
C Iron
D Sodium

The correct answer is:
Silicon

Solution:
Humans and earth's crust shows presence of many elements in different percentages. Oxygen is a major element in both. However the second largest element in the human body is carbon while in earth's crust is silicon. Silicon is negligible in the human body.

Topic: Chemistry, Biomolecules, NEET
Based on the following reactions
C(graphite) +O2(g)→CO2(g);ΔH=-394 KJ/mol …(i)
2CO(g)+O2(g)→2CO2(g);ΔH=-569 KJ/mol …(ii)
The heat of formation of CO will be

Options:
A +109.5 kJ
B +219 kJ
C -109.5 KJ
D -219 KJ

The correct answer is:
+219 kJ

Solution:
EC+EO2→ECO2+394
ECO2=-394
2ECO+EO2→2ECO2+569
2ECO=2ECO2+569=2ECO2+569
=2×-394+569=-219
∴  E CO  = −109.5 kJ

Topic: Chemistry, Thermodynamics (C), NEET
Based on the given data, what is the mass of the Earth (ME) with g = 9.81 m/s², RE = 6.37 × 10^6 m, R = 3.84 × 10^8 m, and the time period of the moon's revolution being 27.3 days?

Options:
A 5.972 × 10^24 kg
B 5.154 × 10^24 kg
C 6.114 × 10^24 kg
D 4.976 × 10^24 kg

The correct answer is:
5.972 × 10^24 kg

Solution:
Correct Option is : (A)
5.972 × 10^24 kg

Topic: Chemistry, Gravitation, NEET
Based on the given process, identify the correct match for A, B, C and D from the following options.

Options:
A

A	B	C	D

PGAL	PEP	C2H5OH	Lactic acid

B

A	B	C	D

PGAL	PEP	Lactic acid	C2H5OH

C

A	B	C	D

G-6-P	2-PGA	C2H5OH	Lactic acid

D

A	B	C	D

PEP	F-6-P	Lactic acid	C2H5OH

The correct answer is:

A	B	C	D

PGAL	PEP	Lactic acid	C2H5OH

Solution:
The chemical equation below summarizes the fermentation of glucose, whose chemical formula is C6H12O6. One glucose molecule is converted into two ethanol molecules and two carbon dioxide molecules: C6H12O6 → 2 C2H5OH + 2 CO2 C2H5OH is the chemical formula for ethanol. Before fermentation takes place, one glucose molecule is broken down into two pyruvate molecules. This is known as glycolysis. Later, lactic acid fermentation takes place.

Topic: Biology, Respiration in Plants, NEET
Based on the Hardy-Schulze rule, explain why the coagulating power of phosphate is higher than chloride.

Options:
A Phosphate ions have a higher charge and greater charge density.
B Chloride ions have a higher charge and greater charge density.
C Phosphate ions have a lower charge and greater charge density.
D Chloride ions have a lower charge and greater charge density.

The correct answer is:
Phosphate ions have a higher charge and greater charge density.

Solution:
Correct Option is : (A)
Phosphate ions have a higher charge and greater charge density.

Topic: Chemistry, Surface Chemistry, NEET
Based on the Hatch and Slack pathway, which of the following compounds are found in mesophylls and bundle sheath cells, respectively?

Options:
A PEPcase, RuBisCO
B PEP, ATPase
C RuBisCo, PEPcase
D PEP, RuBisCO

The correct answer is:
PEP, RuBisCO

Solution:
The primary CO2 acceptor is a 3-carbon molecule phosphoenolpyruvate (PEP) and is present in the mesophyll cells. The enzyme responsible for this fixation is PEP carboxylase or PEPcase. It is important to register that the mesophyll cells lack RuBisCO enzyme. The C4 acid OAA is formed in the mesophyll cells.

Topic: Biology, Photosynthesis in Higher Plants, NEET
Based on the phenomenon represented by the given diagram, choose the correct statement from the following.

Options:
A The finches on the Galapagos islands prove an evolution due to mutation.
B A rapid decline was observed in the population of finches on the islands due to competition among the species.
C This phenomenon is an example of convergent evolution, which is similarly observed between the Australian marsupials and placental mammals.
D The original insectivorous finches evolved into seed-eating and vegetarian finches, eventually changing the shape of their beaks according to their food habits.

The correct answer is:
This phenomenon is an example of convergent evolution, which is similarly observed between the Australian marsupials and placental mammals.

Solution:
The finches of Galapagos Islands provided evidence in favor of adaptive radiation. They are known as Darwin's finches, as they were observed by Darwin while he visited the island. He discovered that different varieties of the finches which evolved in the same island. The variety ranged from the original seed-eating features to other forms with altered beaks. These modifications enabled them to become insectivorous and vegetarian finches. This process of evolution of species in a given geographical area which starts at a particular point and radiates to other areas of geography is called adaptive radiation.
Another example is Australian marsupials. A number of marsupials, each different from the other evolved from an ancestral stock, but all within the Australian island continent. When more than one adaptive radiation appeared to have occurred in an isolated geographical area (representing different habitats), one can call this convergent evolution. Placental mammals in Australia also exhibit adaptive radiation in evolving into varieties of such placental mammals each of which appears to be âsimilarâ to a corresponding marsupial (e.g., Placental wolf and Tasmanian wolf-marsupial).

Topic: Biology, Evolution, NEET
Based on the simplified cycle given below, choose the option with the accurate labellings for A, B, C and D.

Options:
A A - Detritus; D - Litter fall
B B - Detritus; D - Weathering
C A - Rock minerals; C - Producers
D C - Producers; D - Decomposition

The correct answer is:
A - Detritus; D - Litter fall

Solution:
The natural reservoir of phosphorus is rock, which contains phosphorus in the form of phosphates. When rocks are weathered, minute amounts of these phosphates dissolve in soil solution and are absorbed by the roots of the plants. Herbivores and other animals obtain this element from plants. The waste products and the dead organisms are decomposed by phosphate-solubilising bacteria releasing phosphorus.

Topic: Biology, Ecosystem, NEET
Based on the source of their nutrition or food, organism occupies a specific place in the food chain which is known as their:

Options:
A Trophic level
B Standing state
C Food web
D Stratification

The correct answer is:
Trophic level

Solution:
Organism occupy a place in the natural surroundings or in a community according to their feeding relationship with other organisms. Based on the source of their nutrition or food, organism occupy a specific place in the food chain that is known as their trophic level. Producer belongs to first trophic level, herbivores to second and carnivores to third trophic level.

Topic: Biology, Ecosystem, NEET
Based on the structures of BeCl2in different phases, which of the following statements is true?

Options:
A BeCl2in the vapor phase has a linear molecular geometry.
B BeCl2in the solid phase forms discrete linear molecules.
C BeCl2in the solid phase consists of a three-dimensional network of BeCl2molecules.
D BeCl2in the vapor phase forms a three-dimensional network of BeCl4tetrahedra.

The correct answer is:
BeCl2in the vapor phase has a linear molecular geometry.

Solution:
Correct Option is : (A)
BeCl2in the vapor phase has a linear molecular geometry.

Topic: Chemistry, s Block Elements, NEET
Basic principle of hydrogen economy is transportation and storage of energy in the form of liquid or gaseous hydrogen. Which property of hydrogen may be useful for this purpose? Support your answer with the chemical equation if required.

Options:
A High flammability of hydrogen
B High energy density of hydrogen
C High solubility of hydrogen in water
D High reactivity of hydrogen with metals

The correct answer is:
High energy density of hydrogen

Solution:
Correct Option is : (B)
High energy density of hydrogen

Topic: Chemistry, Hydrogen, NEET
Bauxite is an ore of:

Options:
A Gold
B Copper
C Aluminium
D Zinc

The correct answer is:
Aluminium

Solution:
Correct Option is : 3
Aluminium

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
BCl3exists as monomer whereas AlCl3is dimerized through halogen bridging. Give reason. Explain the structure of the dimer of AlCl3also.

Options:
A BCl3has a smaller size than AlCl3, leading to monomer formation. The dimer of AlCl3has a bridged structure.
B BCl3has a larger size than AlCl3, leading to monomer formation. The dimer of AlCl3has a bridged structure.
C BCl3has a smaller size than AlCl3, leading to monomer formation. The dimer of AlCl3has a linear structure.
D BCl3has a larger size than AlCl3, leading to monomer formation. The dimer of AlCl3has a linear structure.

The correct answer is:
BCl3has a smaller size than AlCl3, leading to monomer formation. The dimer of AlCl3has a bridged structure.

Solution:
Correct Option is : (A)
BCl3has a smaller size than AlCl3, leading to monomer formation. The dimer of AlCl3has a bridged structure.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Be2C + 4 H2O â¶ 2 X + CH4

X + 2 HCl â¶ Y

'X' and 'Y' formed in the above two reactions are -

Options:
A BeCO3 and Be(OH)2 ; respectively
B Be(OH)2 and BeCl2 ; respectively
C Be(OH)2 and [Be(OH)4]Cl2 ; respectively
D [Be(OH)4]2- and BeCl2 ; respectively

The correct answer is:
Be(OH)2 and BeCl2 ; respectively

Solution:
Be2C + 4H2O â 2 Be(OH)2 + CH4
Thus, 'X' is Be(OH)2.
Next, X reacts with HCl to form:
Be(OH)2 + 2HCl â BeCl2 + 2H2O
Thus, 'Y' is BeCl2.

Topic: Chemistry, s Block Elements, NEET
Be and Al have similar properties (diagonal relationship), because they

Options:
A have identical atomic and ionic radii
B have similar outer electronic configurations
C have similar polarizing power
D belong to the same group

The correct answer is:
have similar polarizing power

Solution:
Be and Al have similar properties (diagonal relationship), because they have similar polarizing power.
Be2+ (size = 27 pm) and Al3+ (size = 53.5) have similar polarizing powers [charge/ 4π (ionic radius )2 ].

Topic: Chemistry, s Block Elements, NEET
Bean seeds were planted and put on a sunny windowsill. As the plants grew, their stems bent toward the window. This bending was most likely caused by an

Options:
A Unequal distribution of auxin in the stem.
B Unequal distribution of a neurotransmitter in the stem.
C Equal distribution of auxin in the stem.
D Equal distribution of a neurotransmitter in the stem.

The correct answer is:
Unequal distribution of auxin in the stem.

Solution:
The plant hormone, auxin, is more distributed on the side away from the unilateral illumination causing cells to grow faster in the darker side, which in turn, causes the plant to bend toward the light. If the distribution were equal, the plant would grow just upwards. Neuro-transmitters are chemicals secreted by multicellular animals and are used in transmitting impulses in the nervous system.

Topic: Biology, Plant - Growth and Development, NEET
Beats are produced when two progressive waves of frequency 256 Hz and 260 Hz superpose. Then the resultant amplitude changes periodically with frequency of

Options:
A 256 Hz
B 260 Hz
C 256-2602 Hz
D 4 Hz

The correct answer is:
4 Hz

Solution:
Frequency of change of resultant amplitude=number of beatss-1=260-256=4 Hz.

Topic: Physics, Waves and Sound, NEET
Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers).

Options:
A Zr (40) and Nb (41)
B Zr (40) and Hf (72)
C Zr (40) and Ta (73)
D Ti (22) and Zr (40)

The correct answer is:
Zr (40) and Hf (72)

Solution:
Due to lanthanoid contraction (poor screening effect caused by inner d and f orbitals electrons due to their deeper inside location) atomic radii of Zr and Hf is almost similar.
Zr = 159 pm, Hf = 156 pm

Topic: Chemistry, d and f Block Elements, NEET
Because of lanthanoid contraction, which of the following pairs of elements have nearly the same atomic radii? (Number in the parenthesis are atomic numbers).

Options:
A Ti 22 and Zr 40
B Zr 40 and Nb 41
C Zr 40 and Hf 72
D Zr 40 and Ta 73

The correct answer is:
Zr 40 and Hf 72

Solution:
Zr 40 and Hf 72: Because of the lanthanoid contraction, Zr (atomic radii 160 pm) and Hf (atomic radii 158 pm) have nearly the same atomic radii.
Lanthanoids include the elements from lanthanum La Z=57 to lutetium Lu Z=71. Zirconium Zr 40 belong to the second transition series 4d and Hf 72 belongs to the third transition series 5d. Lanthanoid contraction is related to the intervention of the 4f-orbitals, which are filled before the 5d-series of elements start. The filling of 4f, if orbitals before 5d-orbitals result in a regular decrease in atomic radii, which compensates the expected increases in atomic size with increasing atomic number. As a result of lanthanoid contraction, the elements of second and third transition series have almost similar atomic radii.

Topic: Chemistry, d and f Block Elements, NEET, NEET 2015 (Phase 1)
BeCl2has chain structure in which state?

Options:
A Solid
B Liquid
C Gas
D None of the above

The correct answer is:
Solid

Solution:
Correct Option is : 1
Solid

Topic: Chemistry, s Block Elements, NEET
Bees are known to play an important role in pollination. Which of the following is implemented to increase pollination efficiency in crop fields?

Options:
A Keeping beehives in crop fields during flowering season
B Keeping beehives in crop fields during harvesting season
C Keeping beehives far away from the crop fields
D Other pollinating agents should be employed in crop fields

The correct answer is:
Keeping beehives in crop fields during flowering season

Solution:
Bees are the pollinators of many of our crop species such as sunflower, Brassica, apple and pear. Keeping beehives in crop fields during the flowering period increases pollination efficiency and improves the yield beneficial both from the point of view of crop yield and honey yield.

Topic: Biology, Strategies for Enhancement in Food Production, NEET
Before the five-kingdom system, organisms such as Chlamydomonas and Spirogyra were classified under:

Options:
A Monera
B Algae
C Fungi
D Plantae

The correct answer is:
Algae

Solution:
Earlier classification systems included bacteria, blue-green algae, fungi, mosses, ferns, gymnosperms and the angiosperms under ‘Plant’ kingdom. The character that unified this whole kingdom was that all these organisms had a cell wall in their cells. This placed groups together which widely differed in other characteristics. It brought together the prokaryotic bacteria and the blue-green algae (cyanobacteria) with other groups which were eukaryotic. It also grouped together the unicellular organisms and the multicellular ones, for example, Chlamydomonas and Spirogyra were placed together under algae.

Topic: Biology, Biological Classification, NEET
Before the neutrino hypothesis, the beta decay process was throught to be the transition,
If this was true, show that if the neutron was at rest, the proton would emerge with fixed energies and calculate them.

Options:
A 937 MeV
B 936 MeV
C 935 MeV
D 934 MeV

The correct answer is:
936 MeV

Solution:
Correct Option is : (B)
936 MeV

Topic: Chemistry, Nuclear Physics, NEET
Beijernick concluded that the cause of tobacco mosaic disease was not a filtrate toxin because

Options:
A the infectious agent could not be cultivated on nutrient media
B the infectious agent could be crystallized
C the infectious agent reproduced and could be passed on from a plant infected with filtered sap
D the sap was infectious even though it was filtered to remove bacterias.

The correct answer is:
the sap was infectious even though it was filtered to remove bacterias.

Solution:
M.W. Beijerinek demonstrated that the extract of the infected plants of tobacco could cause infection in healthy plants and called the fluid as contagium vivum fluidum (infectious living fluid). The virus was found to be smaller than bacteria because they passed through a bacteria proof filter.

Topic: Biology, Biological Classification, NEET