datavorous/entrance-exam-dataset huggingface dataset:
When a tall plant was self-pollinated, one-fourth of the progeny were dwarf. The genotypes of the parent and dwarf progenies are

Options:
A

TT, Tt

B

Tt, tt

C

Tt, Tt

D

TT, TT

The correct answer is:

Tt, tt

Solution:
Dominance in genetics is a relationship between alleles of a gene, in which one allele masks the expression (phenotype) of another allele at the same locus. In this case, where a gene exists in two allelic forms (designated T and t). Allele T is dominant over t.
The genotype of a tall parent could be homozygous TT or heterozygous Tt. But, since on doing itâs self-cross, one-fourth of the progeny obtained has been found to be dwarf. Thus, its genotype must have been Tt.
The genotype of dwarf progeny would be tt. Allele t is recessive; therefore, it would be expressed only in the homozygous state.

Topic: Biology, Principles of Inheritance and Variation, NEET
When a thin transparent sheet of refractive index μ=32 is placed near one of the slit in YDSE, the intensity at centre of screen reduces to half of maximum intensity. Then, minimum thickness of sheet should be

Options:
A λ4
B λ8
C λ2
D λ3

The correct answer is:
λ2

Solution:
lR=4l0cos2â¡ÎÎ¸2
As given lR at centre is 2l0 , then 2l0=4l0cos2â¡ÎÎ¸2
â ÎÎ¸2=Ï4 [for minimum result]
ÎÎ¸=Ï2
Îx=ÎÎ¸ÃÎ»2Ï=Î»4
For slab Îx=Î¼-1t
32-1t=Î»4
t=Î»2

Topic: Physics, Wave Optics, NEET
When a train is at a distance of 2 km, its engine sounds a whistle. A man near the railway track hears the whistle directly and by placing his ear against the track of the train. If the two sounds are heard at an interval of 5.2 s, the speed of the sound in iron (material of the rail track) is:
(Given that velocity of sound in air is 330 m s -1.)

Options:
A 2,325.6 m s-1
B 1,932.4 m s-1
C 2,132.5 m s-1
D 3,213.2 m s-1

The correct answer is:
2,325.6 m s-1

Solution:
Here, S = 2 km = 2,000 m ; vair = 330 m s-1
Therefore, time taken by sound to travel through air,
t air = S v air = 2,000 330 = 6.06 s
As the two sounds (through air and iron rails) are heard at an interval of 5.2 s, time taken by sound to travel through iron rails,
tiron = tair - 5.2
= 6.06 - 5.2 = 0.86 s
Therefore, velocity of sound in iron,
V iron = S t iron = 2,000 0.86
= 2,325.6 m s-1

Topic: Physics, Waves and Sound, NEET
When a truck is pulling a car out of a ditch using a 9.1 m long steel cable with a radius of 5 mm, and a Young's modulus for steel of 2 × 1011Nm, at what length has the cable stretched when the tension in the cable is 800 N and the car just begins to move?

Options:
A 0.2 × 103m
B 0.5 × 103m
C 0.9 × 103m
D 1.2 × 103m

The correct answer is:
0.5 × 103m

Solution:
Correct Option is : (B)
0.5 × 103m

Topic: Chemistry, Mechanical Properties of Solids, NEET
When a U238 nucleus, originally at rest, decays by emitting an α-particle, say with speed of v m/sec, the recoil speed of the residual nucleus is (in m/sec.)

Options:
A -4 v/234
B -4Â v/238
C 4v/238
D -v/4

The correct answer is:
-4 v/234

Solution:
In absence of external force momentum of system will conserved
From m1v1+m2v2=0
v2=-m1v1m2=-4v234

Topic: Physics, Center of Mass Momentum and Collision, NEET
When a uranium isotope U92235 is bombarded with a neutron, it generates Kr3689, three neutrons and:

Options:
A Zr4091
B Kr36101
C Kr36103
D Ba56144

The correct answer is:
Ba56144

Solution:
Let mass number & atomic number of the unknown element be A & Z.

A = 235-89-(3×1)=143

Z = 92-36=56

Hence, the element must be Barium.

U92235+01n→Kr3689+Ba56144+301n+Q

Topic: Physics, Nuclear Physics, NEET, NEET 2020 (Phase 1)
When a vector takes up foreign DNA segment then it is known as?

Options:
A De-recombinant DNA
B Hybrid DNA-RNA
C Vector DNA
D Recombinant vector DNA

The correct answer is:
Recombinant vector DNA

Solution:
When a vector takes up foreign DNA it is called a recombinant vector or chimeric vector. Foreign DNA is inserted into a cloning site present in a vector which is identified by a specific restriction endonuclease.

Topic: Biology, Biotechnology - Principles and Processes, NEET
When a viral DNA is incorporated inside the host DNA, it is known as:

Options:
A Phycophages
B Cyanophages
C Prophage
D Vegphage

The correct answer is:
Prophage

Solution:
In virus showing temperate or lysogenic cycle viral DNA gets intergrated into host DNA and is transmitted as such to next generation, such viral DNA is called prophage.

Topic: Biology, Biotechnology - Principles and Processes, NEET
When a wire of uniform cross section $a$, length $l$ and resistance $R$ is into a complete circle, resistance between any two of diametrically opposite point will be:

Options:
A $\frac{R}{4}$
B $4 R$
C $\frac{R}{8}$
D $\frac{R}{2}$

The correct answer is:
$\frac{R}{4}$

Solution:
Both are in parallel
$$
\begin{aligned}
& \frac{1}{R^{\prime}}=\frac{2}{R}+\frac{2}{R}=\frac{4}{R} \\
& \Rightarrow \quad R^{\prime}=\frac{R}{4}
\end{aligned}
$$

Topic: Physics, Current Electricity, NEET, NEET 2005
When acetaldehyde is treated with Fehlingâs solution, it gives a precipitate of

Options:
A Cu
B CuO
C Cu2O
D Cu + Cu2O + CuO

The correct answer is:
Cu2O

Solution:
When acetaldehyde is treated with Fehlingâs solution, it gives a red precipitate of Cu2O .

Topic: Chemistry, Aldehydes and Ketones, NEET
When acetone and chloroform are mixed together, H-bonding takes place between them. Such a liquid pair shows

Options:
A +ve deviation from Raoult's law
B -ve deviation from Raoult's law
C no deviation from Raoult's law
D slight increase in volume

The correct answer is:
-ve deviation from Raoult's law

Solution:
When acetone and chloroform are mixed together, H-bonding takes place between them. Such a liquid pair shows -ve deviation from Raoult's law due to increase in the inter-molecular force, the rate of evaporation is lowered, thus, the solution of acetone and chloroform will give negative deviation.

Topic: Chemistry, Solutions, NEET
When acetone and chloroform are mixed together, which of the following observation is correct?

Options:
A A-A and B-B interactions are stronger than A-B interactions
B A-A and B-B interactions are weaker than A-B interactions
C A-A,B-B and A-B interactions are equal
D The liquids form separate layers and are immiscible

The correct answer is:
A-A and B-B interactions are weaker than A-B interactions

Solution:
When acetone and chloroform are mixed together, a hydrogen bond is formed between them which increases intermolecular interactions. Hence, A-B interactions are stronger than A-A and A-B interactions.

Topic: Chemistry, Aldehydes and Ketones, NEET
When alkanes undergo complete combustion, which gas is produced as a result?

Options:
A Carbon monoxide
B Carbon dioxide
C Methane
D Hydrogen

The correct answer is:
Carbon dioxide

Solution:
Complete combustion of alkanes produces carbon dioxide (CO2) as a result.

Topic: Chemistry, Hydrocarbons, NEET
When alkenes react with potassium permanganate (Baeyer's reagent), what functional group is introduced into the molecule?

Options:
A Aldehyde
B Ketone
C Alcohol
D Carboxylic acid

The correct answer is:
Alcohol

Solution:
When alkenes react with potassium permanganate (Baeyer's reagent), alcohols are introduced into the molecule through the process of oxidation.

Topic: Chemistry, Hydrocarbons, NEET
When alkyl halides react with aromatic compounds in presence of anhydrous AlCl3 , the reaction is known as

Options:
A Friedal-Craft reaction
B Hofmann degradation
C Kolbe’s synthesis
D Beckmann rearrangement

The correct answer is:
Friedal-Craft reaction

Solution:
Acylation or alkylation of aromatic compound in presence of AlCl3 is known as Friedal-craft reaction.

Topic: Chemistry, Hydrocarbons, NEET
When alkynes are reduced with sodium in liquid ammonia, what type of alkenes are formed?

Options:
A Cis alkenes
B Trans alkenes
C Cyclic alkenes
D Branched alkenes

The correct answer is:
Trans alkenes

Solution:
Alkynes, when reduced with sodium in liquid ammonia, form trans alkenes.

Topic: Chemistry, Hydrocarbons, NEET
When all parts except the leaves of a short-day plant are covered with a light-proof cover and then subjected to short daylight/dark treatment, it will produce flower buds. When a portion of this plant is grafted on to another plant of the same species which has been prevented from flowering by excessive exposure to light, this latter plant will also produce flower buds. Which is the best inference from this result?

Options:
A Hormones can transmit information to all parts of plants
B Leaves are more sensitive to the photoperiodic stimulus than other parts of the plant
C The photoperiodic stimulus is received by the leaves and transmitted by a hormone.
D The photoperiodic stimulus is received by all parts of the shoot and transmitted by a hormone.

The correct answer is:
The photoperiodic stimulus is received by the leaves and transmitted by a hormone.

Solution:
Auxin hormone is responsible for photoperiodism.
The photoperiodic stimulus is received by the leaves and transmitted by auxin hormone.

Topic: Biology, Plant - Growth and Development, NEET
When aluminium oxide (Al2O3) is electrolysed for the production of aluminium metal. For a given quantity of electricity, if the volume of O2 gas obtained is 201.6 litre measured at NTP the number of moles of aluminium obtained

Options:
A 3
B 9
C 12
D 6

The correct answer is:
12

Solution:
â equivalents at anode = equivalents at cathode
â equivalents of oxygen = equivalents of aluminium
Number of equivalents of oxygen =201.65.6=36
(Equivalent volume of oxygen = 5.6 litre at NTP)
So number of equivalents of Al = 36
Mass of aluminium =36Ã9 g
Number of moles of aluminium =weight atomic weight=36Ã927=12 .

Topic: Chemistry, Some Basic Concepts of Chemistry, NEET
When amines react with carboxylic acids at room temperature, what type of compounds are typically formed?

Options:
A Aldehydes
B Alcohols
C Amides
D Ethers

The correct answer is:
Amides

Solution:
Amines react with carboxylic acids to form amides at room temperature

Topic: Chemistry, Amines, NEET
When an alkali metal dissolves in liquid ammonia, the solution can acquire different colours. What is the reason for this type of colour change?

Options:
A The alkali metal undergoes a chemical reaction with ammonia, leading to the color change.
B The solvated electrons formed during the process absorb energy in the visible region, producing characteristic colors.
C The ammonia molecules undergo a change in their electronic configuration, resulting in color variations.
D The color change is due to the formation of new chemical compounds between the alkali metal and ammonia.

The correct answer is:
The solvated electrons formed during the process absorb energy in the visible region, producing characteristic colors.

Solution:
Correct Option is : (B)
The solvated electrons formed during the process absorb energy in the visible region, producing characteristic colors.

Topic: Chemistry, s Block Elements, NEET
When an alkene reacts with water in the presence of concentrated sulfuric acid, which carbon of the double bond does the hydrogen atom from water typically attach to?

Options:
A The less substituted carbon
B The more substituted carbon
C The terminal carbon
D Both carbons equally

The correct answer is:
The more substituted carbon

Solution:
According to Markovnikov's Rule, the hydrogen atom from water typically attaches to the more substituted carbon of the double bond.

Topic: Chemistry, Hydrocarbons, NEET
When an electric discharge is passed through hydrogen gas, the hydrogen molecules dissociate to produce excited hydrogen atoms. These excited atoms emit electromagnetic radiation of discrete frequencies which can be given by the general formula
What points of Bohr’s model of an atom can be used to arrive at this formula?

Options:
A Bohr's model considers electrons as particles revolving in fixed orbits around the nucleus. The formula represents the transitions of electrons between energy levels in these orbits.
B Bohr's model introduces the concept of quantized energy levels for electrons in the atom. The formula relates the energy difference between these levels to the frequency of emitted radiation.
C Bohr's model postulates that electrons emit or absorb energy only in discrete amounts when they jump from one orbit to another. The formula describes the wavelengths corresponding to these transitions.
D Bohr's model asserts that the angular momentum of an electron in an orbit is quantized and can only take on certain values. The formula incorporates the relationship between angular momentum and energy levels.

The correct answer is:
Bohr's model postulates that electrons emit or absorb energy only in discrete amounts when they jump from one orbit to another. The formula describes the wavelengths corresponding to these transitions.

Solution:
Correct Option is : (C)
Bohr's model postulates that electrons emit or absorb energy only in discrete amounts when they jump from one orbit to another. The formula describes the wavelengths corresponding to these transitions.

Topic: Chemistry, Structure of Atom, NEET
When an electron falls from a higher energy to a lower energy level, the difference in the energies appears in the form of electromagnetic radiation. Why cannot it be emitted as other forms of energy?

Options:
A Because electrons are not capable of releasing other forms of energy.
B Because the energy difference can only be released as electromagnetic radiation.
C Because other forms of energy are not produced during the transition of electron energy levels.
D Because electrons interact only electromagnetically.

The correct answer is:
Because electrons interact only electromagnetically.

Solution:
Correct Option is : (D)
Because electrons interact only electromagnetically.

Topic: Chemistry, Atomic Physics, NEET
When an electron jumps from a level n=4 to n=1, the momentum of the recoiled hydrogen atom will be

Options:
A 6.8Ã10-27 kg-m s-1
B 12.75Ã10-19 kg-m s-1
C 136Ã10-19 kg-m s-1
D Zero

The correct answer is:
6.8Ã10-27 kg-m s-1

Solution:
E=E4-E1=-13.642â-13.612
=-0.85+13.6=12.75 eV
=12.75Ã1.6Ã10-19 J
P=Ec=12.75Ã1.6Ã10-193Ã108
=6.8Ã10-27 kg-m s-1
This must be the momentum of recoiled hydrogen atom (in opposite direction)

Topic: Physics, Atomic Physics, NEET
When an electron jumps from higher orbit to the second orbit in He+ ion, the radiation emitted out will be in R=1.09Ã107 m-1

Options:
A Ultraviolet region
B Visible region
C Infrared region
D X-ray region

The correct answer is:
Visible region

Solution:
1λ=RZ21n12-1n22
For λmax′ n1=2 then n2=3
∴ 1λmax=1.09×107×22 122-132
∴ λmax=165 nm (The region is visible)

Topic: Physics, Atomic Physics, NEET
When an electron of a hydrogen atom jumps from n=4 to n=1 state, the number of spectral lines emitted are

Options:
A 9
B 3
C 6
D 15

The correct answer is:
6

Solution:
The number of lines in the spectrum =(n2-n1)(n2-n1+1)2
Here, n2=4,n1=1
So (N) =(4-1)(4-1+1)2=3×42=6

Topic: Chemistry, Structure of Atom, NEET
When an electron of charge, e and mass, m moves with velocity v around the nuclear charge 'Ze' describing the circular orbit, the potential energy of the electron is

Options:
A Ze2/r
B − Ze 2 /r
C Ze2/r2
D mv2/r

The correct answer is:
− Ze 2 /r

Solution:
Potential energy of electron is
(+Ze)(-e)r=-Ze2r

Topic: Chemistry, Structure of Atom, NEET
When an electron revolves around the nucleus, then the ratio of magnetic moment to angular momentum is

Options:
A e2m
B 2em
C em
D em2

The correct answer is:
e2m

Solution:
Angular momentum : L=nh2π=mvr
Magnetic moment : μ=iA=e2πrv×πr2

μ=e(vr)2
μ=e2Lm
Ratio of magnetic moment to angular momentum
μL=e2m

Topic: Physics, Atomic Physics, NEET
When an iceberg floats in water with a part of it submerged, what is the fraction of the volume of the iceberg submerged if the density of ice is ρi= 0.917 g cm–3?

Options:
A 0.917
B 0.5
C 0.25
D 0.75

The correct answer is:
0.917

Solution:
Correct Option is : (A)
0.917

Topic: Chemistry, Mechanical Properties of Fluids, NEET
When an ideal binary solution is in equilibrium with its vapour, molar ratio of the two components in the solution and in the vapour phase is

Options:
A same
B different
C may or may not be same depending upon volatile nature of the two components
D none of these

The correct answer is:
may or may not be same depending upon volatile nature of the two components

Solution:
When an ideal binary solution is in equilibrium with its vapour, molar ratio of the two components in the solution and in the vapour phase may or may not be same depending upon volatile nature of the two components.
Recall that PA'=PMÃXA(in vapour phase)=P0ÃXA(in liquid phase) .

Topic: Chemistry, Solutions, NEET
When an ideal diatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the internal energy of the gas, is

Options:
A 25
B 35
C 37
D 57

The correct answer is:
57

Solution:
∆U=nCv∆T, ∆Qp=nCp ∆T
ΔUΔQp=CvCp=1γ=57

Topic: Physics, Thermal Properties of Matter, NEET
When an ideal gas with pressure P and volume V is compressed isothermally to one-fourth of its volume, the pressure is P1. When the same gas is compressed polytropically according to the equation PV1.5 = constant to one-fourth of its initial volume, the pressure is P2. The ratio P1P2 is

Options:
A 1 2
B 1 2 1.5
C 2
D 21.5

The correct answer is:
1 2

Solution:
For the isothermal process :PV = constant
orPV=P1V4⇒P1=4P
For the polytropic process : PV1.5=constant
PV1.5=P2V41.5⇒P2=223/2P=8P
∴ P1P2=12

Topic: Physics, Thermodynamics, NEET
When an object is at distance x and y from a lens, a real image and a virtual image are formed respectively having the same magnification. The focal length of the lens is

Options:
A x+y2
B x – y
C xy
D x + y

The correct answer is:
x+y2

Solution:
The given lens is a convex lens. Let the magnification be m, then for real image using lens formula
1mx+1x=1f .......(i)
And for virtual image
1-my+1y=1f ........(ii)
From equation (i) and equation (ii),
we get f=x+y2

Topic: Physics, Ray Optics, NEET
When an object is placed at a distance of 25 cm from a mirror, the magnification is m1. But the magnification becomes m2, when the object is moved 15 cm farther away with respect to the earlier position. m1m2=4, then find the focal length of the mirror and what type of mirror it is?

Options:
A 20 cm, convex

B 20 cm, concave

C 10 cm, convex

D 10 cm, concave

The correct answer is:
20 cm, concave

Solution:
m=-vu=ff-u
so,m1=ff--25=ff+25
Similarly,m2=ff+40
andm1m2=4
∴f+40f+25=4
f=- 20 cm

negative sign shows that the mirror is concave.

Topic: Physics, Ray Optics, NEET
When an object is shot from the bottom of a long smooth inclined plane kept at an angle 60° with horizontal, it can travel a distance x1 along the plane. But, when the inclination is decreased to 30° and the same object is shot with the same velocity, it can travel x2 distance. Then x1:x2 will be

Options:
A 1:⁡2
B 2:⁡1
C 1:⁡3
D 1:⁡23

The correct answer is:
1:⁡3

Solution:
The equation of motion in exclusive
v2=2gsin60°x1 …(1)
v2=2gsin30°x2
Equating,
2gsin60°x1=2gsin30°x2
x1:x2=1:3

Topic: Physics, Motion In Two Dimensions, NEET, NEET 2019 (All India)
When an on/off switch S is thrown from the off position (open circuit) to the on position (closed circuit) surrounding a magnet, will a current flow in the circuit? Explain why.

Options:
A Yes, because the magnet generates an electric field.
B No, because the wire is not moving.
C Yes, because of the magnetic field produced by the magnet.
D No, because no electromotive force is produced due to the stationary magnet and the wire's motionlessness.

The correct answer is:
No, because no electromotive force is produced due to the stationary magnet and the wire's motionlessness.

Solution:
Correct Option is : (D)
No, because no electromotive force is produced due to the stationary magnet and the wire's motionlessness.

Topic: Chemistry, Electromagnetic Induction, NEET
When an orange solution containing Cr2O72–ion is treated with an alkali, a yellow solution is formed, and when H+ions are added to the yellow solution, an orange solution is obtained. Explain why does this happen?

Options:
A Cr2O72–ion undergoes redox reactions with both alkali and acid.
B The pH of the solution affects the equilibrium between Cr2O72–and CrO42–ions.
C The addition of H+ions shifts the equilibrium towards theCr2O72–ion.
D The alkali changes the coordination number of chromium.

The correct answer is:
The pH of the solution affects the equilibrium between Cr2O72–and CrO42–ions.

Solution:
Correct Option is : (B)
The pH of the solution affects the equilibrium between Cr2O72–and CrO42–ions.

Topic: Chemistry, d and f Block Elements, NEET
When an oxide of manganese (A) is fused with KOH in the presence of an oxidizing agent and dissolved in water, it gives a dark green solution of compound (B). Compound (B) disproportionates in neutral or acidic solution to give purple compound (C). An alkaline solution of compound (C) oxidizes potassium iodide solution to a compound (D) and compound (A) is also formed. Identify compounds A to D and also explain the reactions involved.

Options:
A A Mn2O7, B Potassium permanganate (KMnO4), C Manganate ion (MnO42-), D Manganese dioxide (MnO2)
B A Manganese(IV) oxide (MnO2), B (K2MnO4), C (KMnO4), D (KIO3)
C A Manganese(III) oxide (Mn2O3), B Potassium permanganate (KMnO4), C Permanganate ion (MnO4-), D Manganese dioxide (MnO2)
D A Manganese(II) oxide (MnO), B Potassium permanganate (KMnO4), C Permanganate ion (MnO4-), D Manganese dioxide (MnO2)

The correct answer is:
A Manganese(IV) oxide (MnO2), B (K2MnO4), C (KMnO4), D (KIO3)

Solution:
Correct Option is : (B)
A Manganese(IV) oxide (MnO2), B (K2MnO4), C (KMnO4), D (KIO3)

Topic: Chemistry, d and f Block Elements, NEET
When an α -particle of mass m moving with a undefined velocity bombards on a heavy nucleus of charge Ze, its distance of the closest approach from the nucleus depends on m as:

Options:
A 1 m
B 1 m
C 1m2
D m

The correct answer is:
1 m

Solution:
At the distance of the lowest approach, total K.E. of α-particle changes to P.E. So,
12mv2=KQ.qr=KZe2er
r=4K Ze2mv2⇒r∝1m
r∝1m

Topic: Physics, Nuclear Physics, NEET, NEET 2016 (Phase 1)
When aniline is treated with bromine-water, it forms

Options:
A 2-bromoaniline
B 4-bromoaniline
C mixture of 2 and 4-bromoaniline
D 2,4,6-tribromoaniline

The correct answer is:
2,4,6-tribromoaniline

Solution:
-NH2 groups activates the ring strongly, therefore, Br+ attack the benzene ring at 2, 4, 6 positions simultaneously.

Topic: Chemistry, Amines, NEET
When aniline is treated with fuming sulphuric acid at 475 K, it gives

Options:
A sulphanilic acid
B aniline sulphate
C o-aminobenzenesulphonic acid
D m-aminobenzenesulphonic acid

The correct answer is:
sulphanilic acid

Solution:

Topic: Chemistry, Amines, NEET
When aniline is treated with sodium nitrite and hydrochloric acid at 0℃, it gives

Options:
A Phenol and N2
B Diazonium salt
C Hydrazo compound
D No reaction takes place

The correct answer is:
Diazonium salt

Solution:
It gives diazonium salt.
It is known as diazotization reaction.

Topic: Chemistry, Amines, NEET
When any plane passing through the central axis of the body divides the organism into two identical halves, then this is called

Options:
A Radial symmetry
B Bilateral symmetry
C Central symmetry
D Axial symmetry

The correct answer is:
Radial symmetry

Solution:
When any plane passing through the central axis of the body divides the organism into two identical halves, then this is called radial symmetry. It is shown by echinoderms, coelenterates and ctenophores.

Topic: Biology, Animal Kingdom, NEET
When aqueous NaOH is added to an aqueous solution of chromium (III) ions, a green blue precipitate is first formed which re-dissolves to give a green solution. The green colour is due to

Options:
A Cr H 2 O 6 3 +
B Cr OH 4 -
C CrO 4 2 -
D Cr OH 3 H 2 O 3

The correct answer is:
Cr OH 4 -

Solution:
When aqueous solution of NaOH is added to aqueous solution of Cr (III) ion it produces [Cr(H2O)3(OH)3]
Cr H 2 O 6 3 + + NaOH → Cr OH 3 H 2 O 3 + H 2 O Light green ppt.
Which further redissolves in aq. NaOH (in excess) to produce dark green solution due to formation of Cr OH 4 -
Cr OH 3 H 2 O 3 + OH ⊖ → Cr OH 4 - Excess Dark green solution

Topic: Chemistry, Coordination Compounds, NEET