datavorous/entrance-exam-dataset huggingface dataset:
When H 2 O 2 is oxidised, the product is

Options:
A O H â
B O 2
C O 2â
D H O 2 −

The correct answer is:
O 2

Solution:
Oxidation involves loss of electrons.
Oxygen in H 2 O 2 is losing 2 e â to form O 2 . Therefore oxidised product is O 2

Topic: Chemistry, s Block Elements, NEET
When HCl reacts with finely powdered iron, it forms ferrous chloride and not ferric chloride. Why?

Options:
A The iron reacts with HCl to form a complex compound.
B Finely powdered iron has a higher reactivity with HCl.
C Ferric chloride is not stable under the reaction conditions.
D Ferric chloride is not formed due to lack of oxygen.

The correct answer is:
Finely powdered iron has a higher reactivity with HCl.

Solution:
Correct Option is : (B)
Finely powdered iron has a higher reactivity with HCl.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
When HCl(aq) is titrated with NaOH(aq) conductometrically then the graphical representation of the titration will be

Options:
A
B
C
D

The correct answer is:

Solution:
When HCl is titrated against NaOH the conductance first decreases and then increases.

Topic: Chemistry, Electrochemistry, NEET
When heated, ammonium carbamate decomposes as follows
NH4COONH2(s)⇌2NH3(g)+CO2(g)
At a certain temperature, the equilibrium pressure of the system is 0.318 atm, Kp for the reaction is

Options:
A 0.128
B 0.146
C 4.76×10-3
D 2.24×10-2

The correct answer is:
4.76×10-3

Solution:
NH4COONH2(s)Eq.pressure⇌2NH3(g)2P+CO2(g)P
3P=0.318
P=0.106
PNH3=2×0.106=0.212
PCO2=0.106
kp=PNH32.PCO2
=0.212×0.212×0.106=0.00476
=4.76×10-3

Topic: Chemistry, Chemical Equilibrium, NEET
When hemiacetals react with one more molecule of alcohol, what type of compound is formed?

Options:
A Alkoxyalcohol
B Hemiacetal
C Acetal
D Ketal

The correct answer is:
Acetal

Solution:
When hemiacetals react with one more molecule of alcohol, they form acetals.

Topic: Chemistry, Aldehydes, Ketones and Carboxylic Acids, NEET
When heterozygous tall plants are self -pollinated, then tall and dwarf plants are obtained. This explains

Options:
A Law of dominance
B Law of segregation
C division in spores
D independent assortment

The correct answer is:
Law of segregation

Solution:
As per Mendel's Law of segregation, "alleles segregate randomly into gametes: When gametes are formed, each allele of one parent segregates randomly into the gametes, such that half of the parent's gametes carry each allele."
Gametes are the reproductive cells produced by meiosis. These cells participate in the fertilization process to form the zygote. Gametes contain half the genetic content of the parent cell. Also, the genes/allele/loci segregate and recombine during the meiosis. The alleles in the gamete for the feature (stem height) segregate from each other and each gamete formed receives only one allele for each gene/feature.
Expression of tall and dwarf plants in next-generation on self-pollinating heterozygous tall plants supports the law of segregation.

Topic: Biology, Principles of Inheritance and Variation, NEET
When hydrochloric acid (HCl) reacts with ammonia (NH3), what is the product formed?

Options:
A Hydrogen gas (H2)
B Ammonium chloride (NH4Cl)
C Water (H2O)
D Sodium chloride (NaCl)

The correct answer is:
Ammonium chloride (NH4Cl)

Solution:
When hydrochloric acid (HCl) reacts with ammonia (NH3), the product formed is ammonium chloride (NH4Cl).

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
When I2 dissociates to its atomic form the following reaction occurs
I2g⇌2Ig;ΔfH°=+150kJ
The reaction is favoured at

Options:
A low temperature
B high temperature
C no change with temperature
D high pressure

The correct answer is:
high temperature

Solution:
According to Le-chetelier's principle in case of endothermic process as heat is required so high temperature or increase in temperature favours forward reaction.

Topic: Chemistry, Chemical Equilibrium, NEET
When induced emf in inductor coil is 50% of its maximum value then stored energy in inductor coil in the given circuit will be

Options:
A 2.5 mJ
B 5Â mJ
C 15Â mJ
D 20Â mJ

The correct answer is:
2.5 mJ

Solution:
If the maximum value of induced EMF is V then 50% of induced EMF is V2. Also, at this moment voltage across resistor will be V2.
E=12Li2
E=12LV2R2
E=125×10-32212
E=2.5 mJ

Topic: Physics, Electromagnetic Induction, NEET
When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is:

Options:
A Zero
B First
C Second
D More than zero but less than first

The correct answer is:
First

Solution:
t1/2∝1a0n-1
t1/2 is independent of initial concentration i.e.
t1/2∝1a01-1 (is constant)
i.e n = 1 (order of reaction)

Topic: Chemistry, Chemical Kinetics, NEET, NEET 2015 (Phase 1)
When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is

Options:
A First
B Second
C More than zero but less than first
D Zero

The correct answer is:
First

Solution:
It is first order reaction in which half-life is independent of initial concentration.
t1/2∝1an-1
n = order of reaction
t1/2=0.693k (for first order t1/2 is independent of concentration)

Topic: Chemistry, Chemical Kinetics, NEET
When interference of light takes place

Options:
A energy is created in the region of maximum intensity
B energy is destroyed in the region of maximum intensity
C conservation of energy holds good and energy is redistributed
D conservation of energy does not hold good

The correct answer is:
conservation of energy holds good and energy is redistributed

Solution:
Interference is on the principle of conservation of energy. In interference, energy is redistributed.

Topic: Physics, Wave Optics, NEET
When iodine is passed through aquous solution of NaF, NaBr and NaCl

Options:
A It gives mixture of F2, Cl2 and Br2
B It gives chlorine
C It gives bromine
D None of these

The correct answer is:
None of these

Solution:
I 2 +NaF→ I 2 +NaBr→ I 2 +NaCl→ No reaction
Because I2 is least electronegative among halogens.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
When iodobenzene is treated with sodium in dry ether the product is

Options:
A DDT
B Triphenyl
C Diphenyl
D Dichlorobenzene

The correct answer is:
Diphenyl

Solution:
When iodobenzene is treated with sodium in dry ether the product formed is Diphenyl.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
When is a DNA mutation referred to as a DNA polymorphism?

Options:
A When the mutation is not inheritable
B When the mutation occurs in coding DNA sequence
C When more than one variant at a locus occurs in a population with a frequency greater than 0.01
D When the mutation occurs in non-coding DNA sequence

The correct answer is:
When more than one variant at a locus occurs in a population with a frequency greater than 0.01

Solution:
Allelic sequence variation is traditionally described as a DNA polymorphism if more than one variant at a locus occurs in the human population with a frequency greater than 0.01.

Topic: Biology, Molecular Basis of Inheritance, NEET
When is a person considered not healthy?

Options:
A When they have a disease
B When they are physically fit
C When they have a balanced diet and regular exercise
D When they have good mental health

The correct answer is:
When they have a disease

Solution:
A person is considered not healthy when the functioning of one or more organs or systems of the body is adversely affected by various signs and symptoms, also known as having a disease, not just physical fitness, balanced diet and regular exercise, or good mental health.

Topic: Biology, Human Health and Diseases, NEET
When is a process non-spontaneous based on the value of ∆G?

Options:
A When ∆G is negative
B When ∆G is positive
C When ∆G is zero
D When ∆G is undefined

The correct answer is:
When ∆G is positive

Solution:
A process is non-spontaneous when ∆G is positive.

Topic: Chemistry, Thermodynamics (C), NEET
When is a stage reached where the net force of attraction balances the force of repulsion?

Options:
A When potential energy is at its maximum.
B When potential energy is at its minimum.
C When the attractive force is less than the repulsive force.
D Cannot be determined.

The correct answer is:
When potential energy is at its minimum.

Solution:
Ultimately a stage is reached where the net force of attraction balances the force of repulsion and the system acquires minimum energy.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
When is dissociation of CO₂ from carbamino-haemoglobin likely to occur?

Options:
A When pCO₂ is high and pO₂ is low
B When pCO₂ is low and pO₂ is high
C When pCO₂ is high and pO₂ is high
D When pCO₂ is low and pO₂ is low

The correct answer is:
When pCO₂ is low and pO₂ is high

Solution:
When the pCO₂ is low and pO₂ is high as in the alveoli, dissociation of CO₂ from carbamino-haemoglobin takes place.

Topic: Biology, Breathing and Exchange of Gases, NEET
When is distillation under reduced pressure employed in purification?

Options:
A To purify low-boiling liquids
B To purify liquids with high boiling points
C To purify liquids that decompose at or below their boiling points
D To purify liquids that are immiscible with water

The correct answer is:
To purify liquids that decompose at or below their boiling points

Solution:
Distillation under reduced pressure is used to purify liquids that have very high boiling points or those that decompose at or below their boiling points.

Topic: Chemistry, General Organic Chemistry, NEET
When is heat absorbed by the system at constant pressure measured as changes in enthalpy?

Options:
A During adiabatic processes
B During isothermal processes
C During isobaric processes
D During isochoric processes

The correct answer is:
During isobaric processes

Solution:
Heat absorbed by the system at constant pressure is measured as changes in enthalpy during isobaric processes.

Topic: Chemistry, Thermodynamics (C), NEET
When is it not necessary to know the absolute population density?

Options:
A When the per cent cover or biomass is a more meaningful measure
B When the relative density serves the purpose equally well
C When the population is huge and counting is impossible or very Time Taken:consuming
D When the number of fish caught per trap is a good enough measure of its total population density

The correct answer is:
When the relative density serves the purpose equally well

Solution:
It is not necessary to know the absolute population density when the relative density serves the purpose equally well, for instance when the number of fish caught per trap is a good enough measure of its total population density in the lake.

Topic: Biology, Organisms and Populations, NEET
When is oxygen in an organic compound estimated directly?

Options:
A By heating it in a stream of nitrogen gas
B By passing the compound through iodine pentoxide
C By subtracting the percentage of carbon from 100
D By using a CHN elemental analyser

The correct answer is:
By passing the compound through iodine pentoxide

Solution:
Oxygen in an organic compound can be estimated directly by passing the mixture of gaseous products through warm iodine pentoxide.

Topic: Chemistry, General Organic Chemistry, NEET
When is peptization generally applied?

Options:
A To convert a stable sol into a precipitate
B To convert a freshly prepared precipitate into a colloidal sol
C To coagulate a colloidal sol
D To filter a colloidal sol

The correct answer is:
To convert a freshly prepared precipitate into a colloidal sol

Solution:
Peptization is generally applied to convert a freshly prepared precipitate into a colloidal sol.

Topic: Chemistry, Surface Chemistry, NEET
When is resonance particularly important in molecules?

Options:
A When there are no contributing structures
B When the contributing structures are equivalent in energy
C When there is only one contributing structure
D When the molecule is in a gaseous state

The correct answer is:
When the contributing structures are equivalent in energy

Solution:
Resonance is particularly important when the contributing structures are equivalent in energy.

Topic: Chemistry, General Organic Chemistry, NEET
When is the equation for a redox reaction considered balanced?

Options:
A When there are the same number of hydrogen atoms on both sides
B When there are the same number of oxygen atoms on both sides
C When the reactants and products have the same formula
D When the oxidation numbers are equal

The correct answer is:
When there are the same number of oxygen atoms on both sides

Solution:
The passage states that if there are the same number of oxygen atoms in the reactants and products, the equation represents the balanced redox reaction.

Topic: Chemistry, Redox Reactions, NEET
When is the expression for the equilibrium constant applicable?

Options:
A When concentrations are changing rapidly
B When concentrations have attained a constant value at equilibrium
C When initial concentrations are high
D When no reactants are present

The correct answer is:
When concentrations have attained a constant value at equilibrium

Solution:
Expression for equilibrium constant is applicable only when concentrations of the reactants and products have attained a constant value at equilibrium state.

Topic: Chemistry, Chemical Equilibrium, NEET
When is the factor label method typically used?

Options:
A For calculating percentages
B For solving algebraic equations
C For converting units between different systems
D For measuring temperature

The correct answer is:
For converting units between different systems

Solution:
The factor label method is typically used for converting units between different measurement systems.

Topic: Chemistry, Some Basic Concepts of Chemistry, NEET
When is the technique of continuous extraction employed in differential extraction?

Options:
A When the organic compound is highly soluble in the organic solvent
B When the organic compound is less soluble in the organic solvent
C When the organic compound is soluble in water
D When the organic compound is a solid

The correct answer is:
When the organic compound is less soluble in the organic solvent

Solution:
Continuous extraction is employed in differential extraction when the organic compound is less soluble in the organic solvent, requiring multiple extractions to recover it efficiently.

Topic: Chemistry, General Organic Chemistry, NEET
When is the term "cell electromotive force (emf)" used in relation to a galvanic cell?

Options:
A When current is drawn through the cell.
B When the cathode has a positive potential.
C When the anode has a negative potential.
D When no current is drawn through the cell.

The correct answer is:
When no current is drawn through the cell.

Solution:
It is called the cell electromotive force (emf) of the cell when no current is drawn through the cell. It is now an accepted convention that we keep the anode on the left and the cathode on the right while representing the galvanic cell.

Topic: Chemistry, Electrochemistry, NEET
When is the term "substrate" used in an organic reaction?

Options:
A When both reactants supply carbon to the new bond
B When only one reactant supplies carbon to the new bond
C When no carbon atoms are involved
D When no intermediates are formed

The correct answer is:
When both reactants supply carbon to the new bond

Solution:
When both reactants supply carbon to the new bond, the choice of which molecule is called the substrate becomes arbitrary.

Topic: Chemistry, General Organic Chemistry, NEET
When it can be divided into two similar halves only in one particular vertical plane, it is ___.

Options:
A Actinomorphic
B Zygomorphic
C Trimerous
D Tetramerous

The correct answer is:
Zygomorphic

Solution:
When it can be divided into two similar halves only in one particular vertical plane, it is Zygomorphic.

Topic: Biology, Morphology of Flowering Plants, NEET
When lactose is digested by the human body, each lactose molecule is broken down into smaller molecules. To which of the following categories of molecules do these smaller molecules belong?

Options:
A The group having a wetter ion
B The non-hydrolyzable group which is crystalline, sweet to taste and has asymmetric carbon atoms
C The group which are esters
D The group which has nitrogen in them

The correct answer is:
The non-hydrolyzable group which is crystalline, sweet to taste and has asymmetric carbon atoms

Solution:
Lactose is a disaccharide category of carbohydrates. On hydrolysis, it produces two monosaccharides glucose and galactose. The nonhydrolyzable group which is crystalline, sweet to taste, and has asymmetric carbon atoms is a monosaccharide. The group having a zwitter ion is an amino acid. They are used in making proteins. The group which is esters are lipids. Nitrogen is absent in monosaccharides.

Topic: Chemistry, Biomolecules, NEET
When ligands have numerical prefixes in their names, which terms are used to indicate them in the nomenclature?

Options:
A Bis, tris, tetrakis
B Mono, di, tri
C Alpha, beta, gamma
D Sigma, delta, epsilon

The correct answer is:
Bis, tris, tetrakis

Solution:
When ligands have numerical prefixes in their names, terms like bis, tris, and tetrakis are used to indicate them in the nomenclature.

Topic: Chemistry, Coordination Compounds, NEET
When light of wavelength 300nm or less falls on a photoelectric emitter A, photoelectrons are emitted. For another emitter B, light of wavelength 600nm is sufficient for releasing photoelectrons. The ratio of the work function of emitter A to B is

Options:
A 1:2
B 2:1
C 4:1
D 1:4

The correct answer is:
2:1

Solution:
Work function is given by
Ïâ=hcÎ»or Ïââ1Î»
âµ Ï 1 Ï 2 = Î» 2 Î» 1
= 6 0 0 3 0 0 = 2 1

Topic: Physics, Dual Nature of Matter, NEET
When light propagates through a material medium of relative permittivity ϵr and relative permeability μr, the velocity of light, v is given by : (c - velocity of light in vacuum)

Options:
A v=μrϵr
B v=ϵτμr
C v=cϵrμr
D v=c

The correct answer is:
v=cϵrμr

Solution:
We know, c=1μ0ε0

for any medium

v=1με but μ=μrμ0 and ε=εrε0

∴ v=1μrμ0εrε0

=1μrεr×1μ0ε0=cμrεr

Topic: Physics, Electromagnetic Waves, NEET, NEET 2022 (Phase 1)
When light travels from a rarer to a denser medium, does the reduction in speed imply a reduction in the energy carried by the light wave?

Options:
A Yes, a decrease in speed implies a reduction in energy.
B No, the speed of wave propagation does not affect the energy carried.
C Yes, the energy carried is directly proportional to the speed.
D No, the energy carried depends on the wavelength of the wave.

The correct answer is:
No, the speed of wave propagation does not affect the energy carried.

Solution:
Correct Option is : (B)
No, the speed of wave propagation does not affect the energy carried.

Topic: Chemistry, Wave Optics, NEET
When liquid ‘A’ is treated with a freshly prepared ammoniacal silver nitrate solution, it gives a bright silver mirror. The liquid forms a white crystalline solid on treatment with sodium hydrogensulphite. Liquid ‘B’ also forms a white crystalline solid with sodium hydrogensulphite but it does not test with ammoniacal silver nitrate. Which of the two liquids is aldehyde?

Options:
A Neither Liquid B or Liquid A is an aldehyde
B Cannot be discussed without further information
C Liquid ‘B’ is aldehyde
D Liquid ‘A’ is aldehyde

The correct answer is:
Liquid ‘A’ is aldehyde

Solution:
Correct Option is : (D)
Liquid ‘A’ is aldehyde

Topic: Chemistry, Aldehydes and Ketones, NEET
When looking at stars, are we seeing them in the present or the past?

Options:
A The present
B The future
C The past
D Not sure

The correct answer is:
The past

Solution:
When we see stars, we are apparently peeping into the past because the light emitted by the stars began its journey millions of years ago.

Topic: Biology, Evolution, NEET
When MnO2 is strongly heated to get oxygen gas, the oxidation number of Mn changes from +4 to?

Options:
A 0
B +1
C +83
D +2

The correct answer is:
+83

Solution:
3MnO2âMn3O4+O2
In MnO2 oxidation number of Mn is +4 and in Mn3O4 it is +83 .

Topic: Chemistry, d and f Block Elements, NEET
When MnO42- (1 mole) in neutral aqueous medium is disproportionate, the product obtained is

Options:
A 2/3 mole of MnO4- and 1/3 mole of MnO2
B 1/3 mole of MnO4- and 2/3 mole of MnO2
C 1/3 mole of Mn2O7 and 1/3 mole of MnO2
D 2/3 mole of Mn2O7 and 1/3 mole of MnO2

The correct answer is:
2/3 mole of MnO4- and 1/3 mole of MnO2

Solution:
3MnO 4 −2  +  4H +  →  2MnO 4 −  +  MnO 2  +  2H 2 O
MnO42- in neutral aqueous medium is disproportionate to 23 mole of MnO4- and 13 mole of MnO2.

Topic: Chemistry, d and f Block Elements, NEET
When m-chlorobenzaldehyde is treated with $50 \% \mathrm{KOH}$ solution, the products (s) obtained is (are):

Options:
A

B

C

D

The correct answer is:

Solution:
When m-chlorobenzaldehyde is treated with $50 \% \mathrm{KOH}$ solution, the product(s) obtained are potassium metachloro benzoate and metachloro benzyl alcohol. It undergoes Cannizzaro reaction in which one molecule is oxidized to metachloro benzoic acid and other molecule is reduced to metachloro benzyl alcohol.
Related Theory
The Cannizzaro reaction is not given by Acetaldehyde. Aldehydes that contains alpha hydrogen atoms are not involved in Cannizzaro reaction and aldehyde like acetaldehyde contains alpha hydrogen in it.
Caution
m-chlorobenzaldehyde has no $\alpha$-hydrogen and hence gives Cannizzaro's reaction.

Topic: Chemistry, Aldehydes and Ketones, NEET, NEET 2003
When Mendel self hybridised the F₁ plants, what ratio of yellow and green seeds did he observe in the F₂ generation?

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

The correct answer is:
3:1

Solution:
Mendel observed a 3:1 segregation ratio for yellow and green seeds in the F₂ generation.

Topic: Biology, Principles of Inheritance and Variation, NEET
When mercuric iodide is added to the aqueous solution of potassium iodide, the

Options:
A Freezing point is raised
B Freezing point is lowered
C Freezing point does not change
D Boiling point does not change

The correct answer is:
Freezing point is raised

Solution:
2KIaq+HgI2(s)â¶K2HgI4(aq)
No. of particles of solute are decreasing, hence all colligative properties would decrease

Topic: Chemistry, Solutions, NEET
When mercuric iodide is added to the aqueous solution of potassium iodide the

Options:
A Freezing point is raised
B Freezing point is lowered
C Freezing point does not change
D Boiling point does not change

The correct answer is:
Freezing point is raised

Solution:
When mercuric iodide is added to the aqueous solution of potassium iodide the freezing point is raised as ÎTf decreases due to complex formation number of species decrease and molecular weight increases.
ΔT f ∝ 1 Molecular weight ∝ number of species
HgI2 although insoluble in water but shows complex formation with KI as
2KIâ+â HgI 2 â K 2 HgI 4
2KIâ 2K + +2I â â(4âions)
K 2 HgI 4 â 2K + HgI 4 â2 â(3âions)
Here number of species decreases due to the reaction. Hence, ÎT f â and T f â

Topic: Chemistry, Solutions, NEET
When mercuric iodide is added to the aqueous solution of potassium iodide, the

Options:
A freezing point is raised
B freezing point does not change
C freezing point is lowered
D boiling point does not change

The correct answer is:
freezing point is raised

Solution:
When mercuric iodide is added to aqueous solution of Potassium iodide, the freezing point of solution will increase.
Potassium iodide ionizes in water as
KI→K++I-
When HgI2 is added to it, it forms complex with KI
2KI+HgI2→K2[HgI4]⇌2K++[HgI4]-2
Hence, number of particle will decrease from 4 to 3. So, there would be less depression in freezing point and freezing point will increase.

Topic: Chemistry, Solutions, NEET