datavorous/entrance-exam-dataset huggingface dataset:
Which of the following statements is not correct about the electronic configuration of gaseous chromium atom

Options:
A It has 5 electrons in 3d and one electron in 4s orbitals
B The principal quantum numbers of its valence electrons are 3 and 4
C It has 6 electrons in 3d orbital
D Its valance electrons have quantum number l=0

The correct answer is:
It has 6 electrons in 3d orbital

Solution:
Chromium has atomic number of 24 , its electronic configuration is 1s22s22p63s23d54s1

Topic: Chemistry, d and f Block Elements, NEET
Which of the following statements is not correct for a nucleophile?

Options:
A Nucleophile is a Lewis acid
B Ammonia is a nucleophile
C Nucleophiles attack low e- density sites
D Nucleophiles are not electron seeking

The correct answer is:
Nucleophile is a Lewis acid

Solution:
Reason: Nucleophiles are electron rich species so act as Lewis base.

Topic: Chemistry, General Organic Chemistry, NEET, NEET 2015 (Phase 2)
Which of the following statements is not correct for the vacuoles?

Options:
A Contractile vacuoles are helpful in excretion
B Usually tonoplast facilitates the transport of ions against the concentration gradient into the cytoplasm
C Food vacuoles are formed by engulfing the food particles
D Sap vacuole is bound by a single membrane

The correct answer is:
Usually tonoplast facilitates the transport of ions against the concentration gradient into the cytoplasm

Solution:
The three major components of the tonoplast are two proton pumps, the vacuolar H+-ATPase facilitates transportation in the vacuole.

Topic: Biology, Cell - The Unit of Life, NEET
Which of the following statements is not correct regarding diamond and graphite?

Options:
A In diamond, each carbon atom is covalently bonded to four other carbon atoms
B In graphite, each carbon atim is covalently bonded to three other carbon atoms in the same plane
C The C-C bond length in graphite is intermediate between single and double bond distance
D Diamond is a layered structure, the two layers joined by Van der Waals' forces

The correct answer is:
Diamond is a layered structure, the two layers joined by Van der Waals' forces

Solution:
Diamond has a three dimensional rigid structure. In this each carbon atom shares its electrons with four other carbon atoms forming four covalent bonds. Hence statement D is incorrect.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Which of the following statements is not correct regarding the figure given below?

Options:
A Umbrella shaped and free swimming from
B Dominates in life cycle of Aurelia
C Produces polyps sexually in Obelia
D Shows alternation with polyp in Hydra and Adamsia

The correct answer is:
Shows alternation with polyp in Hydra and Adamsia

Solution:
Cnidarians exhibit two basic body forms called polyp and Medusa. The former is a sessile and cylindrical form like Hydra, Adamsia, etc. whereas, the latter is umbrella-shaped and free-swimming like Aurelia or jellyfish, in the above diagram indicating the outline of their body form in Aurelia (Medusa). Those cnidarians which exist in both forms exhibit alternation of generation i.e., polyps produce medusae asexually and medusae from the polyps sexually.

Topic: Biology, Animal Kingdom, NEET
Which of the following statements is not correct?

Options:
A Terylene is a polyester polymer
B The monomer of natural rubber is butadiene.
C Caprolactum is the monomer of nylon -6
D Phenol formaldehyde resin is known as Bakelite

The correct answer is:
The monomer of natural rubber is butadiene.

Solution:
As Monomer of natural rubber is isoprene.

Topic: Chemistry, Polymers, NEET
Which of the following statements is not true

Options:
A the coefficient of friction between two surfaces increases as the surface in contact are made rough
B the force of friction acts in a direction opposite to the applied force
C rolling friction is greater than sliding friction
D the coefficient of friction between wood and wood is less than 1

The correct answer is:
rolling friction is greater than sliding friction

Solution:
Sliding friction is greater than rolling friction.

Topic: Physics, Laws of Motion, NEET
Which of the following statements is not true?

Options:
A The resistance of intrinsic semiconductors decreases with increase of temperature
B Doping pure Si with trivalent impurities give p-type semiconductors
C The majority carriers in n-type semiconductors are holes
D A p-n junction can act as a semiconductor diode

The correct answer is:
The majority carriers in n-type semiconductors are holes

Solution:
In n - type semiconductors, electrons are the majority charge carriers.

Topic: Physics, Semiconductors, NEET
Which of the following statements is not true?

Options:
A Silicon carbide is a covalent crystal
B Molecular crystals are soft in nature
C In calcium fluoride structure, coordination number of Ca2+ is 4
D Increase in radius ratio results in increase in coordination number

The correct answer is:
In calcium fluoride structure, coordination number of Ca2+ is 4

Solution:
As coordination number of Ca2+ in CaF2 is 8 and that of F- is 4 so option C is incorrect.
Silicon carbide (SiC) is a covalent crystaline solid.
Molecular crystals are soft in nature.
Coordination number ∝ radius ratio.

Topic: Chemistry, Solid State, NEET
Which of the following statements is not true ?

Options:
A Sweet potato and potato is an example of analogy
B Homology indicates common ancestry
C Flippers of penguins and dolphins are a pair of homologous organs
D Analogous structures are a result of convergent evolution

The correct answer is:
Flippers of penguins and dolphins are a pair of homologous organs

Solution:
Convergent evolution is the independent evolution of similar features in different and un-related species. Homology is based on divergent evolution whereas analogy/analogous structures are a result of convergent evolution. Analogous organs have different structures, but they evolve for the same function and thus have similarity. For examples, the eye of the octopus and of mammals or the flippers of Penguins and Dolphins.

Topic: Biology, Evolution, NEET, NEET 2022 (Phase 1)
Which of the following statements is not true about potash alum?

Options:
A Its empirical formula is KAl(SO4)2.12H2O
B Its aqueous solution is basic in nature
C It is used in dyeing industry
D On heating, it melts in its water of crystallization

The correct answer is:
Its aqueous solution is basic in nature

Solution:
Here statement B is incorrect as its aqueous solution is acidic in nature, due to hydrolysis of Al2(SO4)3. However, K2SO4 does not hydrolyse. Potash alum is K2SO4.Al2(SO4)3.24H2O which is used in dyeing industry and on heating, it melts in its water of crystallization.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Which of the following statements is not true for both B and Al?

Options:
A They burn in oxygen to give oxides at high temperature
B Their halides are Lewis acids
C They combine with nitrogen to form nitrides
D They react with HCl to form chlorides

The correct answer is:
They react with HCl to form chlorides

Solution:
Boron is not attacked by HCl; whilst Al reacts with HCl to from AlCl3 and H2g .
A. 4B+3O2→2B2O3
4Al+3O2→2Al2O3
B. Halides of both are electron deficient, therefore, act as Lewis acids.
C. 2B+N2→2BN
2Al+N2→2AlN

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Which of the following statements is not true for class Phaeophyceae?

Options:
A Vegetative reproduction takes place by fragmentation.
B The protoplast contains, in addition to plastids, a centrally located vacuole and nucleus.
C Sexual reproduction may be isogamous, anisogamous or oogamous.
D Asexual reproduction by uniflagellate zoospores.

The correct answer is:
Asexual reproduction by uniflagellate zoospores.

Solution:
Members of class phaeophyceae are commonly called Brown algae. In most brown algae asexual reproduction takes place by biflagellate zoospores that are pear-shaped and have two unequal laterally attached flagella. In these algae vegetative reproduction takes place gfragmentation while sexual reproduction takes place by isogamy or anisogamy or oogamy.

Topic: Biology, Plant Kingdom, NEET
Which of the following statements is not true for halogens?

Options:
A All but fluorine shows positive oxidation states.
B All are oxidizing agents.
C All form monobasic oxyacids.
D Chlorine has the highest electron-gain enthalpy.

The correct answer is:
All but fluorine shows positive oxidation states.

Solution:
Fluorine can show only negative oxidation state-1 because it has the highest electronegativity among all elements.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET, NEET 2018
Which of the following statements is not true for plasma membranes?

Options:
A It is present in both plant and animal cells.
B Lipid is present as a bilayer in it. .
C Proteins are present integrated as well as loosely associated with the lipid bilayer.
D Carbohydrates are never found in it.

The correct answer is:
Carbohydrates are never found in it.

Solution:
Chemical studies showed that the cell membrane is composed of lipids that are arranged in a bilayer. Later, biochemical investigation clearly revealed that the cell membranes also possess protein and carbohydrate.

Topic: Biology, Cell - The Unit of Life, NEET
Which of the following statements is not true for retroviruses?

Options:
A DNA is not present at any stage in the life cycle of retroviruses
B Retroviruses carry gene for RNA - dependent DNA polymerase
C The genetic material in mature retroviruses is RNA
D Retroviruses are causative agents for certain kinds of cancer in man

The correct answer is:
DNA is not present at any stage in the life cycle of retroviruses

Solution:
Retroviruses have RNA as the genetic material and hence they exhibit reverse transcription where by DNA is synthesised on RNA template. They have reverse transcriptase as the enzyme.

Topic: Biology, Biological Classification, NEET
Which of the following statements is not true for retroviruses?

Options:
A DNA is not present at any stage in the life cycle of retroviruses
B Retroviruses carry gene for RNAdependent DNA polymerase
C The genetic material in mature retroviruses is RNA
D Retroviruses are causative agents for certain kinds of cancer in man.

The correct answer is:
DNA is not present at any stage in the life cycle of retroviruses

Solution:
Retrovirus once it has infected a cell, it converts its RNA into DNA by reverse transcription. This viral DNA is then inserted into the DNA of the host cell where it starts replicating. For e.g., Human Immunodeficiency Virus (HIV).
Related Theory
Difference Between Retrovirus and Virus
$\begin{array}{|l|l|}
\hline \text{Retrovirus } & \text{Virus } \\
\hline \begin{array}{l}
\text{These have RNA as genetic material.}
\end{array} & \begin{array}{l}
\text{These have RNA and DNA as the genetic material.}
\end{array} \\
\hline \begin{array}{l}
\text{They undergo reverse transcription to} \\
\text{convert the RNA into DNA.}
\end{array} & \begin{array}{l}
\text{Only RNA viruses undergo reverse transcription.}
\end{array} \\
\hline \text{Diplopoda} & \begin{array}{l}
\text{Head + thorax + abdomen}
\end{array} \\
\hline \text{Insecta} & \begin{array}{l}
\text{Head + thorax + abdomen}
\end{array} \\
\hline \text{Onychophora} & \text{Unsegmented body} \\
\hline \text{Merostoma} & \text{Cephalothorax} \\
\hline \text{Arachnida} & \text{Cephalothorax} \\
\hline
\end{array}$

Topic: Biology, Biological Classification, NEET, NEET 2004
Which of the following statements is not true for retroviruses?

Options:
A Retroviruses are causative agents for certain kinds of cancer in man.
B The genetic material in mature retroviruses is RNA.
C Retroviruses carry the gene for RNA-dependent DNA polymerase.
D DNA is not present at any stage in the life cycle of retroviruses.

The correct answer is:
DNA is not present at any stage in the life cycle of retroviruses.

Solution:
Retroviruses have RNA as the genetic material; hence, they exhibit reverse transcription whereby DNA is synthesized on an RNA template by enzyme reverse transcriptase.

Topic: Biology, Human Health and Diseases, NEET
Which of the following statements is not true for stomatal apparatus?

Options:
A Guard cells invariably possess chloroplasts and mitochondria.
B Guard cells are always surrounded by subsidiary cells.
C Stomata are involved in gaseous exchange.
D Inner wall of guard cells are thick.

The correct answer is:
Guard cells are always surrounded by subsidiary cells.

Solution:
The stomata are bordered by two specialized epidermal cells - the guard cells which in some cases are accompanied by subsidiary cells. The walls of guard cells are unevenly thickened. Each guard cell has thick, inelastic inner wall and thin, elastic outer wall, containing chloroplasts. Stomatal aperture is present in between the guard cells. Guard cells are not always surrounded by accessory cells or subsidiary cells.
Related Theory
The specialized epidermal cells which surround the guard cells are known as subsidiary cells. The stem and leaf epidermis of plants possess small pores known as stomata. Each sfoma is surrounded by a pair of specialized cells called guard cells. Guard cells are further surrounded by another group of cells called subsidiary cells. They provide support to the guard cells.

Topic: Biology, Transport in Plants, NEET, NEET 2013 (Karnataka)
Which of the following statements is not true of two genes that show $50 \%$ recombination frequency?

Options:
A the genes may be on different chromosomes
B the genes are tightly linked
C the genes show independent assortment
D if the genes are present on the same chromosome, they undergo more than one crossovers in every meiosis

The correct answer is:
the genes are tightly linked

Solution:
The tightly linked genes on chromosomes show $100 \%$ parental types and $0 \%$ recombinants. Two genes that undergo independent assortment indicated by a recombinant frequency of $50 \%$ are either on non- homologous chromosomes are located far apart in a single chromosome. As the distance between two genes increases, crossover frequency increases. More recombinant gametes, fever parental gametes.

Topic: Biology, Principles of Inheritance and Variation, NEET, NEET 2013 (All India)
Which of the following statements is not true regarding molecular orbital theory?

Options:
A The atomic orbital of comparable energies combine to form molecular orbitals
B An atomic orbital is monocentric while a molecular orbital is polycentric
C Bonding molecular orbital has higher energy than antibonding molecular orbital
D Molecular orbitals like atomic orbitals obey Aufbau principle for filling of electrons

The correct answer is:
Bonding molecular orbital has higher energy than antibonding molecular orbital

Solution:
As bonding molecular orbital has lower energy than the antibonding molecular orbital so statement C is incorrect here.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following statements is NOT true with respect to tubectomy?

Options:
A It is more difficult than vasectomy and is even more difficult to reverse.
B No ovulation occurs after the tubectomy, hence no fertilization.
C It involves ligation of both fallopian tubes.
D The failure rate of this method is almost zero.

The correct answer is:
No ovulation occurs after the tubectomy, hence no fertilization.

Solution:
Contraceptive methods prevent unwanted pregnancy. These methods include Natural, Barrier, Intrauterine devices, Surgical, Chemical, Implants etc.Surgical methods include Vasectomy and Tubectomy. Tubectomy is the ligation of the fallopian tube. It is more difficult than a vasectomy. After this technique, ovulation takes place normally but these ova do not reach the uterus and due to ligation the sperms also cannot meet the ova. Thus menstruation will take place but without ova.

Topic: Biology, Reproductive Health, NEET
Which of the following statements is not true?

Options:
A The partial pressure of oxygen in oxygenated blood is 95 mm Hg
B The partial pressure of oxygen in the alveolar air is 104 mm Hg
C The partial pressure of carbon dioxide in the alveolar air is 40 mm Hg
D The partial pressure of carbon dioxide in deoxygenated blood is 95 mm Hg

The correct answer is:
The partial pressure of carbon dioxide in deoxygenated blood is 95 mm Hg

Solution:
Each gas in the mixture exerts a part of the total pressure proportional to its concentration, ie, the partial pressure. This is denoted as p,e.g., Po2, Pco2.
Partial pressure (mm Hg) of respiratory gases

Gas	Inspired Air	Alveolar Air	Deoxygenated Blood	Oxygenated Bllod	Expired Air

O2	158	100	40	95	116

CO2	0.3	40	46	40	32

Topic: Biology, Breathing and Exchange of Gases, NEET
Which of the following statements is not valid for oxoacids of phosphorus?

Options:
A Orthophosphoric acid is used in the manufacture of triple superphosphate
B Hypophosphorous acid is a diprotic acid
C All oxoacids contain tetrahedral four coordinated phosphorus
D All oxoacids contain at least one $\mathrm{P}=\mathrm{O}$ unit and one $\mathrm{P}-\mathrm{OH}$ group

The correct answer is:
Hypophosphorous acid is a diprotic acid

Solution:
Hypophosphorous acid, $\mathrm{H}_3 \mathrm{PO}_2$, has the following structure.
As it contains only one replaceable $H$-atom (that is attached with $\mathrm{O}$, not with P directly) so it is a monoprotic acid.
All other given statements are true.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET, NEET 2012 (Screening)
Which of the following statements is right?

Options:
A Fronds are found in bryophytes.
B Multiciliate sperms are found in angiosperms.
C Diatoms produce basidiospores.
D Heterocysts are found in Nostoc.

The correct answer is:
Heterocysts are found in Nostoc.

Solution:
Heterocysts are specialized cells found in blue-green algae like
Nostoc, Anabaenopsis Anabaena, Rivukaria, Aul

Topic: Biology, Plant Kingdom, NEET
Which of the following statements is the most appropriate for sickle cell anaemia?

Options:
A It cannot be treated with iron supplements
B It is a molecular disease
C It confers resistance to acquiring malaria
D All of the above

The correct answer is:
All of the above

Solution:
Sickle cell anaemia is a genetic and molecular disease and cannot be treated with external supplements.

Topic: Biology, Molecular Basis of Inheritance, NEET
Which of the following statements is true?

Options:
A Soda lime is a mixture of sodium hydroxide and potassium hydroxide
B Methane can be prepared by Wurtz reaction
C In alkanes all carbon atoms are sp3 hybridised
D neo-Pentane yields three different monochloro derivatives

The correct answer is:
In alkanes all carbon atoms are sp3 hybridised

Solution:
Soda lime is a mixture of NaOH and CaO. Methane can not be obtained by Wurtz reaction. The lowest hydrocarbon prepared by Wurtz reaction is ethane. neo-Pentane yields only one monochloro product.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following statements is true?

Options:
A Most algal genera are diplontic
B Most bryophytes do not have haplo-diplontic life cycle
C All pteridophytes exhibit haplo-diplontic pattern
D Seed bearing plants follow haplontic pattern

The correct answer is:
All pteridophytes exhibit haplo-diplontic pattern

Solution:
(1) Most algal genera are haplontic.
(2) Most bryophytes have haplo-diplontic life cycle pattern.
(3) Statement is absolutely correct that "all pteridophytes exhibit haplo-diplontic pattern".
(4) Seed-bearing plants are gymnosperms and angiosperms and both of them follow diplontic life cycle pattern.

Topic: Biology, Plant Kingdom, NEET, NEET 2023 (Manipur)
Which of the following statements is true about cyanobacteria?

Options:
A It is found in fresh water only.
B It may be unicellular, colonial or filamentous.
C They often form bloom in non-polluted fresh water bodies.
D Colonies are not surrounded by gelatinous sheath.

The correct answer is:
It may be unicellular, colonial or filamentous.

Solution:
Cyanobacteria are found in freshwater, brackish water, and moist soil. They often form bloom in the polluted water body. Colonies of cyanobacteria are surrounded by gelatinous or mucilaginous sheath due to which they become slippery. They may be unicellular, colonial, or filamentous.

Topic: Biology, Biological Classification, NEET
Which of the following statements is true about fungi imperfecti?

Options:
A They do not have sexual phase.
B They include species that prey only on nematodes.
C They include toadstools, puffballs and stinkhorns.
D They include Aspergillus, Colletotrichum, etc.

The correct answer is:
They do not have sexual phase.

Solution:
Fungi are eukaryotic microorganisms. The study of fungi is called mycology. On the basis of their mode of reproduction, fungi are of two types: Perfect fungi and imperfect fungi. Perfect fungi reproduce through asexual and sexual spores whereas imperfect fungi reproduce through an asexual phase. Imperfect fungi are also known as deuteromycota.

Topic: Biology, Biological Classification, NEET
Which of the following statements is true about hydrogen bonding?

Options:
A Cl and N have comparable electronegativities yet there is no H-bonding in HCl because size of Cl is large
B Intermolecular H-bonding results in decrease in m.p. and b.p.
C Ice has maximum density at 0° C due to H-bonding
D KHCl2(HCl2-) exists but KHF2(HF2-) does not exist due to lack of H-bonding in HCl

The correct answer is:
Cl and N have comparable electronegativities yet there is no H-bonding in HCl because size of Cl is large

Solution:
For hydrogen bonding, the size of the atom should be small and electronegativity must be high for e.g. F, O, N. Although chlorine has high electronegativity but due to its larger size hydrogen bonding is not possible with it. KHCl2(HCl2-) don't exists but KHF2(HF2-) exists due to lack of H-bonding in HCl but possible in HF.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following statements is true about the addition of dihydrogen to alkenes?

Options:
A It results in the formation of alkenes.
B It is an exothermic reaction.
C It involves the breaking of a double bond.
D It is typically performed in the absence of any catalyst.

The correct answer is:
It involves the breaking of a double bond.

Solution:
The addition of dihydrogen to alkenes involves the breaking of the double bond in the alkene molecule to form alkanes.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following statements is true about the contraceptive method given below?

Options:
A It is a reversible method of birth control widely used by women in the country.
B It is a surgical intervention in women which eliminates all chances of pregnancy.
C In this procedure, a small incision is made in the abdomen to remove the uterus.
D In this procedure, a small part of the vas deferens is removed or tied up.

The correct answer is:
It is a surgical intervention in women which eliminates all chances of pregnancy.

Solution:
Tubectomy is a sterilization method in women. It is a major surgery in which the fallopian tubes are blocked or cut so that the egg is unable to travel from the ovaries to the uterus, thereby eliminating any chances of pregnancy.

Topic: Biology, Reproductive Health, NEET
Which of the following statements is true about the Grignard reaction?

Options:
A It produces carboxylic acids.
B It can be carried out in the presence of water.
C It always produces primary alcohols.
D It involves the formation of pi (π) bonds.

The correct answer is:
It involves the formation of pi (π) bonds.

Solution:
The Grignard reaction involves the formation of pi (π) bonds.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following statements is true about the reaction of phenol with zinc dust?

Options:
A It is an oxidation reaction.
B It is an acid-base reaction.
C It is a reduction reaction.
D It is a substitution reaction.

The correct answer is:
It is a reduction reaction.

Solution:
The reaction of phenol with zinc dust is a reduction reaction, as phenol is reduced to benzene.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET