datavorous/entrance-exam-dataset huggingface dataset:
Which one of the following statements is not correct?

Options:
A Moissan boron is amorphous
B The reaction between boron and concentrated $\mathrm{HNO}_3$ gives $\mathrm{N}_2 \mathrm{O}$
C Amorphous boron on heating with oxygen forms $\mathrm{B}_2 \mathrm{O}_3$
D Boron is a non-conductor of electricity

The correct answer is:
The reaction between boron and concentrated $\mathrm{HNO}_3$ gives $\mathrm{N}_2 \mathrm{O}$

Solution:
Boron reacts with concentrated $\mathrm{HNO}_3$ to give orthoboric acid and nitrogen dioxide.
$\mathrm{B}+3 \mathrm{HNO}_3 \longrightarrow \mathrm{H}_3 \mathrm{BO}_3+3 \mathrm{NO}_2$

Topic: Chemistry, p Block Elements (Group 13 & 14), JEE Main
Which one of the following statements is not correct?

Options:
A
Alcohols are weaker acids than water

B
Acid strength of alcohols decreases in the following $\mathrm{RCH}_2 \mathrm{OH}>\mathrm{R}_2 \mathrm{CHOH}>\mathrm{R}_3 \mathrm{COH}$

C
Carbon-oxygen bond length in methanol, $\mathrm{CH}_3 \mathrm{OH}$ is shorter than that of $\mathrm{C}-\mathrm{O}$ bond length in phenol.

D

The correct answer is:
Carbon-oxygen bond length in methanol, $\mathrm{CH}_3 \mathrm{OH}$ is shorter than that of $\mathrm{C}-\mathrm{O}$ bond length in phenol.

Solution:
The $\mathrm{C}-\mathrm{O}$ bond length in alcohols is $142 \mathrm{pm}$ and in Phenol it is $136 \mathrm{pm}$. The $\mathrm{C}-\mathrm{O}$ bond length in phenol is shorter than that in methanol due to the conjugation of unshared pair of electrons on oxygen with the ring, which imparts double bond character to the $\mathrm{C}-\mathrm{O}$ bond.

Topic: Chemistry, Alcohols Phenols and Ethers, JEE Main
Which one of the following statements is "not correct" about cationic detergents?

Options:
A Cationic detergents are quaternary ammonium salts
B Cationic part contains a long hydrocarbon chain
C Cationic detergents exhibit gemicidal properties
D Cationic detergents are cheap and are widely used

The correct answer is:
Cationic detergents are cheap and are widely used

Solution:
Cationic detergents are quaternary ammonium salts of amines with acetate and halides as anions. They are the long hydrocarbon chain of cationic part has the positive charge on nitrogen atom. The cationic part is having the active site. It has the gemicidal properties. For eg:- Cetyl trimethyl ammonium bromide

Topic: Chemistry, Chemistry in Everyday Life, JEE Main
Which one of the following statements is not correct?

Options:
A The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium
B Enzymes catalyse mainly bio-chemical reactions
C Coenzymes increase the catalytic activity of enzyme
D Catalyst does not initiate any reaction

The correct answer is:
The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium

Solution:
As Catalyst does not change the value of equilibrium constant (Keq.) so statement A is wrong. Rest other are correct features of catalyst.

Topic: Chemistry, Surface Chemistry, NEET
Which one of the following statements is 'NOT" the property of light?

Options:
A Light involves transportation of energy.
B Light can travel through vacuum.
C Light requires material medium for propagation.
D Light has finite speed.

The correct answer is:
Light requires material medium for propagation.

Solution:
Light is electromagnetic in nature it does not require any material medium for its propogation.

Topic: Physics, Electromagnetic Waves, JEE Main
Which one of the following statements is not true?

Options:
A
$\mathrm{pH}+\mathrm{pOH}=14$ for all aqueous solutions

B
The $\mathrm{pH}$ of $1 \times 10^{-8} \mathrm{M}$ HCI is 8

C
96,500 coulombs of electricity when passed through a $\mathrm{CuSO}_4$ solution deposits 1 gram equivalent of
copper at the cathode

D
The conjugate base of $\mathrm{H}_2 \mathrm{PO}_4^{-}$is $\mathrm{HPO}_4^{2-}$

The correct answer is:
The $\mathrm{pH}$ of $1 \times 10^{-8} \mathrm{M}$ HCI is 8

Solution:
An acidic solution cannot have a $\mathrm{pH}>7$.

Topic: Chemistry, Ionic Equilibrium, JEE Main, JEE Main 2003
Which one of the following statements is not true about enzymes?

Options:
A Enzymes are non-specific for a reaction and substrate.
B Almost all enzymes are proteins.
C Enzymes work as catalysts by lowering the activation energy of a biochemical reaction.
D The action of enzymes is temperature and pH specific

The correct answer is:
Enzymes are non-specific for a reaction and substrate.

Solution:
Enzymes are very specific in nature.

Topic: Chemistry, Chemistry in Everyday Life, JEE Main, JEE Main 2021 (20 Jul Shift 2)
Which one of the following statements is NOT true about the effect of an increase in temperature on the distribution of molecular speeds in a gas?

Options:
A
The most probable speed increases

B
The fraction of the molecules with the most probable speed increases

C
The distribution becomes broader

D
The area under the distribution curve remains the same as under the lower temperature

The correct answer is:
The fraction of the molecules with the most probable speed increases

Solution:
Most probable velocity increase and fraction of molecule possessing most probable velocity decreases

Topic: Chemistry, States of Matter, JEE Main, JEE Main 2005
Which one of the following statements is totally wrong about greater biological diversity in tropics?

Options:
A Tropical latitude have remained relatively undisturbed for millions of years.
B Tropical environment is more or less constant and predictable.
C Soil here is very fertile.
D More solar energy is available.

The correct answer is:
Soil here is very fertile.

Solution:
The region near the middle of the Earth between the Tropic of Cancer and Tropic of Capricorn is considered as the tropic region. This region receives the most amount of solar energy which leads to better productivity and higher species diversity. Also, the seasonal variations in such regions are low and the environment mainly remains the same supporting high species richness and promoting niche specialization. Although, the soil of the tropical forest is low in nutrients and the majority of the nutrients are stored in the vegetation and trees. Due to the warm climatic condition of the region, dead organisms are decomposed quickly providing nutrients to the plants.

Topic: Biology, Organisms and Populations, NEET
Which one of the following statements is totally wrong about the occurrence of notochord, while the other three are correct?

Options:
A It is present only in larval tail in Ascidians
B It is replaced by a vertebral column in adult frog
C It is absent throughout life in humans from the very beginning
D It is present throughout life in Amphioxus

The correct answer is:
It is absent throughout life in humans from the very beginning

Solution:
The notochord is a flexible, rod-shaped body found in embryo of all chordates. It is composed of cells derived from the mesoderm. It represents the primitive axis of embryo. In some chordates, it persists throughout life as the main axial support of the body (e.g., Amphibians), while in most vertebrates including humans it becomes the vertebral body of the vertebral column.

Topic: Biology, Animal Kingdom, NEET, NEET 2011 (Mains)
Which one of the following statements is totally wrong about the occurrence of notochord, while the other three are CORRECT?

Options:
A It is present only in larval tail in Ascidians.
B It is replaced by a vertebral column in frog.
C It is absent throughout life in humans from the very beginning.
D It is present throughout life in Amphioxus.

The correct answer is:
It is absent throughout life in humans from the very beginning.

Solution:
Animal kingdom is divided into two main groups Non Chordates and Chordates on the basis of absence and presence of notochord. Non chordates include Phylum porifera to phylum Echinoderms. Chordates are further divided into Protochordates and Vertebrates. These animals are classified on the basis of when is notochord present and whether it forms vertebral column or not. Protochordates include Urochordates and Cephalochordates. Urochordates include those animals that show presence of notochord in the tail region. Examples: Tunicates. Cephalochordates show notochord throught out life and this is seen in Amphioxus. Frog and Humans are Vertebrates and in them notochord is replaced by vertebral column.

Topic: Biology, Animal Kingdom, NEET
Which one of the following statements is true?

Options:
A Saponification of oil yields a diol
B Drying of oil involves hydrolysis
C Addition of antioxidant to oil minimizes rancidity
D Refining of oil involves hydrogenation

The correct answer is:
Addition of antioxidant to oil minimizes rancidity

Solution:
Saponification of oils yields a triol (glycerol). Drying (hardening) of oil involves hydrogenation. Refining of oil is done by distillation or other such processes but not by hydrogenation.
Antioxidants are added to prevent the oxidation of oil, thus they minimizes rancidity.

Topic: Chemistry, Aldehydes and Ketones, JEE Main
Which one of the following statements is true for the speed $v$ and the acceleration $a$ of particle executing simple harmonic motion?

Options:
A When $v$ is maximum, $a$ is maximum
B Value of $a$ is zero, whatever may be value of $v$
C When $v$ is zero, $a$ is zero
D When $v$ is maximum $a$ is zero

The correct answer is:
When $v$ is maximum $a$ is zero

Solution:
In SHM
$\text {Velocity }=A \omega \sin \left(\omega t+\frac{\pi}{2}\right)$
Acceleration $= A \omega^2 \sin (\omega t+\pi)$
This shows that $V$ is max then $a=0$

Topic: Physics, Oscillations, JEE Main
Which one of the following statements is wrong?

Options:
A When pollen is shed at two-celled stage, double fertilization does not take place
B Vegetative cell is larger than generative cell
C Pollen grains in some plants remain viable for months
D Intine is made up of cellulose and pectin

The correct answer is:
When pollen is shed at two-celled stage, double fertilization does not take place

Solution:
Before pollination the protoplast of pollen grain divides into two unequal cells small generative cell and large tube or vegetative cell. In some species the generative cell divides into two male gametes prior to dehiscence of pollen grain. Therefore at the time of pollination the pollen grain is either 2-celled or 3-celled.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET, NEET 2012 (Mains)
Which one of the following statements is wrong?

Options:
A de-Broglie's wavelength is given by λ=hmv , were m=mass of the particle,v=group velocity of the particle.
B The uncertainty principle is ΔE×Δt≥h4π.
C Half-filled and fully-filled orbitals have greater stability due to the greater exchange energy, greater symmetry and more balanced arrangement.
D The energy of 2s orbital is less than the energy of 2p orbital in case of hydrogen-like atoms.

The correct answer is:
The energy of 2s orbital is less than the energy of 2p orbital in case of hydrogen-like atoms.

Solution:
(i) λ=hp=hmv
(ii) Δx.Δp=h4π
Δx×Δp×dtΔt≥h4π ∴ΔpΔt=f
fΔx    Δt≥h4π, fΔx=ΔE
ΔE.Δt≥h4π
(iii) 3rd statement is true.
(iv) The energy of 2s-orbital and 2p-orbital in case of hydrogen like atoms is equal because they are single electron species.

Topic: Chemistry, Structure of Atom, JEE Main
Which one of the following statements is wrong for an isobaric process?

Options:
A The pressure of the system remains constant
B There is change in volume when work is done
C Temperature of the system remains constant
D Energy exchanged is sued to do work to change internal energy

The correct answer is:
Temperature of the system remains constant

Solution:
Temperature of the system changes in isobaric process.

Topic: Physics, Thermodynamics, MHT CET, MHT CET 2021 (23 Sep Shift 2)
Which one of the following statements pertaining to plant structure is correct?

Options:
A Cork lacks stomata, but lenticels carry out transpiration.
B Passage cells help in transfer of food from cortex to phloem.
C Sieve tube elements possess cytoplasm but no nuclei.
D The shoot apical meristem has a quiescent centre.

The correct answer is:
Sieve tube elements possess cytoplasm but no nuclei.

Solution:
Mature cork cells are plant cells that form the protective water resistant tissue in the outer covering of stems and trunks. Cork cells are genetically programmed not to divide, but instead to remain as they are dead cells. Cork cells possess lenticels. A lenticel is produced beneath a former stomata or stoma of the epidermis. They encloses intercellular space for gaseous exchange. Passage cells help in transfer of water from cortex. Quiescent centre is present in root apical meristem.

Topic: Biology, Anatomy of Flowering Plants, AIIMS, AIIMS 2005
Which one of the following statements regarding helium is incorrect ?

Options:
A It is used to produce and sustain powerful superconducting magnets
B It is used as a cryogenic agent for carrying out experiments at low temperatures
C It is used to fill gas balloons instead of hydrogen because it is lighter and non-inflammable
D It is used in gas-cooled nuclear reactors

The correct answer is:
It is used to fill gas balloons instead of hydrogen because it is lighter and non-inflammable

Solution:
Helium is twice as heavy as hydrogen, its lifting power is $92 \%$ of that of hydrogen. Helium has the lowest melting and boiling point of any element which makes liquid helium an ideal coolant for many extremely low temperature application such as super conducting magnet and cryogenic research where temperature close to absolute zero are needed.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), JEE Main
Which one of the following statements regarding Henry's law is not correct?

Options:
A Different gases have different KH (Henry's law constant) values at the same temperature
B The partial pressure of the gas in vapour phase is proportional to the mole fraction of the gas in the solution
C Higher the value of KH at a given pressure, higher is the solubility of the gas in the liquids
D The value of KH increases with increase of temperature and KH is function of the nature of the gas

The correct answer is:
Higher the value of KH at a given pressure, higher is the solubility of the gas in the liquids

Solution:
p=KH.x
Where KH= Henry law constant

p = partial pressure

x = amount soluble
Henry's constant increases with increase in temperature while it decreases with increase in solubility.

Hence value of KH increases as solubility of gas increases is a wrong statement.

Topic: Chemistry, Solutions, JEE Main, JEE Main 2019 (09 Jan Shift 1)
Which one of the following statements regarding Henry's law is not correct?

Options:
A The value of KH changes with the nature of the gas.
B Higher the value of KH at a given pressure, higher is the solubility of the gas in the liquids
C The partial pressure of the gas in vapour phase is proportional to the mole fraction of the gas in the solution.
D Different gases have different KH (Henry's law constant) value at the same temperature.

The correct answer is:
Higher the value of KH at a given pressure, higher is the solubility of the gas in the liquids

Solution:
Liquid solution Pgas=KHÃXgas as KHâ1Xgas
So, more is KH less is solubility. Solubility of gases is less at higher temperature. So more is the temperature more is the KH as KHâ1solubilityâ temperature

Topic: Chemistry, Solutions, JEE Main
Which one of the following statements regarding the population of different conformers butane-2, 3-diol is true?

Options:
A The most populated conformer will have the hydroxyl groups of the gauche position.
B The most populated conformer will have the hydroxyl groups at the anti position.
C All staggered conformations will be equally populated.
D Relative populations of different conformers is not predictable

The correct answer is:
The most populated conformer will have the hydroxyl groups of the gauche position.

Solution:
Intramolecular hydrogen bonding is possible in this conformation which makes is more stable than anti form.

Topic: Chemistry, General Organic Chemistry, JEE Main
Which one of the following structures in pheretima is correctly matched with its function?

Options:
A Clitellum-Secretes cocoon
B Gizzard-Absorbs digested food
C Setae-Defence against predators
D Typhlosole-Storage of extra nutrients

The correct answer is:
Clitellum-Secretes cocoon

Solution:
In earthworm, mature sperm and egg cells and nutritive fluid are deposited in cocoons secreted by the gland cells of clitellum.

Topic: Biology, Structural Organisation in Animals, NEET, NEET 2011 (Mains)
Which one of the following structures is an organelle within an organelle?

Options:
A Ribosome
B Peroxisome
C $\mathrm{ER}$
D Mesosome

The correct answer is:
Ribosome

Solution:
Ribosomes are smallest known electron microscopic ribonucleoprotein particles attached either to endoplasmic reticulum, floating free in cytoplasm and also found in mitochondria and chloroplast (these are called organeller ribosomes). These are site of protein synthesis.

Topic: Biology, Cell - The Unit of Life, NEET, NEET 2012 (Mains)
Which one of the following structures represents the neoprene polymer?

Options:
A
B
C
D

The correct answer is:

Solution:
Polymer :	Neoprene –

Monomer :	Chloroprene

Property :	Resembles natural rubber but not inflammable

Uses :	Conveyor belts in mines

Topic: Chemistry, Polymers, JEE Main, JEE Main 2015 (11 Apr Online)
Which one of the following structures represents the neoprene rubber?

Options:
A
B
C
D

The correct answer is:

Solution:
Neoprene is obtained from chloroprene, which is 2-chlorobuta-1,3-diene. It is an addition homopolymer with rubber-like structure and properties.

The structure of neoprene:

Neoprene expresses good chemical stability and maintains flexibility over a wide temperature range.

Topic: Chemistry, Polymers, AP EAMCET, AP EAMCET 2018 (25 Apr Shift 1)
Which one of the following structures represents the peptide chain

Options:
A

B

C

D

The correct answer is:

Solution:
In peptide linkage i.e., $-\mathrm{CONH}$ - group, the carboxyl group of one amino acid molecules forms an amide by combination with the amino group of the next amino acid molecule with the liberation of water molecule.

Topic: Chemistry, Biomolecules, JEE Main
Which one of the following substances adsorb hydrogen gas most strongly

Options:
A Activated carbon
B Silica gel
C Platinum black
D Iron powder

The correct answer is:
Platinum black

Solution:
Platinum, Platinum black, platinised platinum have high capacity to absorb hydrogen and hence can be used as an electrode material catalyst.

Topic: Chemistry, Surface Chemistry, JEE Main
Which one of the following substances has the highest proton affinity?

Options:
A
$\mathrm{H}_2 \mathrm{~S}$

B
$\mathrm{NH}_3$

C
$\mathrm{PH}_3$

D
$\mathrm{H}_2 \mathrm{O}$

The correct answer is:
$\mathrm{NH}_3$

Solution:
No Solution Available

Topic: Chemistry, Chemical Bonding and Molecular Structure, JEE Main, JEE Main 2003
Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution?

Options:
A Sulphur dioxide
B Carbon dioxide
C Nitrogen dioxide
D Tetrachloroethylene

The correct answer is:
Carbon dioxide

Solution:
CO2 is used in dry cleaning is a better strategy to control environmental pollution. Liquid carbon dioxide is better to replace conventional halogenated solvents which are potentially carcinogenic. These detergents are developed in a way that one end of the molecule is soluble in non-polar substances like grease, oil stains and the other end dissolves in liquid carbon dioxide.

Topic: Chemistry, Environmental Chemistry, JEE Main, JEE Main 2016 (10 Apr Online)
Which one of the following substituents at para-position is most effective in stabilizing the phenoxide ion ?

Options:
A -CH3
B -OCH3
C -COCH3
D -CH2OH

The correct answer is:
-COCH3

Solution:
Electron withdrawing group increases the stability of phenoxide So

would be the best substituent.

Topic: Chemistry, Alcohols Phenols and Ethers, JEE Main, JEE Main 2014 (19 Apr Online)
Which one of the following symptoms is not due to manganese toxicity in plants?

Options:
A
Calcium translocation in shoot opex is inhibit

B
Deficiency in both iron and nitrogen induced

C
Appearance of brown spot surrounded by chlorotic veins

D
None of the above

The correct answer is:
None of the above

Solution:
Manganese is an essential micronutrient mainly required by the leaves and seeds of plants. Manganese becomes toxic when absorded by plants in higher amounts. Its toxicity causes reduced uptake of $\mathrm{Fe}^2, \mathrm{Mg}^{2+}$ and $\mathrm{N}$, inhibition of $\mathrm{Ca}^{2+}$ translocation in shoot apex, brown spots surrounded by chlorotic veins etc.

Topic: Biology, Mineral Nutrition
Which one of the following techniques is not used to spot components of a mixture separated on thin layer chromatographic plate?

Options:
A I2 (Solid)
B U.V. Light
C Visualisation agent as a component of mobile phase
D Spraying of an appropriate reagent

The correct answer is:
Visualisation agent as a component of mobile phase

Solution:
Thin Layer Chromatography is a technique used to isolate non-volatile mixtures. The experiment is conducted on a sheet of aluminium foil, plastic, or glass which is coated with a thin layer of adsorbent material. The material usually used is aluminium oxide, cellulose, or silica gel.

The sample spots can be observed under a UV light chamber, I2 solid or by spraying of an appropriate reagent which can react with the sample spot.

Topic: Chemistry, General Organic Chemistry, JEE Main, JEE Main 2022 (28 Jun Shift 1)
Which one of the following techniques is safest for the detection of cancer?

Options:
A Magnetic Resonance Imaging (MRI)
B Radiography (X-ray)
C Computed Tomography (CT)
D Histopathological Studies

The correct answer is:
Magnetic Resonance Imaging (MRI)

Solution:
Magnetic Resonance Imaging (MRI) is a non-invasive technique, which uses strong magnetic field and provides information about chemistry, metabolic and biochemical data of tissue without time consuming chemical analysis. It is the safest technique for the detection of cancer since it does not utilize radiations and therefore, does not cause any side effect.
Histopathological study is not safe as it is invasive technique while radiography and Computed Tomography (CT) use harmful $\mathrm{X}$-rays.

Topic: Biology, Human Health and Diseases, NEET, NEET 2010 (Mains)
Which one of the following techniques made it possible to genetically engineer living organism?

Options:
A Recombinant DNA techniqques
B X-ray diffraction
C Heavier isotope labelling
D Hybridization

The correct answer is:
Recombinant DNA techniqques

Solution:
Recombinant DNA technology is joining together of DNA molecules from two different species that are inserted into a host organism to produce new genetic combinations.

Topic: Biology, Biotechnology and Its Applications, NEET, NEET 2011 (Mains)
Which one of the following tests used for the identification of functional groups in organic compounds does not use copper reagent?

Options:
A Seliwanoff's test
B Biuret test for peptide bond
C Barfoed's test
D Benedict's test

The correct answer is:
Seliwanoff's test

Solution:
Seliwanoff's Test : This test is used to detect the presence of Ketohexose.
Reagent : Resorcinol + conc. HCl.
Barfoed's Test : It is used to detect Monosaccharide by reduction of Cu(II) into Copper (I). Fehling Solution: It is used to detect aldehyde by reduction Cu(II) into Cu(I). Biuret Test : Use to detect presence of peptide bond in protein by reduction of Cu(II) into Cu(I).

Topic: Chemistry, Biomolecules, JEE Main, JEE Main 2021 (27 Aug Shift 2)
Which one of the following transition metal ions is diamagnetic?

Options:
A Co2+
B Ni2+
C Cu2+
D Zn2+

The correct answer is:
Zn2+

Solution:
Zn2+ ions have all paired electrons so, it is diamagnetic .

Topic: Chemistry, d and f Block Elements, JEE Main
Which one of the following types of drugs reduces fever?

Options:
A
Analgesic

B
Antipyretic

C
Antibiotic

D
Tranquiliser

The correct answer is:
Antipyretic

Solution:
No Solution Available

Topic: Chemistry, Chemistry in Everyday Life, JEE Main, JEE Main 2005