datavorous/entrance-exam-dataset huggingface dataset:
What is the chemistry of Lassaigne’s test?

Options:
A Lassaigne's test is a method for the detection of the presence of hydrogen ions (H+) in a given substance. It involves the reaction of the test substance with sodium metal [NA] to form sodium hydride (NaH), which is then treated with water (H2O) to produce hydrogen gas (H2). The evolved hydrogen gas is confirmed using a gas test.
B Lassaigne's test is a qualitative test used to detect the presence of halogens (chlorine, bromine, and iodine) and nitrogen in organic compounds. The test involves fusing the organic compound with sodium metal [NA] to form sodium cyanide (NaCN) and sodium halides (NaX), where X represents a halogen. The fused mass is then dissolved in water, and the resulting solution is acidified with dilute nitric acid (HNO3) to liberate the respective halogen acids (HX). These liberated halogen acids are identified using specific chemical tests.
C Lassaigne's test is a procedure for determining the presence of metals in a given sample. It involves heating the sample with sodium metal [NA] to form sodium compounds of the metals present. The resulting mixture is then extracted with water to dissolve the sodium compounds. The aqueous solution is acidified with dilute sulphuric acid (H2SO4) to precipitate the metal sulfides, which can be identified by their characteristic colours.
D Lassaigne's test is a method for determining the presence of carbonate ions (CO32-) in a given substance. It involves the reaction of the test substance with sodium metal [NA] to form sodium carbonate (Na2CO3). The resulting sodium carbonate is then acidified with hydrochloric acid (HCl) to produce carbon dioxide gas (CO2), which is confirmed using a gas test.

The correct answer is:
Lassaigne's test is a qualitative test used to detect the presence of halogens (chlorine, bromine, and iodine) and nitrogen in organic compounds. The test involves fusing the organic compound with sodium metal [NA] to form sodium cyanide (NaCN) and sodium halides (NaX), where X represents a halogen. The fused mass is then dissolved in water, and the resulting solution is acidified with dilute nitric acid (HNO3) to liberate the respective halogen acids (HX). These liberated halogen acids are identified using specific chemical tests.

Solution:
Correct Option is : (B)
Lassaigne's test is a qualitative test used to detect the presence of halogens (chlorine, bromine, and iodine) and nitrogen in organic compounds. The test involves fusing the organic compound with sodium metal [NA] to form sodium cyanide (NaCN) and sodium halides (NaX), where X represents a halogen. The fused mass is then dissolved in water, and the resulting solution is acidified with dilute nitric acid (HNO3) to liberate the respective halogen acids (HX). These liberated halogen acids are identified using specific chemical tests.

Topic: Chemistry, General Organic Chemistry, NEET
What is the chromosomal theory of inheritance?

Options:
A The genes regulating the characters are found in pairs
B The genes regulating the characters are found on chromosomes
C The genes regulating the characters assort independently
D The genes regulating the characters show incomplete dominance

The correct answer is:
The genes regulating the characters are found on chromosomes

Solution:
The chromosomal theory of inheritance states that the genes regulating the characters are located on the chromosomes, and the principles of inheritance are related to the behaviour of chromosomes during cell division.

Topic: Biology, Principles of Inheritance and Variation, NEET
What is the chromosome pattern in a human female?

Options:
A XY
B XO
C XX
D YY

The correct answer is:
XX

Solution:
The chromosome pattern in a human female is XX.

Topic: Biology, Human Reproduction, NEET
What is the chromosome pattern in a human male?

Options:
A XY
B XO
C XX
D YY

The correct answer is:
XY

Solution:
The chromosome pattern in a human male is XY.

Topic: Biology, Human Reproduction, NEET
What is the class to which ectoparasites belong?

Options:
A Cyclostomata
B Chondrichthyes
C Petromyzon
D Myxine

The correct answer is:
Cyclostomata

Solution:
All living members of the class Cyclostomata are ectoparasites on some fishes.

Topic: Biology, Animal Kingdom, NEET
What is the classification considered the most useful for medicinal chemists?

Options:
A Classification based on color
B Classification based on taste
C Classification based on source of origin
D Classification based on molecular targets

The correct answer is:
Classification based on molecular targets

Solution:
The classification based on molecular targets is the most useful classification for medicinal chemists.

Topic: Chemistry, Chemistry in Everyday Life, NEET
What is the classification for a jellyfish?

Options:
A Kingdom: Plantae
B Phylum: Cnidaria
C Class: Mammalia
D Order: Poales

The correct answer is:
Phylum: Cnidaria

Solution:
A jellyfish is classified as a cnidaria.

Topic: Biology, Animal Kingdom, NEET
What is the classification for a shark?

Options:
A Kingdom: Animalia
B Phylum: Chordata
C Class: Fish
D All of the above

The correct answer is:
All of the above

Solution:
A shark is classified as a fish (Phylum: Chordata, Class: Fish) and as a Selachimorpha (Order: Selachimorpha).

Topic: Biology, Animal Kingdom, NEET
What is the classification for a squid?

Options:
A Kingdom: Animalia
B Phylum: Mollusca
C Class: Cephalopoda
D All of the above

The correct answer is:
All of the above

Solution:
A squid is classified as a mollusk (Phylum: Mollusca) and as a cephalopod (Class: Cephalopoda).

Topic: Biology, Animal Kingdom, NEET
What is the classification for a starfish?

Options:
A Kingdom: Animalia
B Phylum: Echinodermata
C Class: Asteroidea
D All of the above

The correct answer is:
All of the above

Solution:
A starfish is classified as an echinoderm (Phylum: Echinodermata) and as an asteroidea (Class: Asteroidea).

Topic: Biology, Animal Kingdom, NEET
What is the classification of alkali metals based on their density?

Options:
A Heavy, Medium, Light
B Dense, Less Dense, Least Dense
C High Density, Moderate Density, Low Density
D None of the above

The correct answer is:
High Density, Moderate Density, Low Density

Solution:
Alkali metals are classified based on their density, with a trend of high density (Li), moderate density (Na), and low density (K, Rb, Cs) as you move down the group.

Topic: Chemistry, Environmental Chemistry, NEET
What is the classification of alkali metals based on their density?

Options:
A Heavy, Medium, Light
B Dense, Less Dense, Least Dense
C High Density, Moderate Density, Low Density
D None of the above

The correct answer is:
High Density, Moderate Density, Low Density

Solution:
Alkali metals are classified based on their density, with potassium being lighter than sodium, resulting in a trend of high density (Li), moderate density (Na), and low density (K, Rb, Cs) as you move down the group.

Topic: Chemistry, s Block Elements, NEET
What is the classification of carbohydrates based on their behavior on hydrolysis?

Options:
A Monosaccharides, Oligosaccharides, Polysaccharides
B Aldehydes, Ketones, Alcohols
C Sugars, Starches, Fats
D Acids, Bases, Salts

The correct answer is:
Monosaccharides, Oligosaccharides, Polysaccharides

Solution:
The classification of carbohydrates based on their behavior on hydrolysis is into three groups: monosaccharides, oligosaccharides, and polysaccharides.

Topic: Chemistry, s Block Elements, NEET
What is the classification of carbohydrates based on their behavior on hydrolysis?

Options:
A Monosaccharides, Oligosaccharides, Polysaccharides
B Aldehydes, Ketones, Alcohols
C Sugars, Starches, Fats
D Acids, Bases, Salts

The correct answer is:
Monosaccharides, Oligosaccharides, Polysaccharides

Solution:
The classification of carbohydrates based on their behavior on hydrolysis is into three groups: monosaccharides, oligosaccharides, and polysaccharides.

Topic: Chemistry, Biomolecules, NEET
What is the classification of compounds with the same molecular formula but different structures?

Options:
A Stereoisomers
B Structural isomers
C Homologous compounds
D Polymeric compounds

The correct answer is:
Structural isomers

Solution:
Compounds with the same molecular formula but different structures are classified as structural isomers.

Topic: Chemistry, General Organic Chemistry, NEET
What is the classification of germanium within group 14?

Options:
A Non-metal
B Metal
C Metalloid
D Noble gas

The correct answer is:
Metalloid

Solution:
Germanium as a metalloid.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
What is the classification of oxygen and sulphur in terms of their metallic properties?

Options:
A Oxygen is a metal, and sulphur is a metalloid
B Oxygen and sulphur are both non-metals
C Oxygen and sulphur are both metals
D Oxygen is a non-metal, and sulphur is a metalloid

The correct answer is:
Oxygen and sulphur are both non-metals

Solution:
The paragraph classifies both oxygen and sulphur as non-metals.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
What is the classification of satellite DNA based on?

Options:
A Repetitive unit length
B Base composition
C Both a and b
D Gene function

The correct answer is:
Both a and b

Solution:
Satellite DNA is classified based on its repetitive unit length, as well as its base composition (such as being A:T rich or G:C rich).

Topic: Biology, Molecular Basis of Inheritance, NEET
What is the coefficient of static friction between the block and the surface when a mass of 4 kg rests on a horizontal plane and the plane is gradually inclined until it reaches an angle θ = 15° with the horizontal, at which point the mass just begins to slide?

Options:
A 0.267
B 0.500
C 0.577
D 1.732

The correct answer is:
0.267

Solution:
Correct Option is : (A)
0.267

Topic: Chemistry, Laws of Motion, NEET
What is the coefficient of viscosity of the liquid in this scenario where a metal block of area 0.10 m² is connected to a 0.010 kg mass via a string passing over an ideal pulley, and a liquid with a film thickness of 0.30 mm is placed between the block and the table, causing the block to move to the right at a constant speed of 0.085 m/s?

Options:
A 3.46 × ${{10}^{-1}}$ $Pa~s$
B 3.46 × ${{10}^{-3}}$ $Pa~s$
C 3.46 × ${{10}^{-4}}$ $Pa~s$
D 3.46 × ${{10}^{-2}}$ $Pa~s$

The correct answer is:
3.46 × ${{10}^{-3}}$ $Pa~s$

Solution:
Correct Option is : (B)
3.46 × ${{10}^{-3}}$ $Pa~s$

Topic: Chemistry, Mechanical Properties of Fluids, NEET
What is the coefficient that relates the increase in temperature to the heat transferred to a system?

Options:
A Heat capacity
B Specific heat
C Molar heat capacity
D Heat change factor

The correct answer is:
Specific heat

Solution:
Specific heat is the coefficient that relates the increase in temperature (∆T) to the heat transferred (q) to a system.

Topic: Chemistry, Thermodynamics (C), NEET
What is the collective term for "habitat loss and fragmentation, over-exploitation, invasion of alien species and co-extinction"?

Options:
A Evil Quartet
B Four major causes of increasing biodiversity
C Spore tetrad
D Tetrasporic loss of biodiversity

The correct answer is:
Evil Quartet

Solution:
The accelerated rates of species extinctions that the world is facing now are largely due to human activities. There are four major causes ('The Evil Quartet' is the sobriquet used to describe them). In general, loss of biodiversity in a region may lead to a decline in plant production, b lowered resistance to environmental perturbations such as drought and c increased variability in certain ecosystem processes such as plant productivity, water use, and pest and disease cycles.

Topic: Biology, Biodiversity and its Conservation, NEET
What is the colloidal nature of soils responsible for?

Options:
A Formation of rocks
B Adsorption of moisture and nourishing materials
C Formation of deserts
D Erosion of land

The correct answer is:
Adsorption of moisture and nourishing materials

Solution:
The colloidal nature of soils is responsible for the adsorption of moisture and nourishing materials.

Topic: Chemistry, Surface Chemistry, NEET
What is the color change observed during the iodometry endpoint?

Options:
A Red to blue
B Yellow to brown
C Colorless to pink
D Blue to colorless

The correct answer is:
Blue to colorless

Solution:
The intense blue color formed due to the complex between iodine and starch disappears when all the iodine is consumed by thiosulfate ions, resulting in a colorless solution.

Topic: Chemistry, Redox Reactions, NEET
What is the color change observed when benzene undergoes nitration?

Options:
A Colorless to yellow
B Colorless to red
C Colorless to green
D Colorless to blue

The correct answer is:
Colorless to red

Solution:
Benzene changes color from colorless to red during the nitration process due to the formation of a colored intermediate compound.

Topic: Chemistry, Hydrocarbons, NEET
What is the color change observed when bromine is added to an alkene in CCl4?

Options:
A From colorless to reddish-brown.
B From reddish-brown to colorless.
C From colorless to colorless.
D From red to blue.

The correct answer is:
From reddish-brown to colorless.

Solution:
The addition of bromine results in the discharge of the reddish-brown color of bromine, indicating a color change from reddish-brown to colorless.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
What is the color of AgCl formed when ammonia reacts with Ag+ ions?

Options:
A Blue
B Green
C Colorless
D Yellow

The correct answer is:
Colorless

Solution:
The paragraph mentions that AgCl formed when ammonia reacts with Ag+ ions is colorless.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
What is the color of aluminum?

Options:
A Silvery-white
B Gold
C Black
D Red

The correct answer is:
Silvery-white

Solution:
Aluminum Is a bright silvery-white metal.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
What is the color of boron?

Options:
A White
B Red
C Black
D Blue

The correct answer is:
Black

Solution:
Boron is a "black-colored solid."

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
What is the color of bromine?

Options:
A Yellow
B Greenish yellow
C Red
D Violet

The correct answer is:
Red

Solution:
Bromine is red in color.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
What is the color of Cu2+ when it is in the 3d9 state?

Options:
A Blue
B Green
C Pink
D Yellow

The correct answer is:
Blue

Solution:
Cu2+ in the 3d9 state is blue.

Topic: Chemistry, d and f Block Elements, NEET
What is the color of diborane?

Options:
A Colorless
B Yellow
C Green
D Red

The correct answer is:
Colorless

Solution:
Diborane is colorless.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
What is the color of fluorine gas?

Options:
A Yellow
B Greenish yellow
C Red
D Violet

The correct answer is:
Yellow

Solution:
Fluorine gas is yellow in color.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
What is the color of K2Cr2O7
before it undergoes reduction in a titration?

Options:
A Yellow
B Blue
C Pink
D Colorless

The correct answer is:
Yellow

Solution:
K2Cr2O7

Topic: Chemistry, Redox Reactions, NEET
What is the color of Ni2+ when it is in the 3d8 state?

Options:
A Green
B Blue
C Pink
D Yellow

The correct answer is:
Green

Solution:
Ni2+ in the 3d8 state is green.

Topic: Chemistry, d and f Block Elements, NEET
What is the color of PCl5?

Options:
A Colorless
B Yellowish white
C Yellow
D White

The correct answer is:
Yellowish white

Solution:
The paragraph mentions that PCl5 is a yellowish white powder.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
What is the color of phosphine (PH3) gas?

Options:
A Blue
B Colorless
C Red
D Green

The correct answer is:
Colorless

Solution:
The paragraph describes phosphine as a colorless gas.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
What is the color of phosphorus trichloride (PCl3)?

Options:
A Colorless
B Red
C Yellow
D Blue

The correct answer is:
Colorless

Solution:
The paragraph does not specify the color of phosphorus trichloride, but it is typically a colorless oily liquid.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
What is the color of potassium permanganate crystals?

Options:
A Dark green
B Dark purple (almost black)
C Bright red
D Pale yellow

The correct answer is:
Dark purple (almost black)

Solution:
Potassium permanganate forms dark purple (almost black) crystals.

Topic: Chemistry, d and f Block Elements, NEET
What is the color of pure alkyl halides?

Options:
A Colorless
B Yellow
C Red
D Green

The correct answer is:
Colorless

Solution:
Alkyl halides are colorless when pure.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
What is the color of starch-I2?

Options:
A Red
B Blue
C Green
D Yellow

The correct answer is:
Blue

Solution:
The starch-I2 is blue in color.

Topic: Biology, Biomolecules (B), NEET
What is the color of the complex [CoCl(NH3)6]2+2Cl–?

Options:
A Yellow
B Purple
C Green
D Violet

The correct answer is:
Purple

Solution:
According to the information in the table, the complex [CoCl(NH3)6]2+2Cl– is purple in color.

Topic: Chemistry, Coordination Compounds, NEET
What is the color of the complex compound formed when ammonia reacts with Cu2+ ions?

Options:
A Deep blue
B Red
C Green
D Yellow

The correct answer is:
Deep blue

Solution:
The paragraph mentions that the complex compound formed when ammonia reacts with Cu2+ ions is deep blue.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
What is the color of the compound formed when ammonia reacts with Ag+ ions to form AgCl?

Options:
A Blue
B Green
C Colorless
D Red

The correct answer is:
Colorless

Solution:
The paragraph mentions that AgCl formed when ammonia reacts with Ag+ ions is colorless.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
What is the color of Ti3+ when it is in the 3d1 state?

Options:
A Purple
B Blue
C Green
D Violet

The correct answer is:
Purple

Solution:
Ti3+ in the 3d1 state is purple.

Topic: Chemistry, d and f Block Elements, NEET
What is the color of V2+ when it is in the 3d3 state?

Options:
A Green
B Violet
C Blue
D Pink

The correct answer is:
Violet

Solution:
V2+ in the 3d3 state is Violet.

Topic: Chemistry, d and f Block Elements, NEET
What is the color of white phosphorus?

Options:
A Red
B Black
C Transparent
D Translucent white

The correct answer is:
Translucent white

Solution:
The paragraph describes white phosphorus as a translucent white waxy solid.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
What is the color of zinc dust used in the reduction process of phenol to benzene?

Options:
A Silver
B Brown
C Black
D Red

The correct answer is:
Silver

Solution:
Zinc dust used in the reduction process of phenol to benzene is typically silver in color.

Topic: Chemistry, Hydrocarbons, NEET
What is the colour change observed during a positive Tollens' test?

Options:
A Yellow to red
B Colourless to green
C Silver to gold
D Colourless to silver

The correct answer is:
Colourless to silver

Solution:
A positive Tollens' test involves a colour change from colourless to the appearance of a silver mirror.

Topic: Chemistry, Aldehydes, Ketones and Carboxylic Acids, NEET
What is the colour of Fe3+?

Options:
A Blue
B Yellow
C Colourless
D Green

The correct answer is:
Yellow

Solution:
Correct Option is : 2
Yellow

Topic: Chemistry, d and f Block Elements, NEET
What is the colour of IF3?

Options:
A Orange
B Red
C Brown
D yellow

The correct answer is:
yellow

Solution:
Correct Option is : 4
yellow

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
What is the colour of Ni2+?

Options:
A Green
B Violet
C Yellow
D Blue

The correct answer is:
Green

Solution:
Correct Option is : 1
Green

Topic: Chemistry, d and f Block Elements, NEET
What is the colour of the plasma?

Options:
A Green
B Blue
C Yellow
D Straw coloured

The correct answer is:
Straw coloured

Solution:
Plasma, a part of the blood, is a straw colored, viscous fluid constituting nearly 55% of the blood.

Topic: Biology, Body Fluids and Circulation, NEET
What is the colour of Ti+4?

Options:
A Blue
B Green
C Colourless
D Pink

The correct answer is:
Colourless

Solution:
Correct Option is : 3
Colourless

Topic: Chemistry, d and f Block Elements, NEET
What is the combination of an npn transistor?

Options:
A Three layers of n-type semiconductors
B One layer of n-type and one layer of p-type semiconductor
C Two layers of n-type semiconductors and one layer of p-type semiconductor
D Two layers of p-type semiconductors and one layer of n-type semiconductor

The correct answer is:
Two layers of n-type semiconductors and one layer of p-type semiconductor

Solution:
An npn transistor is made by combining two layers of n-type semiconductors with one layer of p-type semiconductor.

Topic: Chemistry, Solid State, NEET
What is the combination of two layers of opposite charges around the colloidal particle called?

Options:
A Electrokinetic potential
B Zeta potential
C Helmholtz electrical double layer
D Van der Waals forces

The correct answer is:
Helmholtz electrical double layer

Solution:
The paragraph states that the combination of the two layers of opposite charges around the colloidal particle is called the Helmholtz electrical double layer.

Topic: Chemistry, Surface Chemistry, NEET
What is the combined number of 3d electrons in Ti2+, V2+, Cr3+, Mn2+, Fe2+, Fe3+, Co2+, Ni2+and Cu2+all at once?

Options:
A 46
B 48
C 50
D 52

The correct answer is:
48

Solution:
Correct Option is : (B)
48

Topic: Chemistry, d and f Block Elements, NEET
What is the commercial meaning of a 30% solution of hydrogen peroxide?

Options:
A It contains 3%H2O2.
B It contains 10%H2O2.
C It contains 30%H2O2.
D It contains 100% H2O2.

The correct answer is:
It contains 3%H2O2.

Solution:
A 30% solution of hydrogen peroxide contains 3% H2O2.

Topic: Chemistry, Hydrogen, NEET
What is the commercial name for sodium hexametaphosphate used in water treatment?

Options:
A Sodium chloride
B Sodium carbonate
C Sodium hydroxide
D Calgon

The correct answer is:
Calgon

Solution:
Sodium hexametaphosphate is commercially known as "Calgon" when used in water treatment.

Topic: Chemistry, Hydrogen, NEET
What is the common antiseptic mixture that includes chloroxylenol and terpineol?

Options:
A Iodoform
B Dettol
C Bithionol
D Tincture of iodine

The correct answer is:
Dettol

Solution:
Dettol is a common antiseptic mixture consisting of chloroxylenol and terpineol.

Topic: Chemistry, Chemistry in Everyday Life, NEET
What is the common application of liquid ammonia?

Options:
A As a household cleaner
B As a food preservative
C As a refrigerant
D As a pesticide

The correct answer is:
As a refrigerant

Solution:
The paragraph mentions that liquid ammonia is used as a refrigerant.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
What is the common chamber where the alimentary canal, urinary and reproductive tracts open in amphibians?

Options:
A Tympanum
B Cloaca
C Auricles
D Ventricle

The correct answer is:
Cloaca

Solution:
The alimentary canal, urinary and reproductive tracts open into a common chamber called cloaca which opens to the exterior in amphibians.

Topic: Biology, Animal Kingdom, NEET
What is the common characteristic of many volatile halogen compounds?

Options:
A They are odorless.
B They have a pungent smell.
C They have a sweet smell.
D They have a bitter taste.

The correct answer is:
They have a sweet smell.

Solution:
Many volatile halogen compounds have a sweet smell.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
What is the common characteristic of the solvent in solutions of liquids in liquids?

Options:
A It is always a gas.
B It is generally volatile.
C It is non-volatile.
D It is highly viscous.

The correct answer is:
It is generally volatile.

Solution:
The paragraph mentions that generally, the liquid solvent in solutions of liquids in liquids is volatile.

Topic: Chemistry, Solutions, NEET