datavorous/entrance-exam-dataset huggingface dataset:
In the reaction of acidic dehydration of alcohols, what role does the concentrated sulfuric acid play?

Options:
A It acts as a catalyst.
B It acts as a reducing agent.
C It acts as an oxidizing agent.
D It acts as a dehydrating agent.

The correct answer is:
It acts as a dehydrating agent.

Solution:
Concentrated sulfuric acid plays the role of a dehydrating agent in the acidic dehydration of alcohols, promoting the removal of water from the alcohol molecules.

Topic: Chemistry, Hydrocarbons, NEET
In the reaction of aldehydes and ketones with hydrogen cyanide (HCN), what is the role of the cyanide ion (CN-)?

Options:
A It acts as a catalyst
B It acts as a reducing agent
C It acts as a nucleophile
D It acts as a solvent

The correct answer is:
It acts as a nucleophile

Solution:
The cyanide ion (CN-) in the reaction acts as a nucleophile, adding to the carbonyl compounds.

Topic: Chemistry, Aldehydes, Ketones and Carboxylic Acids, NEET
In the reaction of alkenes with water in the presence of an acid catalyst, what is the catalyst's role?

Options:
A To oxidize alkenes
B To reduce alkenes
C To promote hydration
D To form hydrogen gas

The correct answer is:
To promote hydration

Solution:
In the reaction of alkenes with water in the presence of an acid catalyst, the catalyst's role is to promote hydration, as described in the passage.if !supportLineBreakNewLine

Topic: Chemistry, Redox Reactions, NEET
In the reaction of Cl2 on CH4 in sunlight, which of the following compound is not formed

Options:
A CHCl3
B CH3Cl
C CH3CH3
D CH3CH2CH3

The correct answer is:
CH3CH2CH3

Solution:
CH4âCl2CH3ClâCl2CH2Cl2âCl2CHCl3âCl2CCl4
Since this reaction takes place by free radical mechanism. Hence, there is a possibility of formation of ethane.
C • H 3  +  C • H 3 Methyl free radicals → CH 3 − CH 3 Ethane

Topic: Chemistry, Hydrocarbons, NEET
In the reaction of chlorine with an alkene, what type of bond is formed between chlorine and carbon atoms?

Options:
A Single bond
B Double bond
C Triple bond
D Covalent bond

The correct answer is:
Single bond

Solution:
In the reaction of chlorine with an alkene, a single covalent bond is formed between chlorine and carbon atoms.

Topic: Chemistry, Hydrocarbons, NEET
In the reaction of glucose with bromine water, what type of chemical transformation occurs?

Options:
A Reduction
B Dehydration
C Oxidation
D Hydrolysis

The correct answer is:
Oxidation

Solution:
Glucose undergoes oxidation in the presence of bromine water.

Topic: Chemistry, Biomolecules, NEET
In the reaction of phenol with sodium hydroxide, what role does sodium hydroxide play?

Options:
A Sodium hydroxide acts as a reducing agent.
B Sodium hydroxide acts as a catalyst.
C Sodium hydroxide acts as a base.
D Sodium hydroxide acts as an acid.

The correct answer is:
Sodium hydroxide acts as a base.

Solution:
Sodium hydroxide acts as a base by accepting a proton from phenol.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
In the reaction PCl3+Cl2⟶PCl5, which of the following is correct?

Options:
A PCl3 is acting as a reductant.
B Cl2 is acting as a reductant.
C Both PCl3 and Cl2 are acting as reductants.
D Both PCl3 and Cl2 are acting as oxidants.

The correct answer is:
PCl3 is acting as a reductant.

Solution:
P+3Cl3+Cl02â¶P+5Cl5
The oxidation state of P changing from +3 to +5 i.e. increase in oxidation number by +2 So PCl 3 is oxidized and hence PCl3 acts as a reductant.

Topic: Chemistry, Redox Reactions, NEET
In the reaction, SO2+2H2S→3S+2H2O , which choice has value twice that of equivalent mass of oxidising agent?

Options:
A 64 g
B 32 g
C 48 g
D 16 g

The correct answer is:
32 g

Solution:
SO2+4+2H2S→3S0+2H2O
Equivalent mass of SO 2 = Molecular mass Change in oxidation number
=644=16 g.

Topic: Chemistry, Redox Reactions, NEET
In the reaction sequence
C 6 H 5 Small – CH 3 → Cl 2 /hv X → HOH/NaOH Y
[X] and [Y] will respectively be :

Options:
A C6H5âCH2Cl and C6H5âCH2OH
B C6H5âCH2Cl and C6H5âCHO
C C6H5âCCl3 and C6H5COOH
D C6H5CCl3 and C6H5COONa

The correct answer is:
C6H5CCl3 and C6H5COONa

Solution:
Here sodium benzoate is formed as the product Y

Topic: Chemistry, Hydrocarbons, NEET
In the reaction sequence
CH3–C≡C–H→NaNH2X→HCHOY
[Y] will be

Options:
A CH3–CH=CH2
B CH3–C≡C–CH2OH
C CH3–C≡C–CHO
D CH3–C≡C–COONa

The correct answer is:
CH3–C≡C–CH2OH

Solution:
Here Y is but-2-yne-1-ol and the reaction is as follows

Topic: Chemistry, Hydrocarbons, NEET
In the reaction sequence
CH3–CH2–COOH→H2O2X→ΔY
[Y] will be

Options:
A
B CH2=CH–COOH
C
D Lactide

The correct answer is:
CH2=CH–COOH

Solution:
Here Y is prop-2-enoic-acid

Topic: Chemistry, Carboxylic Acid Derivatives, NEET
In the reaction sequence
CH3CHO→NH2OH/H⊕A→P2O5/ΔB , B will be

Options:
A CH3CH=NOH
B H2C=NOH
C CH3CN
D CH3CH2NH2

The correct answer is:
CH3CN

Solution:
Here the compound B is CH3CN
CH3-CHOâNH2OH/HâCH3-CH=N-OHâP2O5CH3-Câ¡N+H2O

Topic: Chemistry, Aldehydes and Ketones, NEET
In the reaction sequence

CH≡CH+CH≡CH→Cu2Cl2(A)→HCl(B) , 'B' will be

Options:
A
B
C CH2=CH-C≡C-Cl
D CH3-CH2-C≡C-Cl

The correct answer is:

Solution:
Here the compound B is (monomer of Neoprene) and the reaction is as follows

Topic: Chemistry, Hydrocarbons, NEET
In the reaction sequence
CH3-Câ¡C-HâCH3MgBrCH4+(A)âii H2O/H+i CO2(B)
B will be

Options:
A CH3-C≡C-CH3
B CH3-C≡C-MgBr
C CH3-C≡C-COOH
D CH3-CH=CH-COOH

The correct answer is:
CH3-C≡C-COOH

Solution:
Here the compounds A and B are as follows
CH3-Câ¡C-HâCH3MgBr-CH4CH3-Câ¡C-MgBr(A)âii H2O/H+(i) CO2CH3-Câ¡C-COOH(B)

Topic: Chemistry, Hydrocarbons, NEET
In the reaction sequence
CH 3 − CH 2 − CH 2 −Br → AgCN X → H 2 O/ OH − Y
(Y) will be

Options:
A CH3-CH2-CH2-NH2
B CH3-CH2-NH2
C CH3-(CH2)2-CH2-NH2
D CH3-(CH2)3-CH2-NH2

The correct answer is:
CH3-CH2-CH2-NH2

Solution:
Here X is propyl isocyanide and Y is propyl amine
CH3-CH2-CH2-Br→AgCNCH3-CH2-CH2-N⊕≡C-(X)→H2O/O-H/ΔCH3-CH2-CH2-NH2(Y)+HCOOH

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
In the reaction sequence
Cyclohexane → hv/ Cl 2 (A) → alk.KOH/Δ (B) → (ii) Zn/ H 2 O (i)  O 3 (C) , 'C' will be

Options:
A Hexanal
B 2-Hexanone
C 3-Hexanone
D Hexane-1,6-dial

The correct answer is:
Hexane-1,6-dial

Solution:
Here the final product C is hexane 1,6-dinal and it is formed as follows

Topic: Chemistry, Hydrocarbons, NEET
In the reaction sequence product (P) will be

Options:
A C6H5-CH3
B C6H5-CH2-CH3
C C6H5-CH2-CHO
D C6H5-CH=CH2

The correct answer is:
C6H5-CH2-CH3

Solution:
Here the product P is ethylbenzene.

Topic: Chemistry, Hydrocarbons, NEET
In the reaction sequence

Options:
A
B
C
D

The correct answer is:

Solution:
It involves Markonikov addition to give ketone as follows

Topic: Chemistry, Hydrocarbons, NEET
In the reaction, the electrophile involved is

Options:
A Dichloromethyl anion C⊝HCl2
B Formyl cation (C⊕HO)
C Dichloromethyl cation (C⊕HCl2)
D Dichlorocarbene :CCl2

The correct answer is:
Dichlorocarbene :CCl2

Solution:
The Reimer Tiemann reaction is an organic chemical reaction where phenol is converted into an ortho hydroxy benzaldehyde using chloroform, a base, and acid workup. This results in a nucleophilic attack on the dichlorocarbene, forming an intermediate dichloromethyl substituted phenol.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET, NEET 2018
In the reaction

The electrophile involved is

Options:
A Dichloromethyl anion (C⊕HCl2)
B Formyl cation (C⊕HO)
C Dichloromethyl cation (C⊕HCl2)
D Dichlorocarbene (:CCl2)

The correct answer is:
Dichlorocarbene (:CCl2)

Solution:
It is Reimer-Tiemann reaction and the electrophile (reaction intermediate) formed is :CCl2 (Dichlorocarbene) according to the following reaction

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
In the reaction, the product P is

Options:
A
B
C
D

The correct answer is:

Solution:
It is birch reduction.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
In the reaction:

Then which of the following aryl halide is most reactive?

Options:
A Ar-I
B Ar-Cl
C Ar-F
D Ar-Br

The correct answer is:
Ar-F

Solution:
Since F is most electronegative it will increase the positive charge density on ring carbon atom and will also stabilize the resulting intermediate thus Ar-F is most reactive.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
In the reaction to produce calcium carbide, what is the purpose of heating quick lime with coke?

Options:
A To produce ethyne
B To obtain calcium oxide
C To form calcium hydroxide
D To generate carbon monoxide

The correct answer is:
To obtain calcium oxide

Solution:
The heating of quick lime with coke is done to obtain calcium oxide (CaO) as one of the products, and the primary purpose of this reaction is to produce calcium oxide.

Topic: Chemistry, Hydrocarbons, NEET
In the reaction with AgCl, what is the physical state of AgCl formed?

Options:
A Solid
B Liquid
C Gas
D Aqueous solution

The correct answer is:
Solid

Solution:
The paragraph mentions that AgCl formed when ammonia reacts with Ag+ ions is a solid.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
In the reaction with HCl, an alkene reacts following the Markovnikov's rule to give the product 1-chloro-1-methylcyclohexane. The possible reaction of the alkene is

Options:
A
B
C and
D

The correct answer is:
and

Solution:
The Markovnikov's rule asserts that with the addition of a protic acid HX to an asymmetric alkene, the acid hydrogen (H) gets attached to the carbon with more hydrogen substituents and the halide (X) group gets attached to the carbon with more alkyl substituents.

Topic: Chemistry, Hydrocarbons, NEET, NEET 2015 (Phase 2)
In the reaction with primary amine, what type of sulphonamide is formed?

Options:
A N-ethyl benzene sulfonyl amide
B N,N-diethyl benzene sulphonamide
C N-methylbenzenesulphonyl amide
D N,N-dimethyl benzenesulfonamide

The correct answer is:
N-ethyl benzene sulfonyl amide

Solution:
The reaction of benzenesulfonyl chloride with a primary amine yields N-ethylbenzenesulphonyl amide.

Topic: Chemistry, Amines, NEET
In the reaction

X and Y are:

Options:
A X = 1 - Butyne ; Y = 3 - Hexyne
B X = 2 - Butyne ; Y = 3 - Hexyne
C X = 2 - Butyne ; Y = 2 - Hexyne
D X = 1 - Butyne ; Y = 2 - Hexyne

The correct answer is:
X = 1 - Butyne ; Y = 3 - Hexyne

Solution:
Terminal alkynes on reaction with NaNH2/liq.NH3 results in the formation of sodium acetylides, and these sodium acetylides undergo nucleophilic substitution react with alkyl halides to form higher alkynes.

Topic: Chemistry, Hydrocarbons, NEET, NEET 2016 (Phase 1)
In the reduction half-reaction, how many electrons are added to balance the charge when Cr2O72- ions are reduced to Cr3+ ions?

Options:
A 2 electrons
B 6 electrons
C 12 electrons
D 14 electrons

The correct answer is:
6 electrons

Solution:
In the reduction half-reaction, 6 electrons are added to balance the charge when Cr2O72- ions are reduced to Cr3+ ions.

Topic: Chemistry, Redox Reactions, NEET
In the reduction of alkynes to alkenes using Lindlar's catalyst, what is the role of quinoline?

Options:
A It is a reactant.
B It is a catalyst.
C It is a poison to deactivate the catalyst.
D It is a solvent.

The correct answer is:
It is a poison to deactivate the catalyst.

Solution:
Quinoline is used as a poison to partially deactivate the catalyst (palladised charcoal) in Lindlar's catalyst to ensure selective hydrogenation.

Topic: Chemistry, Hydrocarbons, NEET
In the reduction of phenol to benzene, what type of reaction is occurring?

Options:
A Combustion
B Substitution
C Hydrogenation
D Dehydrogenation

The correct answer is:
Dehydrogenation

Solution:
The reduction of phenol to benzene is a dehydrogenation reaction, as it involves the removal of hydrogen from the phenol molecule.

Topic: Chemistry, Hydrocarbons, NEET
In the reduction of propyne using Pd/C, what is the product formed?

Options:
A Propane
B Propene
C 1-Butene
D 2-Butene

The correct answer is:
Propene

Solution:
The reduction of propyne (CH3C≡CH) using palladised charcoal (Pd/

Topic: Chemistry, Hydrocarbons, NEET
In the Reimer-Tiemann reaction, what happens to the benzal chloride intermediate to produce salicylaldehyde?

Options:
A It is reduced to form salicylaldehyde.
B It is oxidised to form salicylaldehyde.
C It is hydrolyzed in the presence of alkali.
D It undergoes decarboxylation.

The correct answer is:
It is hydrolyzed in the presence of alkali.

Solution:
The benzal chloride intermediate is hydrolyzed in the presence of alkali to produce salicylaldehyde in the Reimer-Tiemann reaction.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
In the relation : dy dx = 2 Ï sin Ï t + Ï 0 the dimensional formula for Ï t + Ï 0 is :

Options:
A MLT

B MLT0

C ML0T0

D M0L0T0

The correct answer is:
M0L0T0

Solution:
Unit of an angle is radian, it is a dimension less quantity
So Ï t + Ï 0 is dimensionless.

Topic: Physics, Units and Dimensions, NEET
In the relation p=Î±Î² e-Î±zkÎ¸, p is the pressure, z the distance, k is Boltzmann constant and Î¸ is the temperature, the dimensional formula of Î² will be

Options:
A M0L2T0
B ML2T
C ML0T-1
D ML2T-1

The correct answer is:
M0L2T0

Solution:
In given equation, azkθ should be dimensionless
α=kθz
⇒ α=ML2T-2K-1×KL=MLT-2
And p=αβ
⇒ β=αp=MLT-2ML-1T-2=M0L2T0

Topic: Physics, Units and Dimensions, NEET
In the renal tubules, the permeability of the distal convoluted tubule and collecting duct to water is controlled by

Options:
A Vasopressin (ADH)
B Aldosterone
C Growth hormone
D Renin

The correct answer is:
Vasopressin (ADH)

Solution:
The growth hormone, released by the anterior lobe of the pituitary brings about body growth by synthesis and deposition of proteins in tissues. Renin secreted by special cells in kidneys regulates blood pressure. Aldosterone reduces Na+ elimination by helping active reabsorption from the nephric filtrate.

Topic: Biology, Excretory Products and their Elimination, NEET
In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed, would drive:

Options:
A $\mathrm{K}^{+}$into the cell
B $\mathrm{K}^{+}$and $\mathrm{Na}^{+}$out of the cell
C $\mathrm{Na}^{+}$into the cell
D $\mathrm{Na}^{+}$out of the cell.

The correct answer is:
$\mathrm{Na}^{+}$into the cell

Solution:
In the resting nerve fibre, the cytoplasm inside the axon has a high concentration of $\mathrm{K}^{+}$and a low concentration of $\mathrm{Na}^{+}$in contrast to the fluid outside the axon. Thus, if diffusion occurs the through concentration gradient $\mathrm{Na}^{+}$enters the fibre.
Related Theory
The sodium-potassium pump is a mechanism of active transport that moves sodium ions out of cells and potassium ions into cells. The sodium-potassium pump moves both ions from areas of lower to higher concentration, using energy in ATP and carrier proteins in the cell membrane. Sodium is the principal ion in the fluid outside of cells, and potassium is the principal ion in the fluid inside of cells. These differences in concentration create an electrical gradient across the cell membrane, called resting potential.

Topic: Biology, Neural Control and Coordination, NEET, NEET 2004
In the retina, the membrane potentials are first generated in:

Options:
A Photoreceptors
B Ganglion cells
C Bipolar neurons
D Muller cells

The correct answer is:
Photoreceptors

Solution:
Mechanism of vision:
Light rays (of the visible spectrum) are focussed on the retina via passing through the cornea and lens â Light-induced dissociation of photosensitive compounds [(photopigments composed of opsin (a protein) and retinal (an aldehyde of vitamin A)] into retinal and opsin â Structural changes in opsin â Changes in membrane permeability â Potentials are generated in photoreceptor cells (rods and cones) â Production of a signal crosses the bipolar cells and reaches the ganglion cells â Generation of action potentials in the ganglion cells â Transmission of these action potentials (impulses) by the optic nerves up to the visual cortex area of the brain for the analysis.

Topic: Biology, Neural Control and Coordination, NEET
In the Rosenmund's reaction

RCOCl+H2âPd/BaSO4 RCHO+HCl

Here, BaSO4 is

Options:
A Promotes catalytic activity of Pd
B Removes the HCl formed in the reaction
C Deactivates Pd
D Activates Pd

The correct answer is:
Deactivates Pd

Solution:
RCOCl+H2âPd/BaSO4 RCHO+HCl
In this reaction, BaSO4 decreases the activity of palladium.

Topic: Chemistry, Aldehydes and Ketones, NEET
In the second method for detecting sulfur, what color indicates the presence of sulfur when sodium nitroprusside is added to the sodium fusion extract?

Options:
A Red
B Black
C Violet
D Yellow

The correct answer is:
Violet

Solution:
The appearance of a violet color further indicates the presence of sulfur when sodium nitroprusside is added to the sodium fusion extract.

Topic: Chemistry, General Organic Chemistry, NEET
In the series L-C-R circuit shown in the figure, the rms voltage across the resistor and inductor are 400 V and 700 V respectively. If the applied voltage is E=5002 sinÏt, then the peak voltage across the capacitor is

.

Options:
A 1200 V
B 12002 V
C 400Â V
D 4002 V

The correct answer is:
4002 V

Solution:
.VR2+(VL-VC)2=Erms2
VL â VC2=5002 â 4002
VL â VC=(500)2-(400)2=300
VC=VL â 300=700 â 300=400
â´ V C peak = 2 V c = 2 Ã 4 0 0 volts

Topic: Physics, Alternating Current, NEET
In the series of reaction X and Y are respectively are
C6H5NH2→NaNO2/HClX→HNO2Y+N2+HCl

Options:
A C6H5-N=N-C6H5,C6H5N2⊕ClΘ
B C6H5N2⊕ClΘ,C6H5-N=N-C6H5
C C6H5N2⊕ClΘ,C6H5NO2
D C6H5NO2,C6H6

The correct answer is:
C6H5N2⊕ClΘ,C6H5NO2

Solution:
C6H5NH2→NaNO2/HClC6H5N2+Cl-(X)→HNO2C6H5NO2(Y)+N2+HCl

Topic: Chemistry, Amines, NEET
In the series Sc (Z = 21) to Zn (Z = 30), the enthalpy of atomisation of zinc is the lowest, i.e., 126 kJ mol–1. Why?

Options:
A because in the formation of metallic bonds, no electrons from 3d-orbitals are involved in the case of zinc unlike the rest of the series
B because Zinc has a smaller atomic radius compared to scandium.
C because Zinc has a completely filled d-subshell in its ground state electron configuration.
D because Zinc exhibits fewer oxidation states compared to scandium.

The correct answer is:
because in the formation of metallic bonds, no electrons from 3d-orbitals are involved in the case of zinc unlike the rest of the series

Solution:
Correct Option is : (A)
because in the formation of metallic bonds, no electrons from 3d-orbitals are involved in the case of zinc unlike the rest of the series

Topic: Chemistry, d and f Block Elements, NEET
In the set of molecules with different functional groups(having approximately equal molecular weight), the order of boiling point is compared on the basis of strength of intermolecular forces. Which of the following is the correct order?

Options:
A Hydrogen bonding>Ion-dipole>Dipole-dipole>London forces
B Hydrogen bonding>Ion-dipole>London forces>Dipole-dipole
C Ion-dipole>Hydrogen bonding>Dipole-dipole>London forces
D Hydrogen bonding>Dipole-dipole>Ion-dipole>London forces

The correct answer is:
Ion-dipole>Hydrogen bonding>Dipole-dipole>London forces

Solution:
Correct Option is : 3
Ion-dipole>Hydrogen bonding>Dipole-dipole>London forces

Topic: Chemistry, Amines, NEET
In the setup described in Fig. 4.3, a long straight wire carrying a current of 25A is placed on a table. Another wire PQ of length 1m and mass 2.5g also carries the same current but in the opposite direction. The wire PQ is free to slide up and down. What will be the height to which PQ will rise?

Options:
A 0.15 cm
B 0.25 cm
C 0.51 cm
D 0.75 cm

The correct answer is:
0.51 cm

Solution:
Correct Option is : (C)
0.51 cm

Topic: Chemistry, Magnetic Effects of Current, NEET
In the shown figure, if all the surfaces are smooth and the two masses are allowed to move then centre of mass of the system will move

Options:
A upwards
B downwards
C leftwards
D rightwards

The correct answer is:
downwards

Solution:
As the surfaces are smooth therefore there is no horizontal force on the system but as the block slides down the center of mass shifts downwards.

Topic: Physics, Center of Mass Momentum and Collision, NEET
In the shown figure, the charge appearing on the conducting shell (grounded) of Radius R, when a point charge q is kept at a distance of d from the centre of the sphere is:

Options:
A q

B qd r
C - qr d
D 0

The correct answer is:
- qr d

Solution:
The net potential on the surface of earthed conductor is zero.
∴ V = q 0 4 π ε 0 r + q 4 π ε 0 d = 0
∴ q 0 = - qr d

Topic: Physics, Electrostatics, NEET
In the shown indicator diagram over pressure-volume scales ‘n' moles of an ideal gas is cycled. If the temperature of the gas in the state X and Y are respectively TX and TY . Temperature of the gas in the state Z is the (All temperature are in absolute scale)

Options:
A Arithmetic mean of Tx and Ty
B Geometric mean of Tx and Ty
C Harmonic mean of Tx and Ty
D None of the above is correct

The correct answer is:
Geometric mean of Tx and Ty

Solution:
PxVx=nRTx
PyVy=nRTy
PzVz=nRTz
As Px=Pz and Vz=Vy and PxVx=PyVy
∴Tz2=TxTy

Topic: Physics, Thermal Properties of Matter, NEET
In the SI system, what is the symbol for the mole?

Options:
A S
B M
C Mo
D mol

The correct answer is:
mol

Solution:
In the SI system, the symbol for the mole is "mol."

Topic: Chemistry, Some Basic Concepts of Chemistry, NEET
In the silver plating of copper, $\mathrm{K}\left[\mathrm{Ag}\left(\mathrm{CN}_2\right]\right.$ is used instead of $\mathrm{AgNO}_3$. The reason is:

Options:
A a thin layer of $\mathrm{Ag}$ is formed on $\mathrm{Cu}$
B more voltage is required
C $\mathrm{Ag}^{+}$ions are completely removed from solution
D less availability of $\mathrm{Ag}^{+}$ions, as $\mathrm{Cu}$ cannot displace $\mathrm{Ag}$ from $\left[\mathrm{Ag}\left(\mathrm{CN}_2\right]^{-}\right.$ ion

The correct answer is:
less availability of $\mathrm{Ag}^{+}$ions, as $\mathrm{Cu}$ cannot displace $\mathrm{Ag}$ from $\left[\mathrm{Ag}\left(\mathrm{CN}_2\right]^{-}\right.$ ion

Solution:
Copper being more electropositive readily precipitate silver from their salt \(\left(\mathrm{Ag}^{+}\right)\) solution.
\(\mathrm{Cu}+2 \mathrm{AgNO}_3 \rightarrow \mathrm{Cu}\left(\mathrm{NO}_3\right)_2+\mathrm{Ag}\)
In \(\mathrm{K}\left[\mathrm{Ag}(\mathrm{CN})_2\right]\) solution a complex anion \(\left[\mathrm{Ag}(\mathrm{CN})_2\right]\) is formed so \(\mathrm{Ag}^{+}\) ions are less available in the solution and Cu cannot displace Ag from this complex ion.

Topic: Chemistry, Coordination Compounds, NEET, NEET 2002
In the special mode of reproduction observed in lemons, the embryos develop directly from the

Options:
A nucellus
B zygote
C synergids or antipodals in an embryo sac
D accessory embryo sacs in the ovule.

The correct answer is:
nucellus

Solution:
Although seeds, in general are the products of fertilisation, a few flowering plants such as some species of Asteraceae and grasses, have evolved a special mechanism, to produce seeds without fertilisation, called apomixis. In some species, the diploid egg cell is formed without reduction division and develops into the embryo without fertilisation. More often, as in many Citrus and Mango varieties some of the nucellar cells surrounding the embryo sac start dividing, protrude into the embryo sac and develop into the embryos.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
In the spectrochemical series, the magnitude of the crystal field splitting is maximum for which ion?

Options:
A Cl-
B F-
C NO2
D CN-

The correct answer is:
CN-

Solution:
CN- ion is at the extreme right but before CO in the spectrochemical series. So, it can cause maximum splitting of d-orbitals.
C-N>NO2->F->Cl-

Topic: Chemistry, Coordination Compounds, NEET
In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is:

Options:
A 94
B 275
C 527
D 49

The correct answer is:
527

Solution:
1λ1=Re112-122
1λ2=Re122-132
λ1λ2=527

Topic: Physics, Atomic Physics, NEET, NEET 2015 (Phase 2)