datavorous/entrance-exam-dataset huggingface dataset:
Which class of drugs do these belong to?

Options:
A Analgesics
B Antacid
C Antiseptics
D Antihistamines

The correct answer is:
Antiseptics

Solution:
Correct Option is : 3
Antiseptics

Topic: Chemistry, Chemistry in Everyday Life, NEET
Which class of drugs is used in sleeping pills?

Options:
A Antihistamines
B Antacids
C Tranquilizers
D Antiseptics

The correct answer is:
Tranquilizers

Solution:
Correct Option is : (C)
Tranquilizers

Topic: Chemistry, Chemistry in Everyday Life, NEET
Which class of metals is specifically mentioned as reacting with dihydrogen to form hydrides?

Options:
A Transition metals
B Noble metals
C Alkali metals
D Lanthanides

The correct answer is:
Alkali metals

Solution:
The paragraph specifically mentions that dihydrogen reacts with metals, specifically alkali metals, to form hydrides.

Topic: Chemistry, Hydrogen, NEET
Which class of pollutants includes heavy metals like cadmium and mercury?

Options:
A Pathogens
B Organic wastes
C Chemical pollutants
D Sediments

The correct answer is:
Chemical pollutants

Solution:
Chemical pollutants include water-soluble inorganic chemicals, such as heavy metals like cadmium, mercury, and nickel.

Topic: Chemistry, Environmental Chemistry, NEET
Which class of polymer is Buna-S?

Options:
A Co-polymer
B Cross-linked polymer
C Condensation polymer
D Homopolymers

The correct answer is:
Co-polymer

Solution:
The mode of polymerisation is classified into:
I. Addition polymers: Polymers are formed by the repeated addition of monomers with double and triple bonds. It is further classified into,
a. Homopolymers:Polymers formed by the polymerisation of a single monomeric species. Examples – Polythene, Polystyrene.
b. Co-polymers:Polymers formed by addition polymerisation of two different monomers. Examples – Buna-S, Buna –N.
II. Condensation polymers: Polymers formed by repeated condensation reaction between two different bi-functional or tri-functional monomeric units with elimination of simple molecules. Examples – Nylon 6, 6, Nylon 6.

Topic: Chemistry, Polymers, NEET
Which class of pteridophytes does Equisetum belong to?

Options:
A Psilopsida
B Lycopsida
C Sphenopsida
D Pteropsida

The correct answer is:
Sphenopsida

Solution:
The pteridophytes are further classified into four classes: Psilopsida (Psilotum); Lycopsida (Selaginella, Lycopodium), Sphenopsida (Equisetum) and Pteropsida (Dryopteris, Pteris, Adiantum).

Topic: Biology, Plant Kingdom, NEET
Which class of pteridophytes does Pteris belong to?

Options:
A Psilopsida
B Lycopsida
C Sphenopsida
D Pteropsida

The correct answer is:
Pteropsida

Solution:
The pteridophytes are further classified into four classes: Psilopsida (Psilotum); Lycopsida (Selaginella, Lycopodium), Sphenopsida (Equisetum) and Pteropsida (Dryopteris, Pteris, Adiantum).

Topic: Biology, Plant Kingdom, NEET
Which class of pteridophytes does Selaginella belong to?

Options:
A Psilopsida
B Lycopsida
C Sphenopsida
D Pteropsida

The correct answer is:
Lycopsida

Solution:
The pteridophytes are further classified into four classes: Psilopsida (Psilotum); Lycopsida (Selaginella, Lycopodium), Sphenopsida (Equisetum) and Pteropsida (Dryopteris, Pteris, Adiantum).

Topic: Biology, Plant Kingdom, NEET
Which classes of algae possess pigment fucoxanthin and pigment phycoerythrin, respectively?

Options:
A Chlorophyceae and Rhodophyceae
B Rhodophyceae and Phaeophyceae
C Phaeophyceae and Chlorophyceae
D Phaeophyceae and Rhodophyceae

The correct answer is:
Phaeophyceae and Rhodophyceae

Solution:
The prime pigment found in phaeophyceae that gives its members their characteristic colour is xanthophyll pigment, fucoxanthin.
The members of rhodophyceae are commonly called red algae because of the predominance of the red pigment, r-phycoerythrin in their body.

Topic: Biology, Plant Kingdom, NEET, NEET 2023 (Manipur)
Which classification system is used for animals?

Options:
A Linnaean
B Darwinian
C Mendelian
D Watson and Crick

The correct answer is:
Linnaean

Solution:
The Linnaean system is a classification system used for animals, in which organisms are grouped based on physical characteristics.

Topic: Biology, Animal Kingdom, NEET
Which codon has a dual function in the genetic code?

Options:
A UAA
B UAG
C UGA
D AUG

The correct answer is:
AUG

Solution:
AUG codes for Methionine and it also acts as an initiator codon.

Topic: Biology, Molecular Basis of Inheritance, NEET
Which colour is emitted by cesium during flame test?

Options:
A Green
B Blue
C Yellow
D Red violet

The correct answer is:
Blue

Solution:
Correct Option is : 2
Blue

Topic: Chemistry, s Block Elements, NEET
Which colour is emitted by Rubidium during flame test?

Options:
A Violet
B Crimson red
C Red violet
D Blue

The correct answer is:
Red violet

Solution:
Correct Option is : 3
Red violet

Topic: Chemistry, s Block Elements, NEET
Which colour of the light has the longest wavelength?

Options:
A red
B blue
C green
D violet

The correct answer is:
red

Solution:
Among the given lights, red coloured light has the longest wavelength.

As wavelength increases from V to R in VIBGYOR. So, red colour has the largest wavelength. It is reverse of frequency.Violet has the shortest wavelength.

Topic: Physics, Electromagnetic Waves, NEET, NEET 2019 (All India)
Which colourless gas have the smell of rotten fish?

Options:
A H2S
B PH3
C SO2
D None of these

The correct answer is:
PH3

Solution:
H2S→ colourless gas with unpleasant odour of rotten eggs.
SO2→ colourless gas with a pungent suffocating odour
PH3→ colourless gas with unpleasant garlic like odour or rotten fish odour.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which combination cannot be used for the preparation of hydrogen gas in the laboratory?
I. Zinc/conc. H2SO4
II. Zinc/dil. HNO3
III. Pure Zinc/dil. H2SO4

Options:
A I and II
B I, II and III
C III only
D I and III

The correct answer is:
I, II and III

Solution:
I. Zinc and conc. H2SO4 gives SO2
II. Zinc and dil. HNO3 gives NH4NO3 .
III. The reaction with pure zinc and dil. H2SO4 is very slow.

Topic: Chemistry, s Block Elements, NEET
Which combination from the option fill up the blank spaces a, b, c and d correctly in the table below?

Type of microbe	Scientific Name	Commercial Product

(i)	Bacterium	a	Clot buster enzyme

(ii)	b	Aspergillus niger	Citric acid

(iii)	Fungus	Monascus purpureus	c

(iv)	Bacterium	d	Butyric acid

Options:
A

a	b	c	d

Lactobacillus	Fungus	Strain	Penicillium roquefortii

B

a	b	c	d

Streptococcus	Fungus	Strain	Clostridium butylicum

C

a	b	c	d

Streptococcus	Bacteria	Cyclosporin	Clostridium butylicum

D

a	b	c	d

Lactobacillus	Fungus	Strain	Penicillium roquefortii

The correct answer is:

a	b	c	d

Streptococcus	Fungus	Strain	Clostridium butylicum

Solution:
Microbes are also used for commercial and industrial production of certain chemicals like organic acids, alcohols and enzymes. Examples of acid producers are Aspergillus niger (a fungus) of citric acid, Acetobacter aceti (a bacterium) of acetic acid; Clostridium butylicum (a bacterium) of butyric acid and Lactobacillus (a bacterium) of lactic acid. Streptokinase produced by the bacterium Streptococcus and modified by genetic engineering is used as a 'clot buster' for removing clots from the blood vessels of patients who have undergone myocardial infarction leading to a heart attack. Statins produced by the yeast Monascus purpureus have been commercialized as blood-cholesterol lowering agents. It acts by competitively inhibiting the enzyme responsible for the synthesis of cholesterol.

Topic: Biology, Microbes in Human Welfare, NEET
Which combination is correct for the pairing of Column I and II?

Column-I	Column-II

a	Î± -1-antitrypsin	(i)	Pig

b	Xenograft	(ii)	Emphysema

c	Rosie milk	(iii)	Human protein enriched

d	Toxicity testing	(iv)	More sensitive transgenic animals

Options:
A a-i,b-ii,c-iii, d-iv
B a-ii,b-i,c-iii,d-iv
C a-ii,b-iv,c-iii, d-i
D a-iv,b-ii,c-i,d-iii

The correct answer is:
a-ii,b-i,c-iii,d-iv

Solution:
α - 1 -antitrypsin is a protease inhibitor that helps protecting alveoli surrounding protein elastin from getting damage by elastase released by WBC. Its deficiency causes emphysema. Xenograft is a process where the graft donor and recipient belong to different organism group. Rosie is the first transgenic cow to produce milk that was enriched with human protein (human alpha lactalbumin). Transgenic animals are used for toxicity testing as they can be made more sensitive to obtain results at a quicker rate.

Topic: Biology, Biotechnology and Its Applications, NEET
Which combination of gases is suitable for fruit ripening?

Options:
A CO2 and C2H6
B CH4 and CO2​
C CO2 and O2​
D C2H4 and CO2​

The correct answer is:
C2H4 and CO2​

Solution:
Ethylene acts physiologically as a hormone in plants. It stimulates the ripening of fruit, the opening of flowers, and the abscission (or shedding) of leaves. Its biosynthesis starts from methionine with 1-arninocyclopropane-1-carboxylic acid (ACC) as a key intermediate.

Topic: Biology, Plant - Growth and Development, NEET
Which complex compound is most stable?

Options:
A CoNH362SO43
B CoNH34H2OBrNO32
C CoNH33NO33
D CoCl2en2NO3

The correct answer is:
CoCl2en2NO3

Solution:
Chelating ligands in general form more stable complexes than their monodentate analogs. When a chelating ligand binds to a metal ion, it forms a ring structure with the metal ion at the center. This ring structure increases the stability of the complex because it restricts the movement of the metal ion and prevents it from interacting with other molecules or ions. In addition, the chelating ligand can donate multiple electron pairs to the metal ion, which increases the strength of the metal-ligand bond and further stabilizes the complex.

∴ The most stable complex is CoCl2en2NO3

Topic: Chemistry, Coordination Compounds, NEET, NEET 2023 (All India)
Which complex in the following has the highest stability constant at 298 K?

Options:
A CdCl42-
B CdBr42-
C CdI42-
D CdCN42-

The correct answer is:
CdCN42-

Solution:
The cyano and ammine complexes are far more stable than those formed by halide ions. This is due to the fact that NH3 and CN- are strong lewis ligands.

Topic: Chemistry, Coordination Compounds, NEET
Which component of smog results from the action of sunlight on unsaturated hydrocarbons and nitrogen oxides?

Options:
A Smoke
B Fog
C Sulfur Dioxide
D Nitrogen Oxides

The correct answer is:
Nitrogen Oxides

Solution:
Nitrogen oxides produced by automobiles and factories, when acted upon by sunlight, are a key component of photochemical smog.

Topic: Chemistry, Environmental Chemistry, NEET
Which component of starch is branched?

Options:
A Cellulose
B Amylose
C Amylopectin
D Glucose

The correct answer is:
Amylopectin

Solution:
Amylopectin is a branched chain polymer.

Topic: Chemistry, Biomolecules, NEET
Which component of starch is insoluble in water?

Options:
A Cellulose
B Amylose
C Amylopectin
D Glucose

The correct answer is:
Amylopectin

Solution:
Amylopectin is insoluble in water.

Topic: Chemistry, Biomolecules, NEET
Which component of starch is water-soluble?

Options:
A Cellulose
B Amylose
C Amylopectin
D Glucose

The correct answer is:
Amylose

Solution:
Amylose is the water-soluble component of starch.

Topic: Chemistry, Biomolecules, NEET
Which component of the angular momentum (l) of a particle, moving solely in the x-y plane with position vector (r) having components x, y, z and momentum (p) having components px, py, and pz, is zero?

Options:
A The x-component
B The y-component
C The z-component
D None of the components are non-zero.

The correct answer is:
The z-component

Solution:
Correct Option is : (C)
The z-component

Topic: Chemistry, Rotational Motion, NEET
Which component of the cell is responsible for protein synthesis?

Options:
A Nucleus
B Mitochondria
C Ribosome
D Golgi apparatus

The correct answer is:
Ribosome

Solution:
Ribosomes are the cellular structures responsible for protein synthesis.

Topic: Chemistry, Biomolecules, NEET
Which compound amongst the following is not an aromatic compound?

Options:
A

B

C

D

The correct answer is:

Solution:
German chemist and physicist Erich Hückel proposed a theory to help determine if a planar ring molecule would have aromatic properties. His rule states that if a cyclic, planar molecule has 4n+2 π electrons, it is considered aromatic. This rule would come to be known as Hückel's Rule

In the above molecule,There is an sp3 hybridized carbon in the ring.Hence, it is not involved in conjugation. As delocalization of π electrons is not there throughout the ring.It is not an aromatic species.

It does not follow Huckel's rule.

But in the other options the species given that is ,andare aromatic as they obey Huckel's rule

Topic: Chemistry, General Organic Chemistry, NEET, NEET 2022 (Phase 1)
Which compound can be use to prepare Azo-dyes?

Options:
A Aniline
B Salicylic acid
C Benzaldehyde
D Chlorobenzene

The correct answer is:
Aniline

Solution:
When aniline is treated with HNO2 at 0–5°C then diazonium salt is formed and by the coupling of diazonium salt and phenol azo dyes are prepared.

Topic: Chemistry, Amines, NEET
Which compound can produce chloropicrin with Cl2,NaOH

Options:
A Nitromethane
B Nitrophenol
C Nitroethane
D Nitrostyrene

The correct answer is:
Nitromethane

Solution:
CH3NO2+Nitromethane3Cl2+3NaOH→CCl3-NO2(chloropicrin)+3NaCl+3H2O

Topic: Chemistry, Amines, NEET
Which compound does not form a hydrate?

Options:
A MgSO4
B CaSO4
C BaSO4
D SrSO4

The correct answer is:
BaSO4

Solution:
Among the options provided, BaSO4 does not form a hydrate.

Topic: Chemistry, s Block Elements, NEET
Which compound forms a hydrate among the following options?

Options:
A NaCl
B KCl
C MgCl2
D CaCl2

The correct answer is:
CaCl2

Solution:
Compounds of alkaline earth metals are more extensively hydrated compared to alkali metal compounds. MgCl2 and CaCl2 form hydrates, whereas NaCl and KCl do not.

Topic: Chemistry, s Block Elements, NEET
Which compound forms the basis for many gemstones like rubies and sapphires?

Options:
A Fe2O3
B Al2O3
C CO2
D SiO2

The correct answer is:
Al2O3

Solution:
Many gemstones are impure forms of aluminum oxide, denoted as Al2O3.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
Which compound, found in cinnamon, is known for its pleasant fragrance?

Options:
A Salicylaldehyde
B Cinnamaldehyde
C Vanillin
D Alkanal

The correct answer is:
Cinnamaldehyde

Solution:
Cinnamaldehyde, found in cinnamon, is known for its pleasant fragrance.

Topic: Chemistry, Aldehydes, Ketones and Carboxylic Acids, NEET
Which compound given is not a Lewis acid?

Options:
A BF3
B FeCl3
C AlCl3
D NH3

The correct answer is:
NH3

Solution:
Those species which are electron deficient and having vacant orbital are capable of excepting the electrons, known as lewis acid. Ammonia is not electron deficient and do not have vacant orbital, hence not a lewis acid.

Topic: Chemistry, Ionic Equilibrium, NEET
Which compound has electrovalent, covalent, co-ordinate as well as hydrogen bond?

Options:
A CuSO4.5H2O
B ZnSO4.7H2O
C FeSO4.7H2O
D FeCl3.6H2O

The correct answer is:
CuSO4.5H2O

Solution:
[Cu(H2O)4]SO4.H2O (Blue vitrol) has
(i) electrovalent bond between Cu2+ and SO42- ions
(ii) four water molecules are coordinated
(iii) One water molecule is hydrogen bonded to SO42- ions.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which compound has Highest boiling point?

Options:
A NH3
B CH3COCH3
C H2O
D NaCl

The correct answer is:
NaCl

Solution:
Correct Option is : 4
NaCl

Topic: Chemistry, Thermodynamics (C), NEET
Which compound has Highest enthalpy of fusion?

Options:
A C6H6
B NaCl
C CH3COCH3
D H2O

The correct answer is:
NaCl

Solution:
Correct Option is : 2
NaCl

Topic: Chemistry, Thermodynamics (C), NEET
Which compound has Highest enthalpy of vaporisation?

Options:
A NaCl
B CH3COCH3
C H2O
D NH3

The correct answer is:
NaCl

Solution:
Correct Option is : 1
NaCl

Topic: Chemistry, Thermodynamics (C), NEET
Which compound has Highest melting point?

Options:
A H2O
B C6H6
C CH3COCH3
D NaCl

The correct answer is:
NaCl

Solution:
Correct Option is : 4
NaCl

Topic: Chemistry, Thermodynamics (C), NEET
Which compound has Lowest boiling point?

Options:
A NaCl
B CO
C N2
D H2O

The correct answer is:
N2

Solution:
Correct Option is : 3
N2

Topic: Chemistry, Thermodynamics (C), NEET
Which compound has Lowest enthalpy of fusion?

Options:
A CCl4
B CO
C N2
D H2O

The correct answer is:
N2

Solution:
Correct Option is : 3
N2

Topic: Chemistry, Thermodynamics (C), NEET
Which compound has Lowest enthalpy of vaporisation?

Options:
A N2
B CO
C CCl4
D H2O

The correct answer is:
N2

Solution:
Correct Option is : 1
N2

Topic: Chemistry, Thermodynamics (C), NEET
Which compound has Lowest melting point?

Options:
A H2O
B CO
C N2
D NaCl

The correct answer is:
N2

Solution:
Correct Option is : 3
N2

Topic: Chemistry, Thermodynamics (C), NEET
Which compound has the same value of Van't Hoff factor i as that of K4[Fe(CN)6]

Options:
A Na2SO4
B NaCl
C Al2(SO4)3
D Al(NO3)3

The correct answer is:
Al2(SO4)3

Solution:
K4[Fe(CN)6] dissociates as 4K++[Fe(CN)6]4-, thus 1 molecule dissociates into five particles in the similar way Al2(SO4)3 also gives five particles per molecule.

Topic: Chemistry, Solutions, NEET
Which compound in each of the following pairs will react faster in SN2 reaction with –OH? (i) CH3Br or CH3I and (ii) (CH3)3CCl or CH3Cl

Options:
A (i) CH3Br and (ii) CH3Cl
B (i) CH3I and (ii) (CH3)3CCl
C (i) CH3I and (ii) CH3Cl
D (i) CH3Br and (ii) (CH3)3CCl

The correct answer is:
(i) CH3I and (ii) CH3Cl

Solution:
Correct Option is : (C)
(i) CH3I and (ii) CH3Cl

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which compound in the following can exhibits tautomerism?

Options:
A (CH3)CNO
B R3CNO2
C (CH3)2NH
D RCH2NO2

The correct answer is:
RCH2NO2

Solution:
Compounds containing α- hydrogen can undergo tautomerism,

Topic: Chemistry, General Organic Chemistry, NEET
Which compound is an example of an extensively hydrated alkaline earth metal compound?

Options:
A BaSO4
B CaSO4·2H2O
C MgSO4·7H2O
D SrSO4·4H2O

The correct answer is:
MgSO4·7H2O

Solution:
MgSO4·7H2O is an example of an extensively hydrated alkaline earth metal compound.

Topic: Chemistry, s Block Elements, NEET
Which compound is better written as (Na+)2S2-(s)?

Options:
A Sodium chloride
B Sodium oxide
C Sodium sulfide
D Sodium hydroxide

The correct answer is:
Sodium sulfide

Solution:
Sodium sulfide is better written as (Na+)2S2-(s).

Topic: Chemistry, Redox Reactions, NEET
Which compound is commonly formed when a primary alcohol is oxidised?

Options:
A Ketone
B Aldehyde
C Carboxylic acid
D Alkene

The correct answer is:
Aldehyde

Solution:
A primary alcohol is commonly oxidised to form an aldehyde.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which compound is extensively hydrated?

Options:
A Na2SO4
B MgSO4
C CaSO4
D SrSO4

The correct answer is:
MgSO4

Solution:
Among the options provided, MgSO4 is extensively hydrated.

Topic: Chemistry, s Block Elements, NEET
Which compound is formed when benzene undergoes chlorination in the presence of ultraviolet light?

Options:
A Benzene Hexachloride
B Benzene Tetrachloride
C Benzene Pentachloride
D Benzene Trichloride

The correct answer is:
Benzene Hexachloride

Solution:
Under ultraviolet light, benzene reacts with chlorine to produce benzene hexachloride, which is also known as gammaxane.

Topic: Chemistry, Hydrocarbons, NEET
Which compound is formed when chlorobenzene is heated with chloral in the presence of concentrated sulphuric acid?

Options:
A Freon
B Hexachloroethane
C Gammexene
D DDT

The correct answer is:
DDT

Solution:
DDT is prepared by heating chlorobenzene and chloral with concentrated sulphuric acid through electrophilic aromatic aromatic substitution.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which compound is formed when iron reacts with carbon?

Options:
A FeC2
B Fe3C
C FeC3
D Fe2C

The correct answer is:
Fe3C

Solution:
Transition elements form compounds of indefinite structures and properties and variable composition which are called Interstitial compounds which are non-stoichiometric compounds formed by the adsorption (penetration) of small, non-metallic atoms like H, B, C, N into the interstices of lattice of transition metals.
Interstitial compound Fe3C (cementite) is formed.

Topic: Chemistry, d and f Block Elements, NEET
Which compound is most widely used as an antifertility drug and is an example of a synthetic progesterone derivative?

Options:
A Estrogen
B Norethindrone
C Antibiotics
D Vitamins

The correct answer is:
Norethindrone

Solution:
Norethindrone is an example of a synthetic progesterone derivative and is widely used as an antifertility drug.

Topic: Chemistry, Chemistry in Everyday Life, NEET
Which compound is produced by acetylation of salicylic acid?

Options:
A Acetic acid
B Aspirin
C Acetone
D Acetaldehyde

The correct answer is:
Aspirin

Solution:
Acetylation of salicylic acid produces aspirin.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which compound is produced when fluorine reacts with water?

Options:
A HF and O3
B HF and O2
C HF and OF2
D HF,O2 and O3

The correct answer is:
HF,O2 and O3

Solution:
2F2+2H2O→4HF+O2
3F2+3H2O→6HF+O3

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which compound is represented as Au(I)Cl in Stock notation?

Options:
A Aurous chloride
B Auric chloride
C Stannous chloride
D Stannic chloride

The correct answer is:
Aurous chloride

Solution:
The passage provides the example of aurous chloride as Au(I)Cl in Stock notation.

Topic: Chemistry, Redox Reactions, NEET
Which compound is the most acidic of the following?

Options:
A C6H5COOH
B ClCH2COOH
C CD3COOH
D CH3CH2COOH

The correct answer is:
ClCH2COOH

Solution:
Any electron withdrawing substituent (having -I effect) stabilises the anion by dispersing the negative charge and therefore, increases the acidity. Chlorine is an electron withdrawing group.

Topic: Chemistry, General Organic Chemistry, NEET
Which compound is used as a reducing agent in organic synthesis and is derived from diborane?

Options:
A Boric acid
B Sodium borohydride
C Borax
D Boric oxide

The correct answer is:
Sodium borohydride

Solution:
Both lithium borohydride (LiBH4) and sodium borohydride (NaBH4) are derived from diborane and are used as reducing agents in organic synthesis.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Which compound is used as the reducing agent in hydroboration-oxidation?

Options:
A Borane
B Hydrogen peroxide
C Sodium hydroxide
D Diborane

The correct answer is:
Borane

Solution:
Borane is used as the reducing agent in the hydroboration step of hydroboration-oxidation.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which compound leads to the formation of blister copper?

Options:
A FeO
B SO2
C Cu2O
D Cu2S

The correct answer is:
SO2

Solution:
The evolution of SO2 during the process results in the blistered appearance, giving rise to blister copper.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
Which compound will liberate oxygen when reacts with ice cold water?

Options:
A Na2O2
B KO2
C Na2O
D Cs2O2

The correct answer is:
KO2

Solution:
KO2 will liberate oxygen when reacts with ice cold water as follows
2O2-+2H2O(l)→2OH-(aq)+H2O2(l)+O2(g)

Topic: Chemistry, s Block Elements, NEET
Which compounds are likely to have incomplete octets?

Options:
A Compounds with more than eight valence electrons
B Compounds with central atoms
C Compounds with exactly eight valence electrons
D Compounds with less than eight valence electrons

The correct answer is:
Compounds with less than eight valence electrons

Solution:
In some compounds, the number of electrons surrounding the central atom is less than eight, which implies incomplete octets.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which compounds can be prepared using sodium chloride?

Options:
A Na2O2, NaOH and Na2CO3
B H2SO4, HCl and HNO3
C CH4, C2H6, C3H8
D NaCl2, Na2SO4, Na3PO4

The correct answer is:
Na2O2, NaOH and Na2CO3

Solution:
Sodium chloride can be used in the preparation of Na2O2, NaOH, and Na2CO3.

Topic: Chemistry, s Block Elements, NEET