datavorous/entrance-exam-dataset huggingface dataset:
Which of the following compounds has the lowest melting point?

Options:
A $\mathrm{CaBr}_2$
B $\mathrm{CaI}_2$
C $\mathrm{CaF}_2$
D $\mathrm{CaCl}_2$

The correct answer is:
$\mathrm{CaI}_2$

Solution:
As covalent character increases, melting point decreases, thus order of melting point is
$$
\mathrm{CaF}_2>\mathrm{CaCl}_2>\mathrm{CaBr}_2>\mathrm{CaI}_2
$$

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET, NEET 2011 (Screening)
Which of the following compounds is an alkene?

Options:
A Ethane
B Methanol
C Ethanol
D Ethene

The correct answer is:
Ethene

Solution:
Ethene is an alkene, characterized by a double bond between two carbon atoms. Alkanes do not have double bonds.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following compounds is an example of an electron-deficient hydride?

Options:
A Methane (CH4)
B Ammonia (NH3)
C Water (H2O)
D Diborane (B2H6)

The correct answer is:
Diborane (B2H6)

Solution:
Diborane (B2H6) is an example of an electron-deficient hydride.

Topic: Chemistry, Hydrogen, NEET
Which of the following compounds is commonly used as a solvent in the Friedel-Crafts alkylation reaction?

Options:
A Water
B Ethanol
C Anhydrous aluminum chloride
D Dichloromethane

The correct answer is:
Dichloromethane

Solution:
Dichloromethane is a common solvent used in the Friedel-Crafts alkylation reaction to dissolve and facilitate the reaction between the reagents.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following compounds is formed, when a mixture of K2Cr2O7 and NaCl is heated with concentrated H2SO4 ?

Options:
A CrO2Cl2
B CrCl3
C Cr2(SO4)3
D Na2CrO4

The correct answer is:
CrO2Cl2

Solution:
Red vapours of CrO2Cl2 are obtained.
K2Cr2O7+2H2SO4âKHSO4+2CrO3+H2O
KCl+H2SO4âKHSO4+HCl
CrO 3  + 2HCl→ CrO 2 Cl 2 Chromyl chloride Red oily vapours  +  H 2 O
Note: When these vapours are passed into NaOH solution, yellow colouration is obtained. This yellow solution is acidified with acetic acid. When lead acetate is added to this solution, yellow precipitate of PbCrO4 is obtained.
4NaOHâ+â CrO 2 Cl 2 â Na 2 CrO 4 Yellowâsolution â+â2NaClâ+â H 2 O
(CH 3 COO) 2 Pbâ+â Na 2 CrO 4 â 2CH 3 COONaâ+â PbCrO 4 Yellowâppt.

Topic: Chemistry, d and f Block Elements, NEET
Which of the following compounds is formed when an ester reacts as a nucleophile in a substitution reaction?

Options:
A Alkyl cyanide
B Alkyl nitrite
C Alkyl isocyanide
D Alkyl ester

The correct answer is:
Alkyl ester

Solution:
When an ester reacts as a nucleophile, it forms an alkyl ester.

Topic: Chemistry, Amines, NEET
Which of the following compounds is known as Acetophenone?

Options:
A 1-phenylbutanone
B 1-phenylethanone
C 1-phenylbutan-2-one
D 1-phenylpropanone

The correct answer is:
1-phenylethanone

Solution:
Correct Option is : 2
1-phenylethanone

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following compounds is likely to have the highest boiling point?

Options:
A Ethanol
B Methoxymethane (dimethyl ether)
C Ethyl chloride
D Ethyl fluoride

The correct answer is:
Ethanol

Solution:
Ethanol has the highest boiling point due to hydrogen bonding.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following compounds is most acidic?

Options:
A CH4
B C2H6
C CH≡CH
D C2H5OH

The correct answer is:
C2H5OH

Solution:
Proton donors are acids. Among given choices C2H5OH can give protonH+ most easily.
â´C2H5OH is most acidic among C2H6,CH4, CHâ¡CH and C2H5OH

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following compounds is most likely to be formed when the alkene CH3-CH=CH-CH3 is oxidized with acidic potassium permanganate?

Options:
A Acetone
B Acetic acid
C Ethanol
D Methane

The correct answer is:
Acetic acid

Solution:
The oxidation of the alkene CH3-CH=CH-CH3 using acidic potassium permanganate is likely to produce acetic acid as the product.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following compounds is not chiral?

Options:
A CH3CHDCH2Cl
B CH3CH2CHDCl
C DCH2CH2CH2Cl
D CH3CHClCH2D

The correct answer is:
DCH2CH2CH2Cl

Solution:
The above compound has no chiral 'C'-atom. All the 'C' atoms are attached to two identical 'H' atoms, so they are not asymmetrical or chiral.

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following compounds is oxidised to prepare methyl ethyl ketone?

Options:
A 2 - propanol
B 1 - butanol
C 2 - butanol
D Tert-butyl alcohol

The correct answer is:
2 - butanol

Solution:

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following compounds is used in cosmetic surgery?

Options:
A Silica
B Silicates
C Silicones
D Zeolites

The correct answer is:
Silicones

Solution:
Silicones are synthetic organo-silicon polymers contaning repeated $\mathrm{R}_2 \mathrm{SiO}$ units. It is used in surgical and cosmetic implants. They are also used as low temperature lubricants, in making waterproof clothes and paper, etc.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET, NEET 2019 (Odisha)
Which of the following compounds is used in the manufacture of dacron?

Options:
A Styrene
B Glycol
C hexamethylenediamine
D Caprolactam

The correct answer is:
hexamethylenediamine

Solution:
Correct Option is : 3
hexamethylenediamine

Topic: Chemistry, Polymers, NEET
Which of the following compounds is used in the manufacture of dacron?

Options:
A Styrene
B Glycol
C adipic acid
D Caprolactam

The correct answer is:
Glycol

Solution:
Correct Option is : 2
Glycol

Topic: Chemistry, Polymers, NEET
Which of the following compounds is used in the manufacture of Nylon 6?

Options:
A Styrene
B Caprolactam
C Butadiene
D Glycol

The correct answer is:
Caprolactam

Solution:
Correct Option is : 2
Caprolactam

Topic: Chemistry, Polymers, NEET
Which of the following compounds is used in the manufacture of PHBV?

Options:
A 3-Hydroxybutanoic acid
B Terephthalic acid
C adipic acid
D Caprolactam

The correct answer is:
3-Hydroxybutanoic acid

Solution:
Correct Option is : 1
3-Hydroxybutanoic acid

Topic: Chemistry, Polymers, NEET
Which of the following compounds liberates dihydrogen gas at anode when it is electrolysed in molten state but the same gas is liberated at cathode if its aqueous solution is electrolysed?

Options:
A NaCl
B NaH
C PH4I
D CuSO4

The correct answer is:
NaH

Solution:
NaH contains H as H- ions but aqueous solution of NaH contains NaOH and its electrolysis liberates hydrogen at cathode.

Topic: Chemistry, s Block Elements, NEET
Which of the following compounds on hydrolysis gives acetylene?

Options:
A CaC2
B Mg2C3
C Al4C3
D Be2C

The correct answer is:
CaC2

Solution:
Calcium carbide on hydrolysis gives acetylene.
CaC2+2H2O→HC≡CH+Ca(OH)2

Topic: Chemistry, Hydrocarbons, NEET
Which of the following compounds on hydrolysis gives propyne?

Options:
A CaC2
B Mg2C3
C Al4C3
D Be2C

The correct answer is:
Mg2C3

Solution:
Mg2C3+4H2O→C3H4+2Mg(OH)2
Calcium carbide gives acetylene while beryllium and aluminium carbide gives methane on hydrolysis.

Topic: Chemistry, s Block Elements, NEET
Which of the following compounds shall not produce propene by reaction with HBr followed by elimination or direct only elimination reaction?

Options:
A
B
C
D

The correct answer is:

Solution:
has only two carbon atoms, which cannot be converted into propene as the conditions are given.

Topic: Chemistry, Hydrocarbons, NEET, NEET 2016 (Phase 2)
Which of the following compounds shall not produce propene by reaction with HBr followed by elimination or direct only elimination reaction?

Options:
A
B H3C-CH2-CH2OH
C H2C=C=O
D H3C-CH2-CH2Br

The correct answer is:
H2C=C=O

Solution:

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which of the following compounds shows the presence of intramolecular hydrogen bond?

Options:
A H2O2
B HCN
C Cellulose
D Concentrated acetic acid

The correct answer is:
Cellulose

Solution:
H2O2,HCN and conc. CH3COOH form intermolecular hydrogen bonding while cellulose has intramolecular hydrogen bonding.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following compounds shows yellow colour?

Options:
A [Co(NH3)6]3+3Cl–
B [CoCl(NH3)5]2+2Cl–
C [CoCl2(NH3)4]+Cl–
D [CoCl3(NH3)3]

The correct answer is:
[Co(NH3)6]3+3Cl–

Solution:
Correct Option is : 1
[Co(NH3)6]3+3Cl–

Topic: Chemistry, Coordination Compounds, NEET
Which of the following compounds undergo E2 reactions with maximum rate?

Options:
A CH 3 C CH 3 Br CH 2 CH 3
B CH3(CH2)2CH2Cl
C CH3(CH2)2CH2I
D CH 3 C CH 3 I CH 2 CH 3

The correct answer is:
CH 3 C CH 3 I CH 2 CH 3

Solution:
Rate of elimination depends on degree of alkyl halide and nature of leaving group. C-I bond is broken easily as iodide is good leaving group. More over, the ease of elimination reaction is in the order 3 o alkylhalide> 2 o alkylhalide> 1 o alkylhalide .

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which of the following compounds undergoes sulphonation?

Options:
A Ethanol
B Methane
C Benzene
D Acetic acid

The correct answer is:
Benzene

Solution:
Sulphonation typically occurs in aromatic compounds like benzene.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following compounds will be suitable for Kjeldahl’s method for nitrogen estimation?

Options:
A
B
C
D

The correct answer is:

Solution:
Kjeldahl’s method is not used in the case of nitro, azo compounds and also to the compounds containing nitrogen in the ring e.g. Pyridine.

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following compounds will exhibit cis-trans (geometrical) isomerism?

Options:
A 2-butene
B Butanol
C 2-butyne
D 2-butenol

The correct answer is:
2-butene

Solution:
Key Idea Compounds which have at least one double bond $(\mathrm{C}=\mathrm{C})$ and the groups attached with double bonded carbon atoms are different, exhibit geometrical isomerism.
$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{OH} \Rightarrow$ no geometrical isomers
butanol
$\mathrm{CH}_3 \mathrm{C} \equiv \mathrm{CCH}_3 \Rightarrow$ no geometrical isomers
$$
\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{C}(\mathrm{OH})=\mathrm{CH}_2
$$
$\Rightarrow$ no geometrical isomers.

Topic: Chemistry, General Organic Chemistry, NEET, NEET 2009 (Screening)
which of the following compounds will exhibit geometrical isomerism?

Options:
A 1-phenyl-2-butene
B 3-phenyl-1-butene
C 2-phenyl-1-butene
D 1,1-diphenyl-1-propene

The correct answer is:
1-phenyl-2-butene

Solution:
1 - phenyl but-2-ene show G.I. because both sp2- C atom attached with different atom or group

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following compounds will exhibit geometrical isomerism?

Options:
A 1, 1-Dipheyenyl-1-propene
B

1-Pheyl-2-butene

C 3-Phenyl-1-butene
D 2-Phenyl-1-butene

The correct answer is:

1-Pheyl-2-butene

Solution:
C 6 H 5 C H 2 âCH=CHâC H 3 (1-phenyl-2-butene) Exhibits the phenomenon of geometrical isomerism due to C ab = C ad structure, so its two isomers are possible which are given as follow.
â

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following compounds will form alcohol with NaNO2/HCl ?

Options:
A
B
C CH3-CH2-NH2
D All of these

The correct answer is:
All of these

Solution:
As all primary aliphatic amines on reaction with NaNO2/HCl give alcohol hence all of these will give alcohol as they are primary amines.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following compounds will give acetic acid with KMnO 4 / OH − /Δ

Options:
A CH3-CHO
B CH3-CH=CH-CH3
C CH3-C≡C-CH3
D All of these

The correct answer is:
All of these

Solution:
All these compounds can give acetic acid as follows
1.
2. CH3-CH=CH-CH3→[O]2CH3-COOH
3. CH3-C≡C-CH3→[O]2CH3COOH

Topic: Chemistry, Carboxylic Acid Derivatives, NEET
Which of the following compounds will give methyl orange by the reaction with diazonium salt of sodium p -amino benzene sulphonate?

Options:
A Aniline
B N, N-Dimethyl aniline
C m-nitro aniline
D m-bromophenol

The correct answer is:
N, N-Dimethyl aniline

Solution:
Methyle orange is formed from sodium 4-diazobenzenesulphonateand N,​N-dimethylamine

Topic: Chemistry, Amines, NEET
Which of the following compounds will have highest melting point?

Options:
A I
B II
C III
D All have equal melting point

The correct answer is:
II

Solution:
Compound II is most symmetrical because it has both -CH3 groups and Cl atoms para to each other. therefore, it fits in the crystal lattice better than the other two isomers and hence it has high melting point.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which of the following compounds will have the highest dipole moment?

Options:
A
B
C
D

The correct answer is:

Solution:
The electron-donation of -OH reinforces the electron-withdrawing by -NO2 . Also, resonance increases distance between the charges. Charge separation is maximum for p-nitrophenol, therefore, it has maximum dipole moment.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following compounds will have the highest melting point and why?

Options:
A II will have the highest melting point, due to symmetry of para-positions; it fits into the crystal lattice better than other isomers.
B III will have the highest melting point, due to symmetry of para-positions; it fits into the crystal lattice better than other isomers.
C I will have the highest melting point, due to symmetry of para-positions; it fits into the crystal lattice better than other isomers.
D I, II and III all will have the same melting point

The correct answer is:
II will have the highest melting point, due to symmetry of para-positions; it fits into the crystal lattice better than other isomers.

Solution:
Correct Option is : (A)
II will have the highest melting point, due to symmetry of para-positions; it fits into the crystal lattice better than other isomers.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which of the following compounds will not exist as resonance hybrid. Give reason for your answer : (i) CH3OH (ii) R—CONH2and (iii) CH3CH=CHCH2NH2

Options:
A R—CONH2; Any possible contributing structure will have charge separation and incomplete octet of electrons on atoms. So the structure will be unstable due to high energy.
B CH3CH=CHCH2NH2; Any possible contributing structure will have charge separation and incomplete octet of electrons on atoms. So the structure will be unstable due to high energy.
C Every compound mentioned will exist as resonance hybrid
D CH3OH; Any possible contributing structure will have charge separation and incomplete octet of electrons on atoms. So the structure will be unstable due to high energy.

The correct answer is:
CH3OH; Any possible contributing structure will have charge separation and incomplete octet of electrons on atoms. So the structure will be unstable due to high energy.

Solution:
Correct Option is : (D)
CH3OH; Any possible contributing structure will have charge separation and incomplete octet of electrons on atoms. So the structure will be unstable due to high energy.

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following compounds will not give Lassaigne’s test for nitrogen?

Options:
A NH2NH2
B C6H5NHNH2
C PhN=NPh
D NH2CONH2

The correct answer is:
NH2NH2

Solution:
In hydrazine, since nitrogen is not directly attached to a carbon atom so, it will not facilitate the Lassaigne’s test.Rest all have C-N bond so they can show it.

Topic: Chemistry, Amines, NEET
Which of the following compounds will not react with ethanolic KCN?

Options:
A CH3CH2Cl
B CH3COCl
C C6H5Cl
D

The correct answer is:
C6H5Cl

Solution:
Here only chlorobenzene does not react alcoholic KCN as it cannot show nucleophilic substitution easily. Rest other compound will react with it
A. CH3CH2Cl→C2H5OH+KCNCH3CH2CN+KCl
B. CH3COCl→C2H5OH+KCNCH3COCN+KCl
D.

Topic: Chemistry, Aldehydes and Ketones, NEET
Which of the following compounds will not undergo Friedal-Craft's reaction easily?

Options:
A Cumene
B Xylene
C Nitrobenzene
D Toluene

The correct answer is:
Nitrobenzene

Solution:
Nitro group being electron withdrawing, deactives the benzene nucleus to such an extent so that it becomes incapable to give Friedel-Crafts reaction.
Nitrobenzene because of its unreactivity towards Friedel-Craft's reaction is used as a solvent for this reaction.

Topic: Chemistry, Hydrocarbons, NEET, NEET 2013 (All India)
Which of the following compounds will not undergo Friedel-Craft's reaction easily?

Options:
A Xylene
B Nitrobenzene
C Toluene
D Cumene

The correct answer is:
Nitrobenzene

Solution:
As any aromatic compound with meta directing group don't show Freidal Craft's reaction easily.
So, nitrobenzene does not show it as in it -NO 2 group is ring deactivating and meta directing. In rest other compounds given here alkyl group is ring activating and ortho, para directing so this reaction is possible.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following compounds will produce a precipitate with AgNO3 ?

Options:
A
B
C
D

The correct answer is:

Solution:
As it can produce a very stable aromatic carbocation so will produce precipitate of AgBr with AgNO3 .

All other compounds given here do not show this reaction as removal of Br is tough due to need of more energy and also formation of less stable carbocations.

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following compounds will react with water in the presence of concentrated sulfuric acid to form an alcohol?

Options:
A Alkane
B Alkene
C Alkyne
D Aldehyde

The correct answer is:
Alkene

Solution:
Alkenes react with water in the presence of concentrated sulfuric acid to form alcohols.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following compounds will show cis-trans isomerism? (i) (CH3)2C=CH–C2H5, (ii) CH2=CBr2, (iii) C6H5CH=CH–CH3and (iv) CH3CH=CCl-CH3

Options:
A Structures (i) and (iii) show cis-trans isomerism
B Structures (i) and (ii) show cis-trans isomerism
C Structures (ii) and (iv) show cis-trans isomerism
D Structures (iii) and (iv) show cis-trans isomerism

The correct answer is:
Structures (iii) and (iv) show cis-trans isomerism

Solution:
Correct Option is : (D)
Structures (iii) and (iv) show cis-trans isomerism

Topic: Chemistry, Hydrocarbons, NEET
Which of the following compounds will undergo carbylamine reactions?

Options:
A CH3CH22NH
B CH32NH
C C6H5NH2
D CH33N

The correct answer is:
C6H5NH2

Solution:
Carbylamine reaction is given by only primary amines (both aliphatic and aromatic). In this reation a primary amine reacts with chloroform in basic medium, to form a very bad smelling compound, called carbylamines
C6H5NH2+CHCl3KOH→C6H5NC+KCl+H2O

Topic: Chemistry, Amines, NEET
Which of the following compounds will undergo racemisation when solution of alcoholic KOH ?

Options:
A
B
C
D

The correct answer is:

Solution:
Only compound results information of racemic product due to chirality as it has one chiral carbon atom.

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which of the following compounds will undergo racemisation when solution of KOH hydrolyses?
(i)
(ii) CH3CH2CH2Cl
(iii)
(iv)

Options:
A (iv)
B (ii) and (i)
C (iii)
D (i) and (iv)

The correct answer is:
(iv)

Solution:
For racemisation process, there must be presence of chiral carbon atom which is present in only (iv) compound. Hence, the compound in option (iv) can undergo racemisation beacuse all the 4 substitutent groups are different and there is no plane of symmetry.

Topic: Chemistry, General Organic Chemistry, NEET, NEET 2014
Which of the following compounds would be most ionic in character?

Options:
A PbCl4
B PbCl2
C SnCl4
D SnCl2

The correct answer is:
PbCl2

Solution:
The lower valencies are more ionic, because the radius of M2+ is greater than that of M4+ and according to Fajan's rules, the smaller the ions, the greater is the tendency to covalency. PbCl2 is more ionic than SnCl2 , because Pb has lower electronegativity than that of Sn.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following compounds would undergo aldol condensation, which the Cannizzaro reaction and which neither? (i) Methanal (ii) 2-Methylpentanal (iii) Benzaldehyde (iv) Benzophenone (v) Cyclohexanone (vi) 1-Phenylpropanone (vii) Phenylacetaldehyde (viii) Butan-1-ol (ix) 2,2-Dimethylbutanal

Options:
A (i), (v), (vi), (vii) undergo Aldol condensation. (ii), (viii), (ix) undergo Cannizaro reaction. and (iv), (iii) does not undergo Aldol or Cannizaro
B (i), (v), (vi), (vii) undergo Aldol condensation. (ii), (iii), (ix) undergo Cannizaro reaction. and (iv), (viii) does not undergo Aldol or Cannizaro
C (ii), (v), (vi), (vii) undergo Aldol condensation. (i), (iii), (ix) undergo Cannizaro reaction. and (iv), (viii) does not undergo Aldol or Cannizaro
D (i), (vi), (vii) undergo Aldol condensation. (ii), (iii), (v), (ix) undergo Cannizaro reaction. and (iv), (viii) does not undergo Aldol or Cannizaro

The correct answer is:
(ii), (v), (vi), (vii) undergo Aldol condensation. (i), (iii), (ix) undergo Cannizaro reaction. and (iv), (viii) does not undergo Aldol or Cannizaro

Solution:
Correct Option is : (C)
(ii), (v), (vi), (vii) undergo Aldol condensation. (i), (iii), (ix) undergo Cannizaro reaction. and (iv), (viii) does not undergo Aldol or Cannizaro

Topic: Chemistry, Aldehydes and Ketones, NEET
Which of the following compounds would undergo SN1 reaction faster and why?

Options:
A Compound [A] and Compound [B] undergoes SN1 reaction at the same rate
B Compound [A] Undergoes SN1 reaction faster than [B] because in case of [A], the carbocation formed after the loss of Cl–is stabilized by resonance
C Compound [A] and Compound [B] does not undergo SN1 reaction
D Compound [B] Undergoes SN1 reaction faster than [A] because in case of [B], the carbocation formed after the loss of Cl–is stabilized by resonance

The correct answer is:
Compound [B] Undergoes SN1 reaction faster than [A] because in case of [B], the carbocation formed after the loss of Cl–is stabilized by resonance

Solution:
Correct Option is : (D)
Compound [B] Undergoes SN1 reaction faster than [A] because in case of [B], the carbocation formed after the loss of Cl–is stabilized by resonance

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which of the following compounds would you expect to have a dipole moment?

Options:
A
B
C
D

The correct answer is:

Solution:
is a polar compound while rest other here are non-polar as in them net dipole moment is zero as they are para isomers.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following concentration process will you use when the gangue is light?

Options:
A Gravity separation
B Froth Floatation
C Magnetic Separation
D Leaching

The correct answer is:
Gravity separation

Solution:
The lighter gangue particles are carried away by the water while the heavier ore particles settle down.

Topic: Chemistry, General Principles and Processes of Isolation of Metals, NEET
Which of the following concentration terms is affected by a change in temperature, unlike the others?

Options:
A Mass percentage
B ppm (parts per million)
C Mole fraction
D Molality

The correct answer is:
Mole fraction

Solution:
Correct Option is : (C)
Mole fraction

Topic: Chemistry, Solutions, NEET
Which of the following conclusions about a flower can't be deduced just by observing the floral formula?

Options:
A The flower has epipetalous stamens.
B The petals show contorted aestivation.
C The flower has epigynous insertion of floral whorls.
D The flower is actinomorphic.

The correct answer is:
The petals show contorted aestivation.

Solution:
In the floral formula, the epipetalous condition can be denoted by drawing an arc between C and A. The symbol for the actinomorphic flower is a circle with a plus sign within it. It can be seen in the Solanaceae family.
Epigynous insertion of Floral whorls can be depicted by drawing a small segment over G. This also indicates inferior ovary. For observing aestivation a floral diagram is required and a floral formula alone won't be sufficient.

Topic: Biology, Morphology of Flowering Plants, NEET