datavorous/entrance-exam-dataset huggingface dataset:
Specify the co-ordination geometry around and hybridisation of N and B atoms in a 1:1 complex of BF3 and NH3

Options:
A N: tetrahedral, sp3 ; B: tetrahedral, sp3
B N: pyramidal, sp3 ; B: pyramidal, sp3
C N: pyramidal, sp3 ; B: planar, sp2
D N: pyramidal, sp3 ; B: tetrahedral, sp3

The correct answer is:
N: tetrahedral, sp3 ; B: tetrahedral, sp3

Solution:
In the 1: 1 complex H3N:→BF3 , both N and B have sp3 hybridised and tetrahedral geometry as both N & B atoms have 4 bond pairs electrons .

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Speed of transverse wave in a string of density 100 kg m-2 and area of cross-section 10 mm2 under a tension of 103 N is

Options:
A 100 m s-1
B 1000 m s-1
C 200 m s-1
D 2000 m s-1

The correct answer is:
1000 m s-1

Solution:
Speed of transverse wave in a string,
v=Tρ(A) ,
v=10310010×10-6
v=1000 m s-1

Topic: Physics, Waves and Sound, NEET
Speeds of two identical cars are u and 4u, respectively, at a specific instant. If the same retardation is applied to both the cars, the ratio of the respective distances in which the two cars are stopped, from that instant, is

Options:
A 1 : 1
B 1 : 4
C 1 : 8
D 1 : 16

The correct answer is:
1 : 16

Solution:
Both the cars are given the same deceleration simultaneously and both finally stop.
Formula relevant to motion : u2=2as
â´ For the first car, sâ¡ 1 = u 2 2 a
For the second car, sâ¡ 2 = 4 uâ¡ 2 2 a = 1 6 uâ¡ 2 2 a
â´ sâ¡ 1 sâ¡ 2 = 1 1 6

Topic: Physics, Motion In One Dimension, NEET
Spermatogenesis starts at the age of puberty due to the significant increase in the secretion of

Options:
A somatostatin from hypothalamus
B GnRH from hypothalamus
C GnRH from the anterior pituitary
D sexcorticoids from the adrenal gland

The correct answer is:
GnRH from hypothalamus

Solution:
Spermatogenesis is formation and maturation of sperms. It takes place in the testes (male gonads) due to gonadotrophic hormones (GnH). These are released from anterior pituitary. The hormones of anterior pituitary are under the influence of releasing and inhibiting hypothalamic hormones. Thus GnH are released when GnRH (Gonadotropin releasing hormones) from hypothalamus reach the anterior pituitary.

Topic: Biology, Chemical Coordination and Integration, NEET
Spermiation is the process of the release of sperms from

Options:
A Seminiferous tubules
B Vas deferens
C Epididymis
D Prostate gland

The correct answer is:
Seminiferous tubules

Solution:
Spermiation is the process of the release of sperms from Seminiferous tubules.

Topic: Biology, Human Reproduction, NEET
Spermicidal creams, jellies and foams are usually used along with ___ to increase their contraceptive efficiency.

Options:
A Copper T
B Diaphragm
C Norplant
D Hormonal pills

The correct answer is:
Diaphragm

Solution:
Diaphragms, cervical caps and vaults are also barriers made of rubber that are inserted into the female reproductive tract to cover the cervix during coitus. They prevent conception by blocking the entry of sperms through the cervix. They are reusable. Spermicidal creams, jellies and foams are usually used alongwith these barriers to increase their contraceptive efficiency.

Topic: Biology, Reproductive Health, NEET
Sperm's acrosome has

Options:
A Acid phosphatase, hyaluronic acid and proacrosin
B Hyaluronic acid, acid phosphatase and Fertilizin
C Hyaluronidase, proacrosin, and acid phosphatase
D Fertilizin, proacrosin and acid phosphatase

The correct answer is:
Hyaluronidase, proacrosin, and acid phosphatase

Solution:
The acrosome of sperm contains lytic enzymes such as cathepsin, acid phosphatase, hyaluronidase, proacrosin. Hyaluronidase enzyme is found particularly in the sperms of mammals. This enzyme dissolves corona radiata enables the sperm to penetrate through it. Proacrosin changes into acrosin and helps to dissolve the zona pellucida layer of the ovum.

Topic: Biology, Human Reproduction, NEET
Sphenoid bone is found in:

Options:
A Hind limb
B Lower jaw
C Pelvic girdle
D Skull

The correct answer is:
Skull

Solution:
The sphenoid bone is found in the human skull. Sphenoid bone, one of the most complex bones of the human body, is classified as an irregular bone. Sphenoid bone has many essential functions. It forms the base and lateral sides of the skull together with the orbital floor. It articulates with other bones and provides rigidity to the skull. It is an attachment site for many of the muscles of mastication.

Topic: Biology, Locomotion and Movement, NEET
Spherical wave fronts shown in figure, strike a plane mirror. Reflected wave fronts will be as shown in

Options:
A
B
C
D

The correct answer is:

Solution:
According to Huygan's principle Ray of light is perpendicular to wave front

Topic: Physics, Wave Optics, NEET
Sphincter of Oddi is present at:

Options:
A Ileo-caecal junction
B Junction of hepato-pancreatic duct and duodenum
C Gastro-oesophageal junction
D Junction of jejunum and duodenum

The correct answer is:
Junction of hepato-pancreatic duct and duodenum

Solution:
The bile duct and the pancreatic duct open together into the duodenum as the common hepato-pancreatic duct which is guarded by a sphincter called the sphincter of Oddi.

Topic: Biology, Digestion and Absorption, NEET, NEET 2021
Spin only magnetic moment 2.84 BM is given by:
(Atomic Number of Ni=28,Ti=22,Cr=24,Co=27)

Options:
A Ni2+
B Ti3+
C Cr2+
D Co2+

The correct answer is:
Ni2+

Solution:
Î¼= n( n+2 ) =2.84ân=2
electronic configuration of Ni +2 =1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 8 e â having two unpaired electrons
electron configuration of T i 3+ =1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 1 only one unpaired electron
electron configuration of C r 2+ =1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 4 having four unpaired electrons
electron configuration of C o +2 =1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 7 having three unpaired electrons.

Topic: Chemistry, d and f Block Elements, NEET, NEET 2015 (Phase 1)
Spin only magnetic moment in B.M. of the compound Hg(II)[Co(SCN)4] is -

Options:
A 3
B 15
C 24
D 8

The correct answer is:
15

Solution:
In Hg(II) [Co(SCN)4], Co2+ has 3d7 configuration. SCN- produces weak ligand field, no pairing of electrons in d-orbitals occurs against Hundâs rule, hence :
Î¼ = n n + 2
n = No. of unpaired e-
BM = Bohr's magneton
Co is in +2 state in this given complex
Co â Atomic Number 2 7

Topic: Chemistry, Coordination Compounds, NEET
'Spin only' magnetic moment is same for which of the following ions?
A. $\mathrm{Ti}^{3+}$
B. $\mathrm{Cr}^{2+}$
C. $\mathrm{Mn}^{2+}$
D. $\mathrm{Fe}^{2+}$
E. $\mathrm{Sc}^{3+}$
Choose the most appropriate answer from the options given below.

Options:
A A and E only
B B and C only
C A and D only
D B and D only

The correct answer is:
B and D only

Solution:
\begin{array}{lcc} Ions & No. of unpaired electrons & Configuration \\\mathrm{Ti}^{3+} & 1 & 3 d^1 \\\mathrm{Cr}^{2+} & 4 & 3 d^4 \\\mathrm{Mn}^{2+} & 5 & 3 d^5 \\\mathrm{Fe}^{2+} & 4 & 3 d^6 \\\mathrm{Sc}^{3+} & 0 & 3 d^0\end{array}
Spin only magnetic moment is given by $\sqrt{n(n+2)} \mathrm{BM}$
$\therefore \mathrm{Cr}^{2+}$ and $\mathrm{Fe}^{2+}$ will have same spin only magnetic moment.

Topic: Chemistry, d and f Block Elements, NEET, NEET 2024
Spindle fibers attach to kinetochores of chromosomes during

Options:
A Metaphase
B Anaphase
C Telophase
D Prophase

The correct answer is:
Metaphase

Solution:
Spindle fibers attach to kinetochores of chromosome in metaphase stage.

Topic: Biology, Cell Cycle and Cell Division, NEET, NEET 2024
Spindle fibres are made up of

Options:
A Proteins
B Cellulose
C Lipids
D Pectin

The correct answer is:
Proteins

Solution:
Spindle fiber âis the assembly of the mitotic spindle, the microtubules, the proteinaceous components of the cell cytoplasm help in the process of cell division and are made of a protein called tubulin. The spindle is necessary to equally divide the chromosomes in a parental cell into two daughter cells during both types of nuclear division: mitosis and meiosis.

Topic: Biology, Cell Cycle and Cell Division, NEET
Spindle fibres attach on to:

Options:
A Telomere of the chromosome
B Kinetochore of the chromosome
C Centrosome
D NOR of the chromosome

The correct answer is:
Kinetochore of the chromosome

Solution:
Kinetochore of chromosomes facilitates the attachment of spindle fibre (chromosomal fibre) and the poles. A chromosome consists of two identical halves, the chromatids which are held together at on point called the centromere. On the sides of the centromere, disc-shaped structure are present known as kinetochores.

Topic: Biology, Cell Cycle and Cell Division, NEET, NEET 2016 (Phase 1)
Spindle fibres attach on to:

Options:
A Telomere of the chromosome
B Kinetochore of the chromosome
C Centrosome
D NOR of the chromosome

The correct answer is:
Kinetochore of the chromosome

Solution:
Kinetochore of chromosomes facilitates the attachment of spindle fibre (chromosomal fibre) and the poles.

Topic: Biology, Cell Cycle and Cell Division, NEET
Spliceosomes are not found in cells of:

Options:
A Plants
B Fungi
C Animals
D Bacteria

The correct answer is:
Bacteria

Solution:
Splicing is the process of removal of introns and joining of exons in a defined order. Introns are removed by small nuclear RNA (snRNA) and protein complex called small nuclear ribonucleoproteins or snRNPs (snurps) or splicosome complex. Introns are absent in prokaryotes hence post-transcriptional modification is absent.

Topic: Biology, Molecular Basis of Inheritance, NEET, NEET 2017
Splicing means

Options:
A Removal of introns
B Removal of exons
C Joining of rDNA
D Transfer of rDNA

The correct answer is:
Removal of introns

Solution:
Splicing is a process in which hnRNA undergoes processing to form functional mRNA. hnRNA consists of functional or active segments called exon and non-functional on inactive segments called introns. In splicing, introns are cut and removed and only functional exons are joined to form functional mRNA.

Topic: Biology, Molecular Basis of Inheritance, NEET
Splitting of centromere of a chromosome during cell division occurs in

Options:
A Metaphase
B Anaphase
C Prophase
D Telophase

The correct answer is:
Anaphase

Solution:
During cell division, when chromosomes are pulled apart into different cells, the centromeres present in the middle of a chromosomes split. This splitting of chromosome occurs during anaphase of mitosis.

Topic: Biology, Cell Cycle and Cell Division, NEET
Splitting of the centromere is a significance feature of

Options:
A Anaphase
B Anaphase I
C Anaphase II
D Both a and c

The correct answer is:
Both a and c

Solution:
During anaphase of mitosis and anaphase II of meiosis centromere splits and chromatids are separated, these chromatids are known as daughter chromosome and they start moving towards opposite poles. During anaphase I of meiosis, disjunction of chromosomal pair occurs and chromosomes are separated.

Topic: Biology, Cell Cycle and Cell Division, NEET
Spooling is:

Options:
A Amplification of DNA
B Cutting of separated DNA bands from the agarose gel
C Transfer of separated DNA fragments to synthetic membranes
D Collection of isolated DNA

The correct answer is:
Collection of isolated DNA

Solution:
Purified DNA can be precipitated out after the addition of chilled ethanol. Such precipitates of DNA appears as fine threads in the suspension and can be taken out by a method called spooling.

Transfer of separated DNA fragments to synthetic membranes is called blotting.

Amplification of DNA is carried out by PCR.

Cutting of separated DNA bands from the agarose gel is called elution.

Topic: Biology, Biotechnology - Principles and Processes, NEET, NEET 2020 (Phase 2)
Spore dissemination in some liverworts is aided by:

Options:
A indusium
B calyptra
C peristome teeth
D elaters.

The correct answer is:
elaters.

Solution:
Elater: It is an elongated, spirally thickened, water-attracting cell in the capsule of a liverwort, derived from sporogenous tissue and assisting in spore dispersal. Within the spore capsules of many liverwort species there are elaters as well as spores. Elaters do not work in the same way in all species and there are some species where elaters play little or no role in spore release.
Related Theory
Mosses lack elaters. Within a developing hornwort sporophyte, the developing spores are mixed with sterile cells of varying form. These may be single-celled or multicelled and branched (liverwort elaters can be branched as well) or unbranched. Some bryologists call all such structures pseudoelaters, while others hold that some true elaters are present in some hornwort species. Note that by the definition of elaters as single-celled, the multi-celled sterile cells; within hornwort sporophytes cannot be elaters - leaving just the single-celled sterile cells subject to debate. As with the liverworts, the elaters or pseudoelaters of the hornworts play varying roles in spore dispersal.

Topic: Biology, Plant Kingdom, NEET, NEET 2007
Spore producing body of a cellular slime mould is:

Options:
A Pseudoplasmodium
B Plasmodium
C Sporangium
D Sporophore

The correct answer is:
Sporangium

Solution:
In slime moulds, the multinucleate protoplasm of a sporangium undergoes cleavage to form spores.

Topic: Biology, Biological Classification, NEET
Sporeine kills insects by inhibiting ion transport in the

Options:
A Midgut
B Foregut
C Hindgut
D None

The correct answer is:
Midgut

Solution:
Insecticides are stomach/alimentary canal poisons or fumigants to the insects. Control of insects by the use of bioinsecticides is common application in agricultural practice. Natural insecticides include Azadirachta indica (azadirachtin), Derris (rotenone) and Chrysanthemum (pyrethrum). The first commercial bioinsecticide is known as sporeine and is developed in Germany. Sporeine kills insects by inhibiting ion transport in the midgut. Genes for some of these toxins have been isolated and transferred to host through recombinant DNA technology (transgenic plants).

Topic: Biology, Microbes in Human Welfare, NEET
Sporogony of malarial parasite occurs in:

Options:
A Stomach wall of mosquito
B Salivary glands of mosquito
C RBCs of man
D Liver of man

The correct answer is:
Stomach wall of mosquito

Solution:
Sporogony of malarial parasites occurs in the stomach wall of mosquito. It is an asexual multiplication phase. The nucleus of the oocyst divides and followed by cytoplasmic division, several sporozoites are formed. This is the infective stage when a mosquito bites a human, thousands of sporozoites enter into the blood of the human.

Topic: Biology, Human Health and Diseases, NEET
Spot the odd one out from the following structures with reference to the male reproductive system

Options:
A Rete testis
B Epididymis
C Vasa efferentia
D Isthmus

The correct answer is:
Isthmus

Solution:
Male reproductive system contains rete testis, vasa efferentia, Epididymis and vas deferens etc. Female reproductive system contain isthmus, ampulla, infundibulum and uterus etc.

Topic: Biology, Human Reproduction, NEET
Spotlight S rotates in a horizontal plane with a constant angular velocity of 0.1 rad s-1. The spot of light P moves along the wall at a distance of 3 m. The velocity of the spot P when Î¸=45Â° (see. fig.) is

Options:
A 0.3 m s-1
B 0.2 m s-1
C 0.6 m s-1
D 0.1 m s-1

The correct answer is:
0.3 m s-1

Solution:
tan Î¸ = SM PM
â´ PM = SM tan Î¸
=3tanÎ¸=3 mâÎ¸=45Â°
v=rÏ=3tan45Â°Ã0.1=0.3âmâ sâ1

Topic: Physics, Laws of Motion, NEET
Spraying of which of the following phytohormone on juvenile conifers helps in hastening the maturity period, that leads to early seed production?

Options:
A Abscisic Acid
B Indole-3-butyric Acid
C Gibberellic Acid
D Zeatin

The correct answer is:
Gibberellic Acid

Solution:
Spraying juvenile conifers with GAs hastens the maturity period, thus leading to early seed production. Gibberellins also promotes bolting (internode elongation just prior to flowering) in beet, cabbages and many plants with rosette habit.

Topic: Biology, Plant - Growth and Development, NEET, NEET 2023 (All India)
Spraying sugarcane crop with which of the following plant growth regulators, increases the length of stem, thus, increasing the yield?

Options:
A Gibberellin
B Cytokinin
C Abscisic acid
D Auxin

The correct answer is:
Gibberellin

Solution:
Sugarcanes store carbohydrate as sugar in their stems. Spraying sugarcane crop with gibberellins increases the length of the stem, thus increasing the yield.

Topic: Biology, Plant - Growth and Development, NEET, NEET 2024
'Stability of a crystal is reflected in the magnitude of its melting points'. Is it true ?

Options:
A True
B False
C Partially correct
D It depends

The correct answer is:
True

Solution:
Correct Option is : (A)
True

Topic: Chemistry, Solid State, NEET
“Stability of carbocations depends upon the electron releasing inductive effect of groups adjacent to positively charged carbon atom involvement of neighbouring groups in hyperconjugation and resonance.” Which of the following structures is more stable?

Options:
A Structure I is more stable because every atom has complete octet
B Structure II is more stable because every atom has complete octet
C Structure II and Structure I are equally stable
D None of the given structures are stable

The correct answer is:
Structure II is more stable because every atom has complete octet

Solution:
Correct Option is : (B)
Structure II is more stable because every atom has complete octet

Topic: Chemistry, General Organic Chemistry, NEET
Standrad entropies of X2,Y2 and XY3 are 60, 40 and 50 JK-1mol-1 respectively. For the reaction 12X2+32Y2âXY3,ÎH=-30 kJ to be at equilibrium, the temperature should be

Options:
A 500 K
B 750 K
C 1000 K
D 1250 K

The correct answer is:
750 K

Solution:
As for this reaction 12X2+32Y2âXY3
ÎS=âSP-âSR
ÎS=50-12Ã60+32Ã40=-40 JK-1mol-1
ÎG=ÎH-TÎS
Now as at equilibrium ÎG=0
So ÎH-T.ÎS=0
Or T=ÎHÎS=-30Ã103-40
T=750 K

Topic: Chemistry, Thermodynamics (C), NEET
Stanley Miller in his experiment to prove the Oparin-Haldane hypothesis used ______, _____ and _____ in the spark chamber.

Options:
A CH3, NH3, H2O
B CH4, NH3, H2
C CH4, NH3 Urea
D CH4, NH3, Uric acid

The correct answer is:
CH4, NH3, H2

Solution:
Oparin and Haldane gave the theory of chemical evolution which explained origin of life. This theory was properly explained to explain this concept. Miller and Urey also performed as experiment and thus confirmed the above theory as well. They demonstrated the presence of conditions in the lab which simulate the earth's atmosphere in the beginning. To prove Oparin-Haldane theory mixture of methane, ammonia and hydrogen was used as early atmosphere had these substances due interaction between hydrogen, carbon, oxygen and nitrogen and hydrogen being most reactive.

Topic: Biology, Evolution, NEET
Starch cannot be transported in plants because it is

Options:
A polymer of galactose.
B present in the storage form.
C stachyose.
D polymer of sucrose.

The correct answer is:
present in the storage form.

Solution:
Starch is the polymer of glucose and is a plant storage polysaccharide. It is mobilized into glucose. Sucrose is the form of sugar transported through phloem during translocation. Since it is soluble and less reactive it is an ideal form of sugar to transport.

Topic: Chemistry, Biomolecules, NEET
Starch grain in pea plant shows

Options:
A complete dominance
B incomplete dominance
C co-dominance
D epistasis

The correct answer is:
incomplete dominance

Solution:
Starch grain size in pea is controlled by gene Bb which in the dominant state produces an enzyme starch debranching enzyme (SBE). Starch is synthesized effectively by BB homozygotes and therefore large grains are produced. In bb, homozygous have lesser efficiency in starch synthesis and produce smaller starch grains. In Bb heterozygous condition starch grains produces are intermediate in size thus shows incomplete dominance.

Topic: Biology, Principles of Inheritance and Variation, NEET
Starch is converted into Maltose by

Options:
A Diastase
B Invertase
C Maltase
D Urease

The correct answer is:
Diastase

Solution:
Correct Option is : 1
Diastase

Topic: Chemistry, Surface Chemistry, NEET
Starting from propanoic acid, identify the compound Z in the following reactions.
Propanoicacid→SOCl2X→NH3Y→Br2+KOHZ

Options:
A CH3-CH2-Br
B CH3-CH2-NH2
C C H 3 −C H 2 −COBr
D CH3-CH2-CH2-NH2

The correct answer is:
CH3-CH2-NH2

Solution:
Carboxylic acid form acyl chloride with SOCl2 , which on further reaction with ammonia gives amide. The amide further undergo Hofmann Bromamide reaction (degradation) to give amine.

Topic: Chemistry, Carboxylic Acid Derivatives, NEET
Starting from the center of the earth having radius, R, the variation of g (acceleration due to gravity) is shown by

Options:
A
B
C
D

The correct answer is:

Solution:
gin=GMrR3⇒gin∝r.

gout=GMr2⇒gout∝1r2.

Topic: Physics, Gravitation, NEET, NEET 2016 (Phase 2)
Starting with a sample of pure 66Cu, 78 of it decays into Zn in 15 min. The corresponding half-life is

Options:
A 10 min

B 15 min
C 5 min
D 712 min

The correct answer is:
5 min

Solution:
N = N0(1- e-λt), N - The amount of substance decayed.
⇒ N0-NN0=e-λt
∴ 18=e-λt
⇒ 8=eλt
⇒ 3ln2 =λt
⇒ λ=3 × 0.69315
Half-life period

λ = 5 min

Topic: Physics, Nuclear Physics, NEET
Starting with a sample of pure 66 Cu , 78 of it decays into Zn in 15 minutes. The corresponding half-life is

Options:
A 7 1 2 minutes
B 10 minutes
C 14 minutes
D 5 minutes

The correct answer is:
5 minutes

Solution:
N N 0 = 1 2 t / T
â´ 1 8 = 1 2 15 / T â 1 2 3 = 1 2 15 / T
â´ 15 T = 3 â T = 5 min .

Topic: Physics, Atomic Physics, NEET
Starting with a sample of pure Cu66, 78 of it decays into Zn in 15 minutes. The corresponding half-life is

Options:
A 10 minutes
B 15 minutes
C 5 minutes
D 7.5 minutes

The correct answer is:
5 minutes

Solution:
The undecayed mass left after time t is given by
N=N012tT
Here, t=15 min; N=N0-7N08=N08
∴ N08=N01215T
Or 215T=8=23
Or T=153=5 min

Topic: Physics, Nuclear Physics, NEET
Starting with sodium chloride, how would you proceed to prepare sodium carbonate?

Options:
A Electrolysis of molten sodium chloride.
B Reacting sodium chloride with sulfuric acid.
C Treating sodium chloride with ammonia.
D Reacting sodium chloride with calcium carbonate.

The correct answer is:
Electrolysis of molten sodium chloride.

Solution:
Correct Option is : (A)
Electrolysis of molten sodium chloride.

Topic: Chemistry, s Block Elements, NEET
Starting with sodium chloride, how would you proceed to prepare sodium hydroxide?

Options:
A Electrolysis of molten sodium chloride.
B Reacting sodium chloride with sulfuric acid.
C Treating sodium chloride with ammonia.
D Reacting sodium chloride with calcium hydroxide.

The correct answer is:
Reacting sodium chloride with sulfuric acid.

Solution:
Correct Option is : (B)
Reacting sodium chloride with sulfuric acid.

Topic: Chemistry, s Block Elements, NEET
Starting with sodium chloride, how would you proceed to prepare sodium metal?

Options:
A Electrolysis of molten sodium chloride.
B Reacting sodium chloride with sulfuric acid.
C Heating sodium chloride with oxygen.
D Treating sodium chloride with ammonia.

The correct answer is:
Electrolysis of molten sodium chloride.

Solution:
Correct Option is : (A)
Electrolysis of molten sodium chloride.

Topic: Chemistry, s Block Elements, NEET
Starting with sodium chloride, how would you proceed to prepare sodium peroxide?

Options:
A Electrolysis of molten sodium chloride.
B Reacting sodium chloride with sulfuric acid.
C Heating sodium chloride with oxygen.
D Treating sodium chloride with ammonia.

The correct answer is:
Heating sodium chloride with oxygen.

Solution:
Correct Option is : (C)
Heating sodium chloride with oxygen.

Topic: Chemistry, s Block Elements, NEET