datavorous/entrance-exam-dataset huggingface dataset:
Which halogen reaction with dihydrogen requires a catalyst?

Options:
A Fluorine (F2)
B Chlorine (Cl2)
C Bromine (Br2)
D Iodine (I2)

The correct answer is:
Iodine (I2)

Solution:
The reaction between dihydrogen and iodine (I2) requires a catalyst.

Topic: Chemistry, Hydrogen, NEET
Which halogen reacts with water to form a non-spontaneous reaction?

Options:
A Chlorine
B Bromine
C Iodine
D Fluorine

The correct answer is:
Iodine

Solution:
The reaction of iodine with water is non-spontaneous.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which halogenation reaction is known to be the slowest and requires more severe reaction conditions?

Options:
A Chlorination
B Bromination
C Iodination
D Fluorination

The correct answer is:
Iodination

Solution:
Iodination is the slowest halogenation reaction and often requires more severe reaction conditions compared to other halogens.

Topic: Chemistry, Hydrocarbons, NEET
Which halogenation reaction is most reactive towards alkane substitution?

Options:
A Fluorination
B Chlorination
C Bromination
D Iodination

The correct answer is:
Fluorination

Solution:
Among the halogenation reactions, fluorination is the most reactive towards alkane substitution due to the highly reactive nature of fluorine.

Topic: Chemistry, Hydrocarbons, NEET
Which halogenation reaction is most reactive towards alkane substitution?

Options:
A Chlorination
B Bromination
C Iodination
D Fluorination

The correct answer is:
Fluorination

Solution:
Among the halogenation reactions, fluorination is the most reactive towards alkane substitution due to the highly reactive nature of fluorine.

Topic: Chemistry, Hydrocarbons, NEET
Which halogenation reaction is most selective when adding to alkenes to form alkyl halides?

Options:
A Chlorination
B Bromination
C Iodination
D Fluorination

The correct answer is:
Iodination

Solution:
Iodination is the most selective when adding to alkenes to form alkyl halides. The larger size and high reactivity of iodine make it more selective in its addition reaction.

Topic: Chemistry, Hydrocarbons, NEET
Which halogenation reaction is the most reactive toward alkane substitution due to the highly reactive nature of the halogen used?

Options:
A Chlorination
B Bromination
C Iodination
D Fluorination

The correct answer is:
Fluorination

Solution:
Among the halogenation reactions, fluorination is the most reactive toward alkane substitution due to the highly reactive nature of fluorine.

Topic: Chemistry, Hydrocarbons, NEET
Which halogenation reaction is typically not used for practical synthesis due to its low reactivity?

Options:
A Chlorination
B Bromination
C Iodination
D Fluorination

The correct answer is:
Iodination

Solution:
Iodination is not commonly used for practical synthesis due to its low reactivity compared to other halogenation reactions.

Topic: Chemistry, Hydrocarbons, NEET
Which halogens are commonly used in the Hell-Volhard-Zelinsky reaction to halogenate carboxylic acids?

Options:
A Chlorine and iodine
B Bromine and iodine
C Chlorine and fluorine
D Fluorine and bromine

The correct answer is:
Bromine and iodine

Solution:
Bromine and iodine are commonly used halogens in the Hell-Volhard-Zelinsky reaction to halogenate carboxylic acids.

Topic: Chemistry, Aldehydes, Ketones and Carboxylic Acids, NEET
Which halogens are sparingly soluble in water but soluble in organic solvents?

Options:
A Chlorine and iodine
B Chlorine and bromine
C Fluorine and iodine
D Fluorine and bromine

The correct answer is:
Fluorine and iodine

Solution:
Bromine and iodine are sparingly soluble in water but are soluble in various organic solvents.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which halogens react with water?

Options:
A Fluorine and iodine
B Fluorine and chlorine
C Chlorine and bromine
D Iodine and bromine

The correct answer is:
Fluorine and chlorine

Solution:
Fluorine and chlorine are the halogens that react with water.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which harmonic mode of a 30.0 cm long pipe open at both ends resonates with a 1.1 kHz source?Take the speed of sound in air as 330 m ${{s}^{-1}}$.

Options:
A First harmonic
B Second harmonic
C Third harmonic
D Fourth harmonic

The correct answer is:
Second harmonic

Solution:
Correct Option is : (B)
Second harmonic

Topic: Chemistry, Waves and Sound, NEET
Which has highest $\mathrm{pH}$ ?

Options:
A $\mathrm{CH}_3 \mathrm{COOK}$
B $\mathrm{Na}_2 \mathrm{CO}_3$
C $\mathrm{NH}_4 \mathrm{Cl}$
D $\mathrm{NaNO}_3$

The correct answer is:
$\mathrm{Na}_2 \mathrm{CO}_3$

Solution:
$\mathrm{NaNO}_3$ is salt formed by the combination of a strong acid $\mathrm{HNO}_3$ and a strong base $\mathrm{NaOH}$ and hence it is neutral with a $\mathrm{pH}$.
$\mathrm{CH}_3 \mathrm{COOK}$ is formed by the combination of weak acid $\mathrm{CH}_3 \mathrm{COOH}$ and strong base $\mathrm{KOH}$ and hence $\mathrm{pH}$ will be above 7 .
$\mathrm{NH}_4 \mathrm{Cl}$ is formed by the formation of strong and $\mathrm{HCl}$ and a weak base $\mathrm{NH}_4 \mathrm{OH}$ and hence $\mathrm{pH}$ will be lesser than 7.
$\mathrm{Na}_2 \mathrm{CO}_3$ is a salt formed by the strong base $\mathrm{NaOH}$ and weak acid $\mathrm{H}_2 \mathrm{CO}_3$. Hence, $\mathrm{pH}$ of the salt will be highest.
The pH scale was invented in 1909 by a Danish biochemist Soren Sorensen. It describes how many hydrogen ions (protons) are present in a solution: the higher the pH, the lower the hydrogen ion concentration, and vice versa. But the scale does not have fixed limits, so it is indeed possible to have a pH above 14 or below zero. For example, concentrated hydrochloric acid can have a pH of around -1 , while sodium hydroxide solution can have a pH as high as 15 .

Topic: Chemistry, Ionic Equilibrium, NEET, NEET 2002
Which has maximum dipole moment?

Options:
A
B
C
D

The correct answer is:

Solution:
Here has maximum dipole moment as resultant dipole moment of three polar bonds will be maximum in 1, 2, 3-trichlorobenzene. In case of option C and D dipole moment is zero.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which has maximum number of oxo groups?

Options:
A H2SO4
B H2SO3
C H3PO3
D H3PO4

The correct answer is:
H2SO4

Solution:
Here H2SO4 has maximum number of oxo groups that is two.
M=O bonds are called oxo bonds in inorganic compounds. H2SO4 has two S=O bonds; whereas H2SO3 has one S=O bond, H3PO3 has one P=O and H3PO4 also has one P=O bond.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which has Sulphur atom in its structure?

Options:
A Histamine
B cimetidine
C Ranitidine
D Both b and c

The correct answer is:
Both b and c

Solution:
Correct Option is : 4
Both b and c

Topic: Chemistry, Chemistry in Everyday Life, NEET
. Which has the highest conductivity among the following-

Options:
A Graphite
B Gold
C Silver
D Copper

The correct answer is:
Silver

Solution:
Correct Option is : 3
Silver

Topic: Chemistry, Electrochemistry, NEET
Which has the highest threshold frequency from the following ?

Options:
A Li (work function = 2.42)
B Na(work function = 2.3)
C k (work function = 2.25)
D Mg (work function = 3.7)

The correct answer is:
Mg (work function = 3.7)

Solution:
Correct Option is : 4
Mg (work function = 3.7)

Topic: Chemistry, Structure of Atom, NEET
Which has the highest threshold wavelength from the following ?

Options:
A Li (work function = 2.42)
B Na(work function = 2.3)
C k (work function = 2.25)
D Mg (work function = 3.7)

The correct answer is:
k (work function = 2.25)

Solution:
Correct Option is : 3
k (work function = 2.25)

Topic: Chemistry, Structure of Atom, NEET
Which has the maximum molecules?

Options:
A $7 g \mathrm{~N}_2$
B $2 \mathrm{H}_2$
C $16 \mathrm{~g} \mathrm{NO}_2$
D $16 \mathrm{O}_2$

The correct answer is:
$2 \mathrm{H}_2$

Solution:
no. of moles = mass of molecule/ molecular weight.
$7 g \mathrm{~N}_2 \rightarrow \frac{7}{28}=0.25$ moles
$2 \mathrm{~g} \mathrm{H}_2 \rightarrow \frac{2}{2}=1$ mole
$16 \mathrm{~g} \mathrm{NO}_2 \rightarrow \frac{16}{46}=0.347 \mathrm{moles}$
$16 \mathrm{~g} \mathrm{O}_2 \rightarrow \frac{16}{32}=0.5$ moles

Topic: Chemistry, Some Basic Concepts of Chemistry, NEET, NEET 2002
Which health condition can be caused by excess nitrate in drinking water?

Options:
A Hypertension
B Diabetes
C Methemoglobinemia
D Osteoporosis

The correct answer is:
Methemoglobinemia

Solution:
Excess nitrate in drinking water can lead to methemoglobinemia, commonly known as 'blue baby' syndrome, which is a condition that reduces the oxygen-carrying capacity of the blood.

Topic: Chemistry, Environmental Chemistry, NEET
Which hormonal deficiency is responsible for cretinism?

Options:
A Thyroid
B Thyroxin
C Insulin
D Glucagon

The correct answer is:
Thyroid

Solution:
Deficiency of thyroid hormone is responsible for cretinism

Topic: Biology, Chemical Coordination and Integration, NEET
Which hormonal deficiency is responsible for Diabetes mellitus?

Options:
A Insulin
B Thyroxin
C Thyroid
D Testosterone

The correct answer is:
Insulin

Solution:
Deficiency of insulin hormone is responsible for Diabetes mellitus

Topic: Biology, Chemical Coordination and Integration, NEET
Which hormone action is shown in the figure?

Options:
A Protein hormone
B Steroid Hormone
C Fat hormone
D None of the above

The correct answer is:
Protein hormone

Solution:
Protien hormones interact with membrane-bound receptors normally do not enter the target cell, but generate second messengers.

Topic: Biology, Chemical Coordination and Integration, NEET
Which hormone action is shown in the figure?

Options:
A Protein hormone
B Steroid Hormone
C Fat hormone
D None of the above

The correct answer is:
Steroid Hormone

Solution:
Steroid hormones interact with intacellular receptors.

Topic: Biology, Chemical Coordination and Integration, NEET
Which hormone acts on both pancreas and gall bladder and stimulates the secretion of pancreatic enzymes and bile juice, respectively?

Options:
A Atrial natriuretic factor (ANF)
B Erythropoietin
C Cholecystokinin (CCK)
D Gastric inhibitory peptide (GIP)

The correct answer is:
Cholecystokinin (CCK)

Solution:
Cholecystokinin (CCK) acts on both pancreas and gall bladder and stimulates the secretion of pancreatic enzymes and bile juice, respectively.

Topic: Biology, Chemical Coordination and Integration, NEET
Which hormone acts on Sertoli cells?

Options:
A LH
B FSH
C Inhibin
D Testosterone.

The correct answer is:
FSH

Solution:
FSH →stimulates Sertoli cells → Stimulates secretion of some factors which promote the process of spermiogenesis.

Topic: Biology, Human Reproduction, NEET
Which hormone acts on the exocrine pancreas and stimulates secretion of water and bicarbonate ions?

Options:
A Atrial natriuretic factor (ANF)
B Erythropoietin
C Gastrin
D Secretin

The correct answer is:
Secretin

Solution:
Secretin acts on the exocrine pancreas and stimulates secretion of water and bicarbonate ions.

Topic: Biology, Chemical Coordination and Integration, NEET
Which hormone acts on the gastric glands and stimulates the secretion of hydrochloric acid and pepsinogen?

Options:
A Atrial natriuretic factor (ANF)
B Erythropoietin
C Gastrin
D Secretin

The correct answer is:
Gastrin

Solution:
Gastrin acts on the gastric glands and stimulates the secretion of hydrochloric acid and pepsinogen.

Topic: Biology, Chemical Coordination and Integration, NEET
Which hormone acts on the gastric glands, and stimulates the secretion of hydrochloric acid and pepsinogen?

Options:
A Renin
B Glucagon
C Insulin
D Gastrin

The correct answer is:
Gastrin

Solution:
Endocrine cells present in different parts of the gastro-intestinal tract secrete four major peptide hormones, namely, gastrin, secretin, cholecystokinin (CCK) and gastric inhibitory peptide (GIP).

Topic: Biology, Digestion and Absorption, NEET
Which hormone causes dilation of blood vessels, increased oxygen consumption and glucogenesis?

Options:
A glucagon
B $\mathrm{ACTH}$
C insulin
D adrenaline

The correct answer is:
adrenaline

Solution:
Adrenaline (epinephrine) is a hormone produced by the adrenal medulla and is secreted in great amounts during emotional stress. It elevates the glucose level in the blood stream (by glycogenolysis) which is accompanied by an increase in oxygen consumption, body temperature and heat production. Adrenaline also causes an increase in the flow of blood by dilating the blood vessels. Insulin and glucagon regulates the glucose level in blood. Adrenocorticotropic hormone (ACTH) is a hormone that stimulates the production of cortisol.

Topic: Biology, Chemical Coordination and Integration, NEET, NEET 2006
Which hormone inhibits gastric secretion and motility?

Options:
A Atrial natriuretic factor (ANF)
B Erythropoietin
C Cholecystokinin (CCK)
D Gastric inhibitory peptide (GIP)

The correct answer is:
Gastric inhibitory peptide (GIP)

Solution:
Gastric inhibitory peptide (GIP) inhibits gastric secretion and motility.

Topic: Biology, Chemical Coordination and Integration, NEET
Which hormone is inhibited by hypothalamic somatostatin?

Options:
A TSH
B GH
C ACTH
D ADH

The correct answer is:
GH

Solution:
Hypothalamus → Secretion of Somatostatin → Inhibition of release of Growth hormone (GH) from thepituitary gland.

Topic: Biology, Chemical Coordination and Integration, NEET
Which hormone is obtained from herring sperm DNA?

Options:
A Cytokinin
B Auxin
C giberlline
D Ethylene

The correct answer is:
Cytokinin

Solution:
Cytokinins are plant hormones that have specific effects on cytokinesis and cell division. These hormones were discovered as kinetin which was isolated from the autoclaved herring sperm DNA.

Topic: Biology, Plant - Growth and Development, NEET
Which hormone is produced by ovary in the second and third trimester of pregnancy?

Options:
A Relaxin
B Progesterone
C Estrogen
D hPL

The correct answer is:
Relaxin

Solution:
The placenta acts as an endocrine tissue and produces the following hormones :
A. Human chorionic gonadotropin (hCG)
B. Human placental lactogen (hPL)
C. Estrogens
D. Progestogens
The placenta is connected to the embryo through the umbilical cord.
The ovary produces relaxin hormone in the later phase of pregnancy.
Hormones produced in women only during pregnancy: hCG, hPL, and relaxin.
Hormones that are increased in concentration (by several folds) in maternal blood during pregnancy: Estrogens, progestogens, cortisol, prolactin, thyroxine, etc.

Topic: Biology, Human Reproduction, NEET
Which hormones do stimulate the production of pancreatic juice and bicarbonate?

Options:
A Angiotensin and epinephrine
B Gastrin and insulin
C Cholecystokinin and secretin
D Insulin and glucagon

The correct answer is:
Cholecystokinin and secretin

Solution:
Cholecystokinin and secretin both hormones increase the secretion of pancreatic juice. Cholecystokinin (CCK), formerly called pancreozymin, a digestive hormone is released with secretin when food from the stomach reaches the first part of the small intestine. The release of enzymes from the pancreas, an action ascribed to pancreozymin; and the contraction of the gallbladder, which forces bile into the duodenum, an action ascribed to cholecystokinin. Secretin is a hormone that regulates water homeostasis and influences the environment of the duodenum by regulating secretions in the stomach, pancreas, and liver.

Topic: Biology, Digestion and Absorption, NEET, NEET 2016 (Phase 2)
Which hybrid orbital is more electronegative?

Options:
A sp
B sp2
C sp3
D They all have the same electronegativity.

The correct answer is:
sp

Solution:
A carbon atom having an sp hybrid orbital with 50% s character is more electronegative than that possessing sp2 or sp3 hybridized orbitals.

Topic: Chemistry, General Organic Chemistry, NEET
Which hybrid orbitals are used by carbon atoms in the molecule CH3-CH2-OH?

Options:
A Both the carbons use sp3hybrid orbitals
B 2 sp3hybrid orbitals, 2 sp hybrid orbitals
C 2 sp3hybrid orbitals, 1sp hybrid orbital
D 2 sp3hybrid orbitals, 1 sp3d hybrid orbital

The correct answer is:
Both the carbons use sp3hybrid orbitals

Solution:
Correct Option is : (A)
Both the carbons use sp3hybrid orbitals

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which hybrid orbitals are used by carbon atoms in the molecule CH3-CH3?

Options:
A Both carbon atoms use sp hybrid orbitals
B Both carbon atoms use sp2hybrid orbitals
C Both carbon atoms use sp3hybrid orbitals
D Both carbon atoms use sp3d hybrid orbitals

The correct answer is:
Both carbon atoms use sp3hybrid orbitals

Solution:
Correct Option is : (C)
Both carbon atoms use sp3hybrid orbitals

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which hybrid orbitals are used by carbon atoms in the molecule CH3–CH=CH2?

Options:
A 2 sp3hybrid orbitals, 1 sp2hybrid orbital
B 1 sp3hybrid orbital, 2 sp2hybrid orbitals
C 3 sp hybrid orbitals, 1sp2hybrid orbitals
D 3 sp3hybrid orbitals, 3 sp2hybrid orbitals

The correct answer is:
1 sp3hybrid orbital, 2 sp2hybrid orbitals

Solution:
Correct Option is : (B)
1 sp3hybrid orbital, 2 sp2hybrid orbitals

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which hybrid orbitals are used by carbon atoms in the molecule CH3-CHO?

Options:
A Both the carbons use sp3hybrid orbitals
B 1 sp3hybrid orbital, 1 sp hybrid orbital
C 1 sp3hybrid orbital, 1 sp2hybrid orbital
D Both the carbons use sp2hybrid orbitals

The correct answer is:
1 sp3hybrid orbital, 1 sp2hybrid orbital

Solution:
Correct Option is : (C)
1 sp3hybrid orbital, 1 sp2hybrid orbital

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which hybrid orbitals are used by carbon atoms in the molecule CH3-COOH?

Options:
A Both the carbons use sp2hybrid orbitals
B 1 sp hybrid orbital, 1 sp3hybrid orbital
C Both the carbons use sp hybrid orbitals
D 1 sp3hybrid orbital, 1 sp2hybrid orbital

The correct answer is:
1 sp3hybrid orbital, 1 sp2hybrid orbital

Solution:
Correct Option is : (D)
1 sp3hybrid orbital, 1 sp2hybrid orbital

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which hydride of group 2 exist

Options:
A BeH2
B MgH2
C CaH2
D SrH2

The correct answer is:
CaH2

Solution:
Correct Option is : 3
CaH2

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which hydride, such as lithium hydride (LiH), is rather unreactive at moderate temperatures with oxygen (O2) or chlorine (Cl2)?

Options:
A Sodium hydride (NaH)
B Beryllium hydride (BeH2)
C Lithium hydride (LiH)
D Calcium hydride (CaH2)

The correct answer is:
Lithium hydride (LiH)

Solution:
Lithium hydride (LiH) is rather unreactive at moderate temperatures with oxygen (O2) or chlorine (Cl2) and is used in the synthesis of other useful hydrides.

Topic: Chemistry, Hydrogen, NEET
Which hydrogen halide adds to alkenes most selectively to form alkyl halides?

Options:
A HCl
B HBr
C HI
D They all add selectively.

The correct answer is:
HI

Solution:
HI adds most selectively to alkenes to form alkyl halides. This is due to the high reactivity of HI, which leads to a more selective addition reaction compared to HBr and HCl.

Topic: Chemistry, Hydrocarbons, NEET
Which hydrogen halide adds to alkenes to form alkyl halides with the highest regioselectivity?

Options:
A HCl
B HBr
C HI
D They all have the same regioselectivity.

The correct answer is:
HI

Solution:
HI adds to alkenes with the highest regioselectivity, leading to a more selective addition reaction compared to HBr and HCl, which may result in different products depending on the alkene's structure.

Topic: Chemistry, Hydrocarbons, NEET
Which hydrogen halide forms alkyl halides most rapidly when added to alkenes?

Options:
A HCl
B HBr
C HI
D They all react at the same rate.

The correct answer is:
HI

Solution:
HI forms alkyl halides most rapidly when added to alkenes. It is the fastest reacting hydrogen halide due to its high reactivity.

Topic: Chemistry, Hydrocarbons, NEET
Which hydrogen halide forms the least stable hydrohalic acid among HF, HCl, HBr, and HI?

Options:
A HF
B HCl
C HBr
D HI

The correct answer is:
HI

Solution:
The stability of hydrohalic acids decreases down the group: HF < HCl < HBr < HI.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which hydrogen halide forms the most polarized electrophile during the addition to alkenes?

Options:
A HCl
B HBr
C HI
D They all form equally polarized electrophiles.

The correct answer is:
HI

Solution:
HI forms the most polarized electrophile during the addition to alkenes due to the larger size and higher polarizability of iodine, making it highly polarized.

Topic: Chemistry, Hydrocarbons, NEET
Which hydrogen halide forms the most stable alkyl halides when added to alkenes?

Options:
A HCl
B HBr
C HI
D They all form equally stable alkyl halides.

The correct answer is:
HBr

Solution:
HBr forms the most stable alkyl halides when added to alkenes. The greater stability is due to the larger size of bromine compared to chlorine, leading to a more stable product.

Topic: Chemistry, Hydrocarbons, NEET
Which hydrogen halide is least reactive in the addition to alkenes?

Options:
A HCl
B HBr
C HI
D They all have the same reactivity.

The correct answer is:
HCl

Solution:
Among hydrogen halides, HCl is the least reactive in the addition to alkenes. It is less reactive than HBr and HI due to the smaller size and lower polarizability of chlorine.

Topic: Chemistry, Hydrocarbons, NEET
Which hydrogen halide is the most reactive in cleaving ethers?

Options:
A HCl
B HBr
C HI
D HF

The correct answer is:
HI

Solution:
Among the given options, HI is the most reactive hydrogen halide for cleaving ethers, as stated in the passage.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which hydrogen halide is the most reactive in the addition to alkenes?

Options:
A HCl
B HBr
C HI
D They all react equally.

The correct answer is:
HI

Solution:
The order of reactivity of hydrogen halides in the addition to alkenes is HI > HBr > HCl. HI is the most reactive among them due to the larger size and higher polarizability of iodine, making it a strong electrophile in the addition reaction.

Topic: Chemistry, Hydrocarbons, NEET
Which hydrogen isotope is mentioned to emit low-energy β– particles?

Options:
A Protium
B Deuterium
C Tritium
D All of the above

The correct answer is:
Tritium

Solution:
The paragraph mentions that tritium is the hydrogen isotope that emits low-energy β– particles.

Topic: Chemistry, Hydrogen, NEET
Which if the following is not applicable for Bt-cotton?

Options:
A It is a GM plant.
B It shows insect resistance.
C It has a bacterial gene expressing in its system.
D It is resistant to all pesticides.

The correct answer is:
It is resistant to all pesticides.

Solution:
Bt cotton is a genetically modified plant where a bacterial origin Bt toxin producing gene is inserted into the plant genome. This modification make the plant resistant against a variety of insect as the toxin is insecticidal.

Topic: Biology, Biotechnology and Its Applications, NEET