datavorous/entrance-exam-dataset huggingface dataset:
Which of the following options correctly explains the Coordination Number?

Options:
A The coordination number of a metal ion in a complex can be defined as the number of total ligand donor atoms to which the metal is directly bonded.
B Coordination number indicates the number of ligands bonded to each other in a coordination compound.
C Coordination number denotes the total number of central metal ions in a coordination compound..
D Coordination number represents the charge on the central metal ion.

The correct answer is:
The coordination number of a metal ion in a complex can be defined as the number of total ligand donor atoms to which the metal is directly bonded.

Solution:
Correct Option is : (A)
The coordination number of a metal ion in a complex can be defined as the number of total ligand donor atoms to which the metal is directly bonded.

Topic: Chemistry, Coordination Compounds, NEET
Which of the following options correctly explains the difference between heteroleptic and homoleptic complexes with examples?

Options:
A Heteroleptic complexes contain only one type of ligand, while homoleptic complexes contain a variety of different ligands. An example of a heteroleptic complex is [Pt(NH3)2Cl2], while [Ni(CO)4] is a homoleptic complex.
B Heteroleptic complexes contain a mixture of different metal ions, while homoleptic complexes contain only one type of metal ion. An example of a heteroleptic complex is [Fe(CN)6]3−, while [Fe(NH3)6]2+is a homoleptic complex.
C Heteroleptic complexes contain different types of ligands bonded to the central metal ion, while homoleptic complexes have only one type of ligand bonded to the metal ion. An example of a heteroleptic complex is [Co(NH3)4Cl2]Cl, while [Ni(CO)4] is a homoleptic complex.
D Heteroleptic complexes have a coordination number of 4, while homoleptic complexes have a coordination number of 6. An example of a heteroleptic complex is [Pt(NH3)4Cl2], while [Ni(CO)4] is a homoleptic complex.

The correct answer is:
Heteroleptic complexes contain different types of ligands bonded to the central metal ion, while homoleptic complexes have only one type of ligand bonded to the metal ion. An example of a heteroleptic complex is [Co(NH3)4Cl2]Cl, while [Ni(CO)4] is a homoleptic complex.

Solution:
Correct Option is : (C)
Heteroleptic complexes contain different types of ligands bonded to the central metal ion, while homoleptic complexes have only one type of ligand bonded to the metal ion. An example of a heteroleptic complex is [Co(NH3)4Cl2]Cl, while [Ni(CO)4] is a homoleptic complex.

Topic: Chemistry, Coordination Compounds, NEET
Which of the following options correctly explains the difference between unidentate and bidentate ligands with examples?

Options:
A Unidentate ligands can bond to a central metal ion through two donor atoms, while bidentate ligands bond through only one donor atom. An example of an unidentate ligand is NH3, and an example of a bidentate ligand is ethylenediamine (en).
B Unidentate ligands bond to a central metal ion through a single donor atom, while bidentate ligands bond through two donor atoms. An example of an unidentate ligand is H2O, and an example of a bidentate ligand is CO.
C Unidentate ligands have a charge of +1, while bidentate ligands have a charge of +2. An example of an unidentate ligand is Cl−, and an example of a bidentate ligand is NO2−.
D Unidentate ligands can form only monodentate coordination complexes, while bidentate ligands can form both mono- and bidentate coordination complexes. An example of an unidentate ligand is OH−, and an example of a bidentate ligand is SCN−.

The correct answer is:
Unidentate ligands bond to a central metal ion through a single donor atom, while bidentate ligands bond through two donor atoms. An example of an unidentate ligand is H2O, and an example of a bidentate ligand is CO.

Solution:
Correct Option is : (B)
Unidentate ligands bond to a central metal ion through a single donor atom, while bidentate ligands bond through two donor atoms. An example of an unidentate ligand is H2O, and an example of a bidentate ligand is CO.

Topic: Chemistry, Coordination Compounds, NEET
Which of the following options correctly represents the location of the image when a 4.5 cm needle is placed 12 cm away from a convex mirror with a focal length of 15 cm?

Options:
A 6.7 cm
B 8.3 cm
C 3.5 cm
D 11.2 cm

The correct answer is:
6.7 cm

Solution:
Correct Option is : (A)
6.7 cm

Topic: Chemistry, Ray Optics, NEET
Which of the following options correctly represents the properties of queen, drone and worker in a beehive?

Options:
A Queen- diploid fertile female, Drone- haploid fertile male, Worker- diploid sterile female
B Queen- haploid fertile female, Drone- haploid fertile male, Worker- diploid sterile female
C Queen- diploid sterile female, Drone- haploid sterile male, Worker- diploid fertile female
D Queen- haploid fertile female, Drone- haploid fertile male, Worker- haploid sterile female

The correct answer is:
Queen- diploid fertile female, Drone- haploid fertile male, Worker- diploid sterile female

Solution:
Honey bees show the haplodiploid method of sex determination. The queen bee is diploid females with 32 chromosomes. She produces haploid eggs by mitosis. Drones are haploid males with 16 chromosomes. They produce haploid sperms by mitosis. The eggs are fertilized to form worker bees which are diploid sterile females, whereas unfertilized eggs parthenogenetically from haploid fertile drones.

Topic: Biology, Principles of Inheritance and Variation, NEET
Which of the following options correctly represents the ratio of the mean free paths of two gases, each having molecular diameters of 1A and 2A, respectively, under identical conditions of temperature, pressure, and volume?

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

The correct answer is:
4:1

Solution:
Correct Option is : (B)
4:1

Topic: Chemistry, Kinetic Theory of Gases, NEET
Which of the following options correctly represents the reactions occurring in different zones of the blast furnace during the extraction of iron?

Options:
A Zone 1: Reduction of iron ore to iron, Zone 2: Formation of slag, Zone 3: Combustion of coke.
B Zone 1: Formation of slag, Zone 2: Combustion of coke, Zone 3: Reduction of iron ore to iron.
C Zone 1: Combustion of coke, Zone 2: Formation of slag, Zone 3: Reduction of iron ore to iron.
D Zone 1: Reduction of iron ore to iron, Zone 2: Combustion of coke, Zone 3: Formation of slag.

The correct answer is:
Zone 1: Reduction of iron ore to iron, Zone 2: Combustion of coke, Zone 3: Formation of slag.

Solution:
Correct Option is : (D)
Zone 1: Reduction of iron ore to iron, Zone 2: Combustion of coke, Zone 3: Formation of slag.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
Which of the following options correctly represents the work function of the metal in electronvolts (eV), given that the maximum energy of the electron doubles when light of wavelength 400 nm is used, initially with light of wavelength 600 nm?

Options:
A 0.51 eV
B 1.02 eV
C 1.50 eV
D 2.04 eV

The correct answer is:
1.02 eV

Solution:
Correct Option is : (B)
1.02 eV

Topic: Chemistry, Dual Nature of Matter, NEET
Which of the following options correctly states the maximum speed of the emitted photoelectrons when light of frequency 6 × 1014Hz is incident on the metal surface with a work function of 2.14 eV?

Options:
A 344 km/s
B 280 km/s
C 412 km/s
D 520 km/s

The correct answer is:
344 km/s

Solution:
Correct Option is : (A)
344 km/s

Topic: Chemistry, Dual Nature of Matter, NEET
Which of the following options describes the Reimer-Tiemann reaction correctly?

Options:
A The Reimer-Tiemann reaction involves the conversion of alcohols into alkyl halides using chlorine and a strong base.
B When phenol is treated with chloroform in the presence of sodium hydroxide, a −CHO group is introduced at the ortho position of the benzene ring. This reaction is known as the Reimer-Tiemann reaction.
C The Reimer-Tiemann reaction converts alkyl halides into alkenes using alcoholic KOH as the reagent.
D The Reimer-Tiemann reaction is a method for the direct conversion of alkanes into alkenes using high temperatures and pressure.

The correct answer is:
When phenol is treated with chloroform in the presence of sodium hydroxide, a −CHO group is introduced at the ortho position of the benzene ring. This reaction is known as the Reimer-Tiemann reaction.

Solution:
Correct Option is : (B)
When phenol is treated with chloroform in the presence of sodium hydroxide, a −CHO group is introduced at the ortho position of the benzene ring. This reaction is known as the Reimer-Tiemann reaction.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following options describes the structure of the common form of ice correctly?

Options:
A Ice consists of individual water molecules held together by covalent bonds.
B Ice has a three-dimensional network structure with each water molecule forming four hydrogen bonds with neighbouring molecules in a hexagonal lattice.
C Ice has a linear chain-like structure with water molecules linked by hydrogen bonds.
D Ice has a random and disordered structure with water molecules arranged haphazardly.

The correct answer is:
Ice has a three-dimensional network structure with each water molecule forming four hydrogen bonds with neighbouring molecules in a hexagonal lattice.

Solution:
Correct Option is : (B)
Ice has a three-dimensional network structure with each water molecule forming four hydrogen bonds with neighbouring molecules in a hexagonal lattice.

Topic: Chemistry, Hydrogen, NEET
Which of the following options does correctly represent the characteristic features of phylum Annelida?

Options:
A Triploblastic, unsegmented body and bilaterally symmetrical
B Triploblastic, segmented body and bilaterally symmetrical
C Triploblastic, flattened body and acoelomate condition
D Diploblastic, mostly marine and radially symmetrical

The correct answer is:
Triploblastic, segmented body and bilaterally symmetrical

Solution:
In Annelids, it is divided into a number of segments or metameres. The successive segments of the body are separated externally by ring-like constrictions called annuli. They are eucoelomates.

The body is made up of three layers, it is triploblastic.

The body of annelids can be divided into two equal halves by a single plane of symmetry, and thus are bilaterally symmetrical.

Topic: Biology, Animal Kingdom, NEET, NEET 2020 (Phase 2)
Which of the following options does not affect the rate of a chemical reaction?

Options:
A Temperature
B Concentration of reactants
C Presence of a catalyst
D Phase of reactants

The correct answer is:
Phase of reactants

Solution:
Correct Option is : (D)
Phase of reactants

Topic: Chemistry, Chemical Kinetics, NEET
Which of the following options explain on the basis of valence bond theory why [Ni(CN)4]2–ion with square planar structure is diamagnetic but the [NiCl4]2–ion with tetrahedral geometry is paramagnetic?

Options:
A The square planar arrangement leads to stronger ligand-metal bonding, resulting in diamagnetism.
B In [Ni(CN)4]2–ion ,3d electrons get paired because CN is a strong ligand but in case of [NiCl4]2–,3d electrons don't get paired as Cl is a weak ligand
C The tetrahedral geometry causes weaker ligand-metal bonding, resulting in paramagnetism.
D The oxidation state of Ni in [Ni(CN)4]2–is different from [NiCl4]2–, affecting their magnetic behaviour.

The correct answer is:
In [Ni(CN)4]2–ion ,3d electrons get paired because CN is a strong ligand but in case of [NiCl4]2–,3d electrons don't get paired as Cl is a weak ligand

Solution:
Correct Option is : (B)
In [Ni(CN)4]2–ion ,3d electrons get paired because CN is a strong ligand but in case of [NiCl4]2–,3d electrons don't get paired as Cl is a weak ligand

Topic: Chemistry, Coordination Compounds, NEET
Which of the following options explain the chelate effect with an example?

Options:
A The chelate effect refers to the increased stability and enhanced colouration observed in metal complexes when multidentate ligands (chelating ligands) form multiple bonds with the central metal ion. An example is the formation of [Ni[EDTA]]2-
B The chelate effect is the tendency of metal complexes to become less stable when chelating ligands are involved. An example is the destabilisation of metal complexes by multidentate ligands.
C The chelate effect is a phenomenon where metal ions become completely unreactive in the presence of chelating ligands. An example is the formation of unreactive metal-chelate complexes.
D The chelate effect is the change in colour of metal complexes when they react with chelating ligands. An example is the colour change in copper complexes upon chelation.

The correct answer is:
The chelate effect refers to the increased stability and enhanced colouration observed in metal complexes when multidentate ligands (chelating ligands) form multiple bonds with the central metal ion. An example is the formation of [Ni[EDTA]]2-

Solution:
Correct Option is : (A)
The chelate effect refers to the increased stability and enhanced colouration observed in metal complexes when multidentate ligands (chelating ligands) form multiple bonds with the central metal ion. An example is the formation of [Ni[EDTA]]2-

Topic: Chemistry, Coordination Compounds, NEET
Which of the following options explain the term copolymerisation correctly?

Options:
A Copolymerization refers to the process of combining two different materials to create a new material.
B Copolymerization is the synthesis of polymers from a single type of monomer.
C Copolymerization involves the mixing of polymers and monomers to form a composite material.
D Copolymerization is the polymerization of two or more different monomers to create a polymer with varying repeating units

The correct answer is:
Copolymerization is the polymerization of two or more different monomers to create a polymer with varying repeating units

Solution:
Correct Option is : (D)
Copolymerization is the polymerization of two or more different monomers to create a polymer with varying repeating units

Topic: Chemistry, Polymers, NEET
Which of the following options explain why cations are smaller and anions larger in radii than their parent atoms?

Options:
A Cations have fewer protons, resulting in a smaller effective nuclear charge, while anions have more protons, leading to a larger effective nuclear charge.
B Cations have gained electrons, resulting in a smaller electron cloud, while anions have lost electrons, leading to a larger electron cloud.
C Cations have lost electrons, resulting in a smaller electron cloud, while anions have gained electrons, leading to a larger electron cloud.
D Cations and anions have the same number of electrons, but cations have a smaller number of protons in the nucleus.

The correct answer is:
Cations have lost electrons, resulting in a smaller electron cloud, while anions have gained electrons, leading to a larger electron cloud.

Solution:
Correct Option is : (C)
Cations have lost electrons, resulting in a smaller electron cloud, while anions have gained electrons, leading to a larger electron cloud.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which of the following options explain why [Co(NH3)5Cl]SO4and [Co(NH3)5(SO4)]Cl are ionisation isomers?

Options:
A They dissolve in water to yield different ions and thus react differently to various reagents
B They have the same coordination structure but different molecular formulas.
C They are not ionisation isomers.
D They have the same molecular formula and the same coordination structure.

The correct answer is:
They dissolve in water to yield different ions and thus react differently to various reagents

Solution:
Correct Option is : (A)
They dissolve in water to yield different ions and thus react differently to various reagents

Topic: Chemistry, Coordination Compounds, NEET
Which of the following options explains [Fe(H2O)6]3+is strongly paramagnetic whereas [Fe(CN)6]3–is weakly paramagnetic?

Options:
A Both [Fe(H2O)6]3+and [Fe(CN)6]3–have the same degree of paramagnetism, so there is no difference in their paramagnetic behaviour.
B [Fe(H2O)6]3+has a higher oxidation state, resulting in stronger paramagnetism compared to [Fe(CN)6]3–.
C In the case of [Fe(CN)6]3–, CN-leads to an inner orbital complex with one unpaired electron, but for [Fe(H2O)6]3+,H2O leads to form an outer orbital complex with five unpaired electrons.
D [Fe(H2O)6]3+has a lower coordination number, leading to stronger paramagnetism compared to [Fe(CN)6]3–.

The correct answer is:
In the case of [Fe(CN)6]3–, CN-leads to an inner orbital complex with one unpaired electron, but for [Fe(H2O)6]3+,H2O leads to form an outer orbital complex with five unpaired electrons.

Solution:
Correct Option is : (C)
In the case of [Fe(CN)6]3–, CN-leads to an inner orbital complex with one unpaired electron, but for [Fe(H2O)6]3+,H2O leads to form an outer orbital complex with five unpaired electrons.

Topic: Chemistry, Coordination Compounds, NEET
Which of the following options explains the splitting of d orbitals in an octahedral crystal field?

Options:
A In octahedral symmetry the d-orbitals split into two sets with an energy difference, where the dxy,​dyz,​dzxorbitals will be lower in energy than the dz2,dx2−y2, which will have higher energy
B The octahedral crystal field causes d orbitals to split into three equal energy levels, resulting in a simplified electron configuration.
C The octahedral crystal field splitting is solely determined by the oxidation state of the central metal ion and is not influenced by ligand interactions.
D The octahedral crystal field causes d orbitals to merge into a single energy level due to the symmetry of the ligand arrangement.

The correct answer is:
In octahedral symmetry the d-orbitals split into two sets with an energy difference, where the dxy,​dyz,​dzxorbitals will be lower in energy than the dz2,dx2−y2, which will have higher energy

Solution:
Correct Option is : (A)
In octahedral symmetry the d-orbitals split into two sets with an energy difference, where the dxy,​dyz,​dzxorbitals will be lower in energy than the dz2,dx2−y2, which will have higher energy

Topic: Chemistry, Coordination Compounds, NEET
Which of the following options explains why [Co(NH3)6]3+is an inner orbital complex whereas [Ni(NH3)6]2+is an outer orbital complex?

Options:
A Co+3has d7configuration i.e. leads to d2sp3hybridisation/inner orbital complex but on the other hand, Ni+2has a d8configuration which leads to sp3d2hybridisation/outer orbital complex.
B [Co(NH3)6]3+has a higher oxidation state than [Ni(NH3)6]2+, leading to inner orbital complex formation.
C [Co(NH3)6]3+has a higher coordination number, resulting in inner orbital complex formation, whereas [Ni(NH3)6]2+has a lower coordination number, forming an outer orbital complex.
D The presence of ammonia ligands in [Co(NH3)6]3+promotes inner orbital complex formation, while [Ni(NH3)6]2+prefers outer orbital complex formation due to the ligand's weaker field.

The correct answer is:
Co+3has d7configuration i.e. leads to d2sp3hybridisation/inner orbital complex but on the other hand, Ni+2has a d8configuration which leads to sp3d2hybridisation/outer orbital complex.

Solution:
Correct Option is : (A)
Co+3has d7configuration i.e. leads to d2sp3hybridisation/inner orbital complex but on the other hand, Ni+2has a d8configuration which leads to sp3d2hybridisation/outer orbital complex.

Topic: Chemistry, Coordination Compounds, NEET
Which of the following options gives the correct sequence of events during mitosis?

Options:
A codensation → nuclear membrane disassembly → crossing over → segregation → telophase
B condensation → nuclear membrane disassembly → arrangement at equator → centromere division → segregation → telophase
C condensation → crossing over → nuclear membrane disassembly → segregation → telophase
D condensation → arrangement at equator → centromere division → segregation → telophase

The correct answer is:
condensation → nuclear membrane disassembly → arrangement at equator → centromere division → segregation → telophase

Solution:
The correct sequence of events during mitosis would be as follows
(i) Condensation of DNA so that chromosomes become visible occurs during early to mid-prophase.
(ii) Nuclear membrane disassembly begins at late prophase or transition to metaphase.
(iii) An arrangement of chromosomes at equator occurs during metaphase, called congression.
(iv) Centromere division or splitting occurs during anaphase forming daughter chromosomes.
(v) Segregation also occurs during anaphase as daughter chromosomes separate and move to opposite poles.
(vi) Telophase leads to the formation of two daughter nuclei.

Topic: Biology, Cell Cycle and Cell Division, NEET, NEET 2017
Which of the following options has an odd pair?

Options:
A Sting of honey bee and scorpion
B Wing of an insect and bat
C Stipules of Lathyrus and petiole of Acacia
D Forelimbs of frog and human

The correct answer is:
Forelimbs of frog and human

Solution:
Certain anatomical and morphological similarities seen in animals of today and those that existed years ago. By interpreting these similarities, one can understand whether common ancestors were shared or not. The sting of honey bee and scorpion are structurally different but functionally similar. Similarly, the wing of an insect and bat are structurally different but perform the same function of flying and also Stipules of Lathyrus and petiole of Acacia are structurally different but functionally similar. Organs that are structurally different but similar in function are analogous organs. As opposed to organs that are structurally similar but different in function are called homologous organs. The forelimbs of frog and humans are structurally the same but perform different functions hence they are homologous organs.

Topic: Biology, Evolution, NEET
Which of the following options has examples of viviparous animals only?

Options:
A Lizard, Turtle
B Platypus, Crocodile
C Cow, Crocodile
D Whale, Mouse

The correct answer is:
Whale, Mouse

Solution:
In viviparous animals, females give birth to young ones. The development of zygote takes place inside the female's body. Females deliver young ones and the chances of survival of offsprings are more.

Topic: Biology, Animal Kingdom, NEET
Which of the following options is correct about bond lengths?

Options:
A C=C < C=N
B C=C > C=N
C C=C = C=N
D None of the above

The correct answer is:
None of the above

Solution:
Correct Option is : 4
None of the above

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following options is correct about the ionic radii of lanthanoids?

Options:
A Ce3+4+
B Ce3+3+
C Pr3+4+
D Pm3+3+

The correct answer is:
Pm3+3+

Solution:
Correct Option is : 4
Pm3+3+

Topic: Chemistry, d and f Block Elements, NEET
Which of the following options is correct for the object having a straight line motion represented by the following graph?

Options:
A The object moves with constantly increasing velocity from O to A and then it moves with constant velocity.
B Velocity of the object increases uniformly
C Average velocity is zero
D The graph shown is impossible

The correct answer is:
Average velocity is zero

Solution:
Average velocity is defined as the displacement divided by time.
In the given graph, displacement is zero.
Hence, Average velocity=total displacement total time=0t=0

Topic: Physics, Motion In One Dimension, NEET
Which of the following options is correct order of Enthalpy of formation of H2O and D2O?

Options:
A H2O=D2O
B H2O>D2O
C H2O2O
D None of the above

The correct answer is:
H2O>D2O

Solution:
Correct Option is : 2
H2O>D2O

Topic: Chemistry, Hydrogen, NEET