datavorous/entrance-exam-dataset huggingface dataset:
Amoebiasis is caused by

Options:
A protozoan.
B bacteria.
C fungi.
D invertebrates.

The correct answer is:
protozoan.

Solution:
Entamoeba histolytica (a protozoan parasite in the large intestine)
Amoebiasis (Amoebic dysentery)
Mode of infection: Contamination of food and water by houseflies (carrying the parasite mechanically from the faeces of an infected person to food).
Sign and symptoms: Abdominal pain and cramps, constipation, stools with excess mucous and blood clots.

Topic: Biology, Human Health and Diseases, NEET
Amoebic dysentery is caused by

Options:
A Entamoeba coli
B E. coli
C Entamoeba histolytica
D Entamoeba dispar

The correct answer is:
Entamoeba histolytica

Solution:
Entamoeba histolytica (a protozoan parasite in the large intestine)
Disease: Amoebiasis (Amoebic dysentery)
Mode of infection: Contamination of food and water by Houseflies.
Sign and symptoms: Abdominal pain and cramps, constipation, stools with excess mucous and blood clots.

Topic: Biology, Human Health and Diseases, NEET
Amol suffers from liver failure and he is advised liver transplantation. He has been advised a medicine help him accept the donor liver. What could be the medicine and what could be the source from which it is commercially obtained?

Options:
A Drug: Streptokinase, Organism: Streptococcus
B Drug: Statins, Organism: Clostridium
C Drug: Cyclosporin A, Organism: Trichoderma
D Drug: Statins, Organism: Monascus

The correct answer is:
Drug: Cyclosporin A, Organism: Trichoderma

Solution:
Cyclosporin A is a bioactive molecule that is derived from the fungus Trichoderma polysporum. It is used as an immunosuppressive agent in organ transplant patients. Usually, the donor organs can excite an immune reaction in the recipient's body, and the donor organs, in this case, the liver, will be rejected by the patient. Amol needs an immunosuppressive agent to accept the donor liver in his body.

Topic: Biology, Microbes in Human Welfare, NEET
Among (a)–(d) , the complexes that can display geometrical isomerism are
(A)[Pt(NH3)3Cl]+
(B)[Pt(NH3)Cl5]–
(C)[Pt(NH3)2Cl(NO2)]
(D)[Pt(NH3)4ClBr]2+

Options:
A (a)and(b)
B (c)and(d)
C (b)and(c)
D (d)and(a)

The correct answer is:
(c)and(d)

Solution:
[Pt(NH3)2Cl(NO2)] & [Pt(NH3)4ClBr]2+
[MA2BC] type
[MA4BC] type
(AA) (BC)
(AA) (AA) (BC)
(AB) (AC)
(AB) (AC) (AA)
2 G.I.
2 G.I.
Hence these two show G.I.

Topic: Chemistry, General Organic Chemistry, NEET
Among Al2O3,SiO2,P2O3 and SO2 the correct order of acid strength is

Options:
A Al2O3<SiO2<SO2<P2O3
B Al2O3<SiO2<P2O3<SO2
C SiO2<SO2<Al2O3<P2O3
D SO2<P2O3<SiO2<Al2O3

The correct answer is:
Al2O3<SiO2<P2O3<SO2

Solution:
While moving along a group from top to bottom, acidic nature of oxides decreases and along a period left to right, acidic nature increases.

So, Al2O3<SiO2<P2O3<SO2

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Among alkali metal halides, which one is the most covalent in nature?

Options:
A Lithium chloride
B Lithium bromide
C Lithium fluoride
D Lithium iodide

The correct answer is:
Lithium iodide

Solution:
Among alkali metal halides, lithium iodide is the most covalent in nature due to the high polarizing ability of the small lithium ion and the larger size of the iodide anion.

Topic: Chemistry, s Block Elements, NEET
Among alkali metals, which element do you expect to be least electronegative and why?

Options:
A Lithium, due to its smaller atomic size and lower effective nuclear charge.
B Sodium, as it has a completely filled inner electron shell, reducing its affinity for additional electrons.
C Cesium, because of its larger atomic size and weaker electron-nucleus attraction.
D Rubidium, as it is at the bottom of the group, with the least tendency to attract electrons.

The correct answer is:
Cesium, because of its larger atomic size and weaker electron-nucleus attraction.

Solution:
Correct Option is : (C)
Cesium, because of its larger atomic size and weaker electron-nucleus attraction.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Among alkali metals, which one reacts directly with nitrogen in air to form a nitride?

Options:
A Sodium
B Potassium
C Lithium
D Rubidium

The correct answer is:
Lithium

Solution:
Lithium shows exceptional behavior by reacting directly with nitrogen in air to form the nitride Li3N.

Topic: Chemistry, s Block Elements, NEET
Among beryllium, magnesium, calcium, strontium, and barium nitrates, which one forms anhydrous crystals?

Options:
A Beryllium nitrate (Be(NO3)2)
B Magnesium nitrate (Mg(NO3)2)
C Calcium nitrate (Ca(NO3)2)
D Strontium nitrate (Sr(NO3)2)

The correct answer is:
Strontium nitrate (Sr(NO3)2)

Solution:
Barium nitrate crystallizes as the anhydrous salt, meaning it does not contain water molecules in its crystal structure.

Topic: Chemistry, s Block Elements, NEET
Among beryllium, magnesium, calcium, strontium, and barium, which metal is most readily attacked by air to form the oxide and nitride?

Options:
A Beryllium (Be)
B Magnesium (Mg)
C Calcium (Ca)
D Barium (Ba)

The correct answer is:
Barium (Ba)

Solution:
Barium is the most readily attacked by air among these metals and forms both the oxide and nitride.

Topic: Chemistry, s Block Elements, NEET
Among CaH2,BeH2,BaH2, the order of ionic character is

Options:
A BeH2<BaH2<CaH2
B CaH2<BeH2<BaH2
C BeH2<CaH2<BaH2
D BaH2<BeH2<CaH2

The correct answer is:
BeH2<CaH2<BaH2

Solution:
Ionic nature ∝ size of metal ion (metallic nature).
For II group hydrides, on moving down the group metallic character of metals increases, so ionic character of metal hydride also increases.

Topic: Chemistry, s Block Elements, NEET
Among CaH2, BeH2, BaH2, what is the order of ionic character?

Options:
A BeH2<BaH2<CaH2
B CaH2<BeH2<BaH2
C BeH2<CaH2<BaH2
D BaH2<BeH2<CaH2

The correct answer is:
BeH2<CaH2<BaH2

Solution:
BeH2<CaH2<BaH2
The size of the elements follow the order: Be<Ca<Ba
Smaller the size of cation, more will be its polarizing power. Thus, a higher polarization will lead to a greater covalent character, or the least ionic character. Hence, BeH2 will be least ionic. Top to bottom size of cation increase so covalent character decrease and ionic character increases.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET, NEET 2018
Among flowers of Calotropis, Tulip, Sesbania, Asparagus, Colchicine, Sweet pea, Petunia, Indigofera, Mustard, Soybean, Tobacco and groundnut how many plants have corolla with valvate aestivation?

Options:
A Six
B Seven
C Eight
D Five

The correct answer is:
Seven

Solution:
Valvate aestivation is present in the members of Brassicaceae, Solanaceae and liliaceae family. Thus Calotropis, Tulip, Asparagus, Colchicine, Petunia, Mustard and Tobacco have valvate aestivation in corolla, but in liliaceae tepals have valvate aestivation.

Topic: Biology, Morphology of Flowering Plants, NEET
Among flowers of Calotropis, tulip, Sesbania, Asparagus, Colchicum, sweet pea, Petunia, Indigofera, mustard, soybean, tobacco and groundnut, how many plants have corolla with valvate aestivation?

Options:
A Six
B Seven
C Eight
D Five

The correct answer is:
Seven

Solution:
Valvate aestivation is found in Calotropis, tulip, Asparagus, colchicum, Petunia, mustard and tobacco. Sweet pea, groundnut, soyabean, Indigofera, Sesbania have vexillary aestivation.
Related Theory
The mode of arrangement of either sepals or petals of a flower in bud condition is said to be an Aestivation. In valvate aestivation, Sepals or petals in a whorl just meet by their edges without overlapping. In Descending imbricate or vexillary aestivation the posterior petal of overlaps one margin of the two lateral petals. (Ref. to Fig. 14.4)

Topic: Biology, Morphology of Flowering Plants, NEET, NEET 2013 (Karnataka)
Among Group 16 elements, which one does NOT show -2 oxidation state?

Options:
A Se
B Te
C Po
D O

The correct answer is:
Po

Solution:
Oxygen shows $-2,-1,+1$ and +2 oxidation states
Selenium shows $-2,+2,+4$ and +6 oxidation states
Tellurium shows $-2,+2,+4$ and +6 oxidation states
Polonium shows +2 and +4 oxidation states

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET, NEET 2024
Among halogens, which element does not show a disproportionation tendency due to its inability to exhibit positive oxidation states?

Options:
A Chlorine
B Bromine
C Fluorine
D Iodine

The correct answer is:
Fluorine

Solution:
Fluorine does not show a disproportionation tendency among halogens because it cannot exhibit positive oxidation states, as mentioned in the passage.

Topic: Chemistry, Redox Reactions, NEET
Among Himgiri, Karan Rai, Pusa Gaurav, Pusa Sem-2, Pusa Snowball k-I, Pusa A-4, Pusa Komal, how many crops are disease resistant and pest resistant, respectively?

Options:
A 3,4
B 4,3
C 2,5
D 6,1

The correct answer is:
4,3

Solution:
These all are new varieties of crops and they have some properties of resistance against disease and pest. Disease resistance plants are: 1. Himgiri is a variety of wheat 2. Karan rai is a variety of brassica crop 3.Pusa Snowball K-1 is a crop of cauliflower 4.Pusa Komal-is a new variety of cowpea
Pest resistance crops are Pusa Gaurav is a variety of Brassica, Pusa A-4 is a new variety of Okra, Pusa Sem-2 is a new variety of flat beans. So the correct answer is B.

Topic: Biology, Strategies for Enhancement in Food Production, NEET
Among (i)C6H5NH2 (ii)CH3NHCH3 (iii)(CH3)2NCH3 and (iv) NH3, the correct order of basic strength follows the order

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

The correct answer is:
(ii) > (iii) > (iv) > (i)

Solution:
The aromatic amines are less basic than aliphatic amines.
(CH3)2NCH3>CH3NHCH3>NH3>C6H5NH2

Topic: Chemistry, General Organic Chemistry, NEET
Among $\mathrm{K}, \mathrm{Ca}, \mathrm{Fe}$ and $\mathrm{Zn}$, the element which can form more than one binary compound with chlorine is:

Options:
A $\mathrm{Fe}$
B $\mathrm{Zn}$
C $\mathrm{K}$
D $\mathrm{Ca}$

The correct answer is:
$\mathrm{Fe}$

Solution:
Metal ions having variable oxidation number can form more than one types of binary compound. Fe shows $+2,+3$ oxidation states. Thus, it can form $\mathrm{FeCl}_3, \mathrm{FeCl}_2$.
Related Theory
Binary compounds are chemical compounds comprising of two distinct elements. For example, water, calcium chloride etc.
Caution
$\mathrm{Zn}$, even being a transition metal shows only +2 oxidation state, due to fully filled $3 d$ subshell.

Topic: Chemistry, d and f Block Elements, NEET, NEET 2004
Among KO2 , AlO2- , BaO2 and NO2+ , unpaired electron is present in -

Options:
A NO2+,BaO2
B KO2 and AlO2-
C KO2 only
D BaO2 only

The correct answer is:
KO2 only

Solution:
KO2 is super oxide i.e. O2- having one unpaired electron.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Among LiCl, BeCl2,BCl3 and CCl4 , the covalent bond character follows the order

Options:
A LiCl<BeCl2>BCl3>CCl4
B LiCl>BeCl2<BCl3<CCl4
C LiCl<BeCl2<BCl3<CCl4
D LiCl>BeCl2>BCl3>CCl4

The correct answer is:
LiCl<BeCl2<BCl3<CCl4

Solution:
Electro negativity differences M-Cl bond decreases as we move from Li→Be→B→C and therefore, covalent character increase in the order 'C'.
Covalent nature ∝ charge on ion.
On moving left to right across the period covalent nature increases so the order is LiCl<BeCl2<BCl3<CCl4 .

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Among LiCl, RbCl, BeCl2 and MgCl2 the compound with greatest and least ionic character respectively are

Options:
A LiCl, RbCl
B RbCl, BeCl2
C RbCl,MgCl2
D MgCl2,BeCl2

The correct answer is:
RbCl, BeCl2

Solution:
Down the group, ionic character increases so RbCl is most ionic here while BeCl2 is covalent (least ionic) compound.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Among lithium and magnesium, which element reacts slowly with water and forms a nitride by direct combination with nitrogen?

Options:
A Lithium
B Magnesium
C Both lithium and magnesium
D Neither lithium nor magnesium

The correct answer is:
Both lithium and magnesium

Solution:
Both lithium and magnesium react slowly with water and form nitrides, Li3N, and Mg3N2, by direct combination with nitrogen.

Topic: Chemistry, s Block Elements, NEET
Among lithium and magnesium, which one crystallizes from aqueous solution as the hydrate LiCl·2H2O?

Options:
A Lithium (Li)
B Magnesium (Mg)
C Both lithium and magnesium
D Neither lithium nor magnesium

The correct answer is:
Lithium (Li)

Solution:
Lithium chloride (LiCl) crystallizes from aqueous solution as the hydrate LiCl·2H2O.

Topic: Chemistry, s Block Elements, NEET
Among lithium chloride (LiCl) and magnesium chloride (MgCl2), which one is soluble in ethanol?

Options:
A LiCl
B MgCl2
C Both LiCl and MgCl2
D Neither LiCl nor MgCl2

The correct answer is:
Both LiCl and MgCl2

Solution:
Both lithium chloride (LiCl) and magnesium chloride (MgCl2) are soluble in ethanol.

Topic: Chemistry, s Block Elements, NEET
Among lithium hydroxide (LiOH) and magnesium hydroxide (Mg(OH)2), which one decomposes on heating?

Options:
A LiOH
B Mg(OH)2
C Both LiOH and Mg(OH)2
D Neither LiOH nor Mg(OH)2

The correct answer is:
Both LiOH and Mg(OH)2

Solution:
Both lithium hydroxide (LiOH) and magnesium hydroxide (Mg(OH)2) decompose on heating.

Topic: Chemistry, s Block Elements, NEET
Among [Ni(CO)4],[NiBr4]2-, [Co(NH3)4Cl2]Cl, Na3[CoF6],BaO2 and CsO2 , the total number of diamagnetic compounds is

Options:
A 5
B 3
C 4
D 2

The correct answer is:
3

Solution:
[Ni(CO)4]-sp3- Diamagnetic
[NiBr4]2--sp3- Paramagnetic
[Co(NH3)4Cl2]Cl-d2sp3- Diamagnetic
Na3[CoF6]-sp3d2- Paramagnetic
BaO2 i.e. O22-- Diamagnetic
CsO2 i.e. O2-- Paramagnetic

Topic: Chemistry, Coordination Compounds, NEET
Among NO2+ , KO2 and Na2O2 and NaAlO2 , the paramagnetism exist in-

Options:
A Na2O2 only
B KO2 and NO2+
C Na2O2 and NaAlO2
D KO2 only

The correct answer is:
KO2 only

Solution:
The electron distribution in O 2 â is :
Ï1s2 Ï2s*2 Ï2s 2Ï2s *2Ï2px 2Ï2py 2Ï2pz 2Ï2py *2Ï2pz *1
â´ O22- is diamagnetic and O2- is paramagnetic. In AlO2-, oxide ions O2- are present
and oxide ion is diamagnetic.
NO2 has one unpair electron hence paramagnetic but NO2+ has no unpair electron therefore diamagnetic

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Among NH3, H2O and HF, which would you expect to have highest magnitude of hydrogen bonding and why?

Options:
A NH3, because it has the smallest molecule size.
B H2O, because it can form multiple hydrogen bonds per molecule.
C HF, because it has the highest electronegativity and smallest size.
D None of them can form hydrogen bonds.

The correct answer is:
HF, because it has the highest electronegativity and smallest size.

Solution:
Correct Option is : (C)
HF, because it has the highest electronegativity and smallest size.

Topic: Chemistry, Hydrogen, NEET
Among $\left[\mathrm{Ni}(\mathrm{CO})_4\right],\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}\left[\mathrm{NiCl}_4\right]^{2-}$ species the hybridisation states at the $\mathrm{Ni}$ atom are respectively:
[Atomic number of $\mathrm{Ni}=28$ ]

Options:
A $s p^3, d s p^3, d s p^2$
B $s p^3, d s p^2, s p^3$
C $s p^3, s p^3, d s p^2$
D $d s p^2, s p^3, s p^3$

The correct answer is:
$s p^3, d s p^2, s p^3$

Solution:
Related Theory
The hybridization of the atomic orbitals of the central metal atom of inner orbital complex involves inner shell $d$ orbitals whereas the hybridization of the atomic orbitals of the central metal atom of outer orbital complex involves outermost shell $d$.

Topic: Chemistry, Coordination Compounds, NEET, NEET 2004
Among statement (1) – (4), the correct ones are
(1) Decomposition of hydrogen peroxide gives dioxygen.
(2) Like hydrogen perioxide, compound, such as KClO3,Pb(NO3)2 and NaNO3 when heated liberate dioxygen.
(3) 2-Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide.
(4) Hydrogen peroxide is used for the manufacture of sodium per borate.

Options:
A (1) and (3) only
B (1), (2), (3) and (4)
C (1), (3) and (4) only
D (1), (2) and (3) only

The correct answer is:
(1), (2), (3) and (4)

Solution:
All these statements are correct as on decomposition hydrogen peroxide and compounds, such as KClO3,Pb(NO3)2 and NaNO3 when heated liberate dioxygen
2H2O2→Δ2H2O+O2
2KClO3→Δ2KCl+3O2
2NaNO3→Δ2NaNO2+O2
Both 3 and 4 statements are correct as 2-Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide and hydrogen peroxide is used for the manufacture of sodium per borate.

Topic: Chemistry, s Block Elements, NEET
Among the alkali metals, which one has the lowest density?

Options:
A Lithium (Li)
B Sodium (Na)
C Potassium (K)
D Cesium (Cs)

The correct answer is:
Cesium (Cs)

Solution:
Cesium (Cs) has the lowest density among the alkali metals.

Topic: Chemistry, s Block Elements, NEET
Among the alkaline earth metal carbonates, which one has the highest thermal stability?

Options:
A Beryllium carbonate (BeCO3)
B Magnesium carbonate (MgCO3)
C Calcium carbonate (CaCO3)
D Strontium carbonate (SrCO3)

The correct answer is:
Strontium carbonate (SrCO3)

Solution:
Strontium carbonate (SrCO3) has the highest thermal stability among the alkaline earth metal carbonates. The thermal stability increases with increasing cationic size.

Topic: Chemistry, s Block Elements, NEET
Among the alkaline earth metal halides, which ones are soluble in organic solvents?

Options:
A All of them
B Only beryllium halides
C Only magnesium halides
D Only calcium halides

The correct answer is:
Only beryllium halides

Solution:
All alkaline earth metal halides are ionic in nature except for beryllium halides, which are covalent and soluble in organic solvents.

Topic: Chemistry, s Block Elements, NEET
Among the alkaline earth metal halides, which ones undergo hydrolysis when heated?

Options:
A Beryllium and Magnesium halides
B Calcium and Strontium halides
C Beryllium and Calcium halides
D Magnesium and Strontium halides

The correct answer is:
Beryllium and Calcium halides

Solution:
The corresponding hydrated halides of Beryllium and Calcium undergo hydrolysis when heated.

Topic: Chemistry, s Block Elements, NEET
Among the alkaline earth metal hydroxides, which one has the highest solubility in water?

Options:
A Beryllium hydroxide (Be(OH)2)
B Magnesium hydroxide (Mg(OH)2)
C Calcium hydroxide (Ca(OH)2)
D Barium hydroxide (Ba(OH)2)

The correct answer is:
Barium hydroxide (Ba(OH)2)

Solution:
Barium hydroxide (Ba(OH)2) has the highest solubility in water among the alkaline earth metal hydroxides. As you move down the group, the solubility of the hydroxides increases, and barium hydroxide is the most soluble due to its position at the bottom of the group.

Topic: Chemistry, s Block Elements, NEET
Among the alkaline earth metal oxides, which one has the highest melting point?

Options:
A Beryllium oxide (BeO)
B Magnesium oxide (MgO)
C Calcium oxide (CaO)
D Barium oxide (BaO)

The correct answer is:
Magnesium oxide (MgO)

Solution:
Magnesium oxide (MgO) has the highest melting point among the alkaline earth metal oxides, making it useful for high-temperature applications.

Topic: Chemistry, s Block Elements, NEET
Among the alkaline earth metal sulfates, which one forms a white precipitate when added to water due to its low solubility?

Options:
A Beryllium sulfate (BeSO4)
B Magnesium sulfate (MgSO4)
C Calcium sulfate (CaSO4)
D Barium sulfate (BaSO4)

The correct answer is:
Barium sulfate (BaSO4)

Solution:
Barium sulfate (BaSO4) forms a white precipitate when added to water due to its low solubility, making it useful for diagnostic imaging and other applications where a visible contrast is needed.

Topic: Chemistry, s Block Elements, NEET
Among the alkaline earth metal sulfates, which one has the lowest solubility in water?

Options:
A Beryllium sulfate (BeSO4)
B Magnesium sulfate (MgSO4)
C Calcium sulfate (CaSO4)
D Barium sulfate (BaSO4)

The correct answer is:
Barium sulfate (BaSO4)

Solution:
Barium sulfate (BaSO4) has the lowest solubility in water among the alkaline earth metal sulfates. It is sparingly soluble and often forms a white precipitate when added to water.

Topic: Chemistry, s Block Elements, NEET
Among the alkaline earth metals, which element has the smallest atomic radius?

Options:
A Beryllium (Be)
B Magnesium (Mg)
C Calcium (Ca)
D Barium (Ba)

The correct answer is:
Beryllium (Be)

Solution:
Among the alkaline earth metals, beryllium has the smallest atomic radius due to its higher nuclear charge and fewer electron shells.

Topic: Chemistry, s Block Elements, NEET
Among the alkaline earth metals, which one is most readily attacked by air to form the oxide and nitride?

Options:
A Beryllium (Be)
B Magnesium (Mg)
C Calcium (Ca)
D Strontium (Sr)

The correct answer is:
Calcium (Ca)

Solution:
Calcium is readily attacked by air to form the oxide (CaO) and nitride (Ca3N2).

Topic: Chemistry, s Block Elements, NEET
Among the alkaline earth metals, which one readily reacts with acids to liberate dihydrogen?

Options:
A Beryllium
B Magnesium
C Calcium
D Barium

The correct answer is:
Magnesium

Solution:
Among the alkaline earth metals, magnesium readily reacts with acids to liberate dihydrogen gas according to the equation: Mg + 2HCl → MgCl2 + H2.

Topic: Chemistry, s Block Elements, NEET
Among the carbonates of alkali metals which one has highest thermal stability?

Options:
A Cs2CO3
B Rb2CO3
C K2CO3
D Na2CO3

The correct answer is:
Cs2CO3

Solution:
On moving down the group thermal stability of alkali metal carbonate increases so Cs2CO3 is most stable here.
Cs2CO3>Rb2CO3>K2CO3>Na2CO3

Topic: Chemistry, s Block Elements, NEET
Among the carboxylic acid shown below, the ones that exhibit stereoisomerism and also form, cyclic anhydrides on heating are
(I)HOOCCH(CH3)CH2CH2COOH
(II)HOOCCH(C3H7)COOH
(III)HOOCCH(C2H5)CH2COOH
(IV)HOOCC(CH3)(C2H5)COOH

Options:
A (I) and (II)
B (I) and (III)
C (II) and (III)
D (II) and (IV)

The correct answer is:
(I) and (III)

Solution:
HOOC C * H(CH 3 )CH 2 CH 2 COOH and HOOC C * H(C 2 H 5 )CH 2 COOH both have asymmetric carbon atom ( C*= asymmetric or chiral carbon atom) so they will show optical isomerism. They will also form cyclic anhydride on heating.

Topic: Chemistry, General Organic Chemistry, NEET
Among the colloids cheese (C) , milk (M) and smoke (S), the correct combination of the dispersed phase and dispersion medium respectively are

Options:
A C: solid in liquid; M: solid in liquid; S: solid in gas
B C: solid in liquid; M: liquid in liquid; S: gas in solid
C C: liquid in solid; M: liquid in solid; S: solid in gas
D C: liquid in solid; M: liquid in liquid; S: solid in gas

The correct answer is:
C: liquid in solid; M: liquid in liquid; S: solid in gas

Solution:
Colloid	Dispersed Phase

Cheese (C)	Liquid

Milk (M)	Liquid

Smoke (S)	Solid

Topic: Chemistry, Surface Chemistry, NEET
Among the complex ions given below which is/are outer-orbital’s complex –
(I)  Co CN 6 4− II   Fe H 2 O 6 +2 III   FeF 6 3− IV   CoF 6 3−

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

The correct answer is:
II, III, IV

Solution:
H2O,F are week field ligand form outer – orbital complex.

Topic: Chemistry, Coordination Compounds, NEET
Among the compounds shown below which one revealed a linear structure?

Options:
A NO2
B HOCl
C O3
D N2O

The correct answer is:
N2O

Solution:
Other molecules nitrogen dioxide, hypochlorus acid and ozone are bent molecules.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET, NEET 2020 (Phase 2)
Among the ecosystem mentioned below, where can one find maximum biodiversity?

Options:
A Mangroves
B Desert
C Coral reefs
D Alpine meadows

The correct answer is:
Coral reefs

Solution:
Coral reefs has maximum biodiversity among above options.

Topic: Biology, Biodiversity and its Conservation, NEET