datavorous/entrance-exam-dataset huggingface dataset:
Which elements are included in the Lanthanoid series?

Options:
A Ce(Z = 58) – Lu(Z = 71)
B Th(Z = 90) – Lr (Z = 103)
C K(Z = 19) – Kr (Z = 36)
D Rb(Z = 37) – Xe (Z = 54)

The correct answer is:
Ce(Z = 58) – Lu(Z = 71)

Solution:
The Lanthanoid series includes elements from Ce (Z = 58) to Lu (Z = 71).

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which elements are included in the p-Block Elements?

Options:
A Group 1 to 12
B Group 13 to 18
C Group 16 to 20
D Group 18 to 32

The correct answer is:
Group 13 to 18

Solution:
The p-Block Elements comprise those belonging to Group 13 to 18.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which elements are included in the second period of the periodic table?

Options:
A Lithium to sodium
B Sodium to potassium
C Lithium to fluorine
D Fluorine to neon

The correct answer is:
Lithium to fluorine

Solution:
The second period includes elements from lithium to fluorine.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which elements are isotopes of each other in the above sequence of reaction?
X→-αY→-βZ→-βW

Options:
A X and W
B Y and Z
C X and Z
D None of these

The correct answer is:
X and W

Solution:
Isotopes are formed by the emission of one α- and two β- particles respectively.

Topic: Chemistry, Chemical Kinetics, NEET
Which elements are known to form a large number of complex compounds?

Options:
A Noble gases
B Alkali metals
C Transition metals
D Halogens

The correct answer is:
Transition metals

Solution:
Transition metals form a large number of complex compounds.

Topic: Chemistry, d and f Block Elements, NEET
Which elements are known to form the tetrahedral [MO4]n- ions?

Options:
A V
B Cr
C Mn
D All of the above

The correct answer is:
All of the above

Solution:
The tetrahedral [MO4]n- ions are known for V, Cr, Mn, Mn, and Mn.

Topic: Chemistry, d and f Block Elements, NEET
Which elements are likely to exhibit the expanded octet?

Options:
A Elements in the first period
B Elements in the second period
C Elements in and beyond the third period
D Elements in the third period

The correct answer is:
Elements in and beyond the third period

Solution:
The elements in and beyond the third period of the periodic table are likely to exhibit the expanded octet.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which elements are located at the top right-hand side of the Periodic Table?

Options:
A Metalloids
B Non-metals
C Semi-metals
D Metals

The correct answer is:
Non-metals

Solution:
Non-metals are located at the top right-hand side of the Periodic Table.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which elements are members of group 14?

Options:
A Carbon, silicon, germanium, tin, and lead
B Carbon, silicon, germanium, tin, lead, and flerovium
C Carbon, silicon, and flerovium
D Carbon, germanium, and lead

The correct answer is:
Carbon, silicon, germanium, tin, lead, and flerovium

Solution:
Carbon, silicon, germanium, tin, lead, and flerovium are the members of group 14.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Which elements are mentioned are highly electronegative?

Options:
A Hydrogen, helium, and neon
B Nitrogen, oxygen, and fluorine
C Carbon, silicon, and germanium
D Sodium, magnesium, and aluminum

The correct answer is:
Nitrogen, oxygen, and fluorine

Solution:
Nitrogen, oxygen, and fluorine are the highly electronegative elements.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which elements are mentioned as components of chlorophyll, haemoglobin, and vitamin B12, respectively?

Options:
A Iron, copper, cobalt
B Zinc, manganese, nickel
C Magnesium, iron, cobalt
D Sodium, potassium, calcium

The correct answer is:
Magnesium, iron, cobalt

Solution:
The paragraph specifies that chlorophyll contains magnesium, haemoglobin contains iron, and vitamin B12 contains cobalt as coordination compounds.

Topic: Chemistry, Coordination Compounds, NEET
Which elements are part of the 4f series of inner transition metals?

Options:
A Th to Lr
B Ce to Lu
C La and Hf to Hg
D Ac and elements from Rf to Cn

The correct answer is:
Ce to Lu

Solution:
The 4f series of inner transition metals includes elements from Ce to Lu.

Topic: Chemistry, d and f Block Elements, NEET
Which elements are specifically studied for their anomalous properties?

Options:
A Lanthanoid elements
B Noble gases
C Second period elements
D Transition metals

The correct answer is:
Second period elements

Solution:
The anomalous properties of the second period elements are being studied.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which elements are usually solids at room temperature?

Options:
A Metals
B Non-metals
C Metalloids
D Semi-metals

The correct answer is:
Metals

Solution:
Metals are usually solids at room temperature.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which elements are usually solids or gases at room temperature?

Options:
A Metals
B Semi-metals
C Metalloids
D Non-metals

The correct answer is:
Non-metals

Solution:
Non-metals are usually solids or gases at room temperature.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which elements have Eo values that are more negative than expected from the trend?

Options:
A Mn, Ni, and Cu
B Cu, Zn, and Fe
C Mn, Ni, and Zn
D Fe, Cu, and Ag

The correct answer is:
Mn, Ni, and Zn

Solution:
The value of Eo for Mn, Ni, and Zn are more negative than expected from the trend.

Topic: Chemistry, d and f Block Elements, NEET
Which elements have the electronic configuration (n-1)d10ns2?

Options:
A Cu, Ni, and Co
B Zn, Cd, and Hg
C Fe, Mn, and Cr
D Al, Si, and P

The correct answer is:
Zn, Cd, and Hg

Solution:
Zn, Cd, and Hg have the electronic configuration (n-1)d10ns2.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which elements head the groups in the p-block of the periodic table?

Options:
A Hydrogen, helium, and lithium
B Boron, carbon, and nitrogen
C Oxygen, fluorine, and neon
D Sodium, magnesium, and aluminum

The correct answer is:
Boron, carbon, and nitrogen

Solution:
Boron, carbon, nitrogen, oxygen, fluorine, and helium head the groups in the p-block of the periodic table.

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Which elements in Group 15 are classified as non-metals?

Options:
A Nitrogen and phosphorus
B Phosphorus and arsenic
C Bismuth and moscovium
D Nitrogen and bismuth

The correct answer is:
Nitrogen and phosphorus

Solution:
The paragraph specifies that nitrogen and phosphorus in Group 15 are non-metals.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which elements in Group 16 exhibit allotropy?

Options:
A Only oxygen and sulphur
B All elements in the group
C Only selenium and tellurium
D Only polonium

The correct answer is:
All elements in the group

Solution:
The paragraph mentions that all these elements exhibit allotropy.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which elements in the 3d series have exceptions in their electronic configurations?

Options:
A All elements in the 3d series
B Only Cr
C Only Cu
D Both Cr and Cu

The correct answer is:
Both Cr and Cu

Solution:
In the case of Cr, which has 3d54s1 configuration instead of 3d4 4s2 ; the energy gap between the two sets (3d and 4s) of orbitals is small enough to prevent electron entering the 3d orbitals. Similarly in case of Cu, the configuration is 3d104s1 and not 3d94s2 Hence, these are the exceptions.

Topic: Chemistry, d and f Block Elements, NEET
Which elements in the periodic table show a diagonal relationship?

Options:
A Elements of first period
B Elements of second period
C Elements of third period
D (B) and (C) both

The correct answer is:
(B) and (C) both

Solution:
Elements of second and third period
Diagonal relationship

Topic: Chemistry, s Block Elements, NEET
Which elements in the s-Block of the Periodic Table have predominantly ionic compounds, with exceptions?

Options:
A All s-Block elements have predominantly ionic compounds.
B Only Group 1 elements have predominantly ionic compounds.
C Only Group 2 elements have predominantly ionic compounds.
D All s-Block elements have predominantly covalent compounds.

The correct answer is:
All s-Block elements have predominantly ionic compounds.

Solution:
The compounds of the s-block elements, with the exception of those of lithium and beryllium, are predominantly ionic.

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which element's oxidation number depends on its bonding state when bonded to fluorine?

Options:
A Hydrogen
B Oxygen
C Chlorine
D Carbon

The correct answer is:
Oxygen

Solution:
The oxidation number assigned to oxygen when bonded to fluorine depends on its bonding state.

Topic: Chemistry, Redox Reactions, NEET
Which element's oxidation number is being referred to in the paragraph?

Options:
A Nitrogen
B Carbon
C Copper
D Oxygen

The correct answer is:
Copper

Solution:
The paragraph refers to the oxidation number of copper in complex ions like [Cu(CN)4]3–.

Topic: Chemistry, Coordination Compounds, NEET
Which element(s) tend to show deficiency symptoms first in the mature organs?

Options:
A Nitrogen, potassium and magnesium
B Sulphur and calcium
C Ferric ions
D Manganous ions

The correct answer is:
Sulphur and calcium

Solution:
For elements that are relatively immobile and are not transported out of the mature organs, the deficiency symptoms tend to appear first in the young tissues. For example, elements like sulphur and calcium are a part of the structural component of the cell and hence are not easily released.

Topic: Biology, Mineral Nutrition, NEET
Which end of a wedge is shown towards the observer in 3-D representation?

Options:
A Narrow end
B Broad end
C Middle
D Both ends equally

The correct answer is:
Broad end

Solution:
Wedges are shown in such a way that the broad end of the wedge is towards the observer.

Topic: Chemistry, General Organic Chemistry, NEET
Which energy levels are mentioned as having comparable energies in actinoids?

Options:
A 4f, 5d, and 6s
B 3p, 4d, and 5s
C 6p, 7d, and 5s
D 5f, 6d, and 7s

The correct answer is:
5f, 6d, and 7s

Solution:
The 5f, 6d, and 7s levels in actinoids have comparable energies.

Topic: Chemistry, d and f Block Elements, NEET
Which energy level's d–orbitals are involved in the formation of transition metals?

Options:
A The outermost energy level
B The penultimate (second-to-last) energy level
C The first energy level
D The innermost energy level

The correct answer is:
The penultimate (second-to-last) energy level

Solution:
The d–orbitals of the penultimate energy level of atoms are involved in the formation of transition metals.

Topic: Chemistry, d and f Block Elements, NEET
Which energy level's d–orbitals are typically involved in the formation of transition metals?

Options:
A The first energy level
B The second energy level
C The third energy level
D The penultimate (second-to-last) energy level

The correct answer is:
The penultimate (second-to-last) energy level

Solution:
The d–orbitals of the penultimate energy level of atoms receive electrons to form transition metals.

Topic: Chemistry, d and f Block Elements, NEET
Which enthalpy change is specifically mentioned as being compensated for by the enthalpy of lattice formation in the case of NaCl(s)?

Options:
A Ionization enthalpy
B Electron gain enthalpy
C Sum of ionization enthalpy and electron gain enthalpy
D Enthalpy of fusion

The correct answer is:
Sum of ionization enthalpy and electron gain enthalpy

Solution:
The sum of the ionization enthalpy for Na+(g) and the electron gain enthalpy for Cl- (g) is more than compensated for by the enthalpy of lattice formation of NaCl(s).

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which entity is enclosed in square brackets when writing the formula for coordination entities?

Options:
A Counter ions
B Ligands
C Central atom
D Entire coordination entity

The correct answer is:
Entire coordination entity

Solution:
The entire coordination entity, whether charged or not, is enclosed in square brackets when writing the formula.

Topic: Chemistry, Coordination Compounds, NEET
Which enzyme catalyzes the conversion of glucose into ethyl alcohol and carbon dioxide?

Options:
A Diastase
B Maltase
C Invertase
D Zymase

The correct answer is:
Zymase

Solution:
The paragraph states that the zymase enzyme converts glucose into ethyl alcohol and carbon dioxide.

Topic: Chemistry, Surface Chemistry, NEET
Which enzyme catalyzes the link reaction?

Options:
A Pyruvate carboxylase
B Malate dehydrogenase
C Pyruvate dehydrogenase
D Acetyl CoA dehydrogenase

The correct answer is:
Pyruvate dehydrogenase

Solution:
The pyruvate molecule enters the mitochondrial matrix where it is converted to acetyl-CoA by a reaction known as oxidative decarboxylation in presence of oxidizing agent NAD+. The enzyme responsible for this reaction is pyruvate dehydrogenase and the cofactor is Mg++.

Topic: Biology, Respiration in Plants, NEET
Which enzyme helped polymerize RNA with defined sequences in a template-independent manner?

Options:
A Har Gobind Khorana
B Marshall Nirenberg
C Severo Ochoa
D George Gamow

The correct answer is:
Severo Ochoa

Solution:
Severo Ochoa enzyme (polynucleotide phosphorylase) helped polymerize RNA with defined sequences in a template-independent manner.

Topic: Biology, Molecular Basis of Inheritance, NEET
Which enzyme is capable of nitrogen reduction in prokaryotes?

Options:
A Nitrogenase
B Ammonia
C Nitrite
D Nitrobacter

The correct answer is:
Nitrogenase

Solution:
The enzyme, nitrogenase which is capable of nitrogen reduction is present exclusively in prokaryotes.

Topic: Biology, Mineral Nutrition, NEET
Which enzyme is responsible for breaking down glycogen into glucose when the body needs it?

Options:
A Insulin
B Glucagon
C Amylase
D Glycogenase

The correct answer is:
Glycogenase

Solution:
Enzymes known as glycogenase are responsible for breaking down glycogen into glucose when needed.

Topic: Chemistry, Biomolecules, NEET
Which enzyme is responsible for the CO₂ fixation in the Hatch and Slack Pathway?

Options:
A RuBisCO
B Malic Acid
C Phosphoenol Pyruvate (PEP)
D PEP Carboxylase (PEPcase)

The correct answer is:
PEP Carboxylase (PEPcase)

Solution:
The enzyme responsible for the CO₂ fixation in the Hatch and Slack Pathway is PEP Carboxylase (PEPcase).

Topic: Biology, Photosynthesis in Higher Plants, NEET
Which enzyme is responsible for the conversion of inactive fibrinogens to fibrins?

Options:
A Thrombin
B Renin
C Epinephrine
D Thrombokinase

The correct answer is:
Thrombin

Solution:
Thrombin is a naturally occurring enzyme that converts fibrinogen into fibrin, which is an integral step in clot formation. In vivo thrombin is formed from prothrombin as a result of activation of both the intrinsic and extrinsic pathways of the coagulation cascade.

Topic: Biology, Body Fluids and Circulation, NEET, NEET 2021
Which enzyme of the TCA cycle or Kreb's cycle is present in the inner mitochondrial membrane?

Options:
A Pyruvate kinase
B Pyruvate dehydrogenase
C Succinate dehydrogenase
D Succinate thiokinase

The correct answer is:
Succinate dehydrogenase

Solution:
All the enzyme of the TCA cycle or Kreb's cycle are present in matrix of mitochondria except enzyme succinate dehydrogenase which is present in inner mitochondria memberane. This enzyme is also a part of ETS and is associated with complex II.

Topic: Biology, Respiration in Plants, NEET
Which enzyme should not be chosen while producing a recombinant DNA molecule ? :

Options:
A DNA ligase
B Polymerase
C Exonuclease
D Helicase

The correct answer is:
Exonuclease

Solution:
Exonuclease removes nucleotides from the end of the DNA strands.

Topic: Biology, Biotechnology - Principles and Processes, NEET
Which enzymes are likely to act on the baked potatoes eaten by a man, starting from the mouth and as it moves down the alimentary canal?

Options:
A Pancreatic amylase $\rightarrow$ Salivary amylase $\rightarrow$ Lipases
B Disaccharidase like maltase $\rightarrow$ Lipases $\rightarrow$ Nucleases
C Salivary amylase $\rightarrow$ Pancreatic amylase $\rightarrow$ Disaccharidase
D Salivary maltase $\rightarrow$ Carboxy peptidase $\rightarrow$ Trypsinogen

The correct answer is:
Salivary amylase $\rightarrow$ Pancreatic amylase $\rightarrow$ Disaccharidase

Solution:
Baked potatoes consists of starch, which is a polysaccharide. Hence, it is acted upon by salivary amylase in mouth which converts starch into maltose, isomaltose and $\alpha$ dextrin
Starch $\underset{\text { amylase }}{\stackrel{\text { Salivary }}{\longrightarrow}}$
Maltose + Isomaltose $+\alpha$-Dextrins.
Similarly, in small intestine, pancreatic amylase acts on starch to produce disaccharides maltose, isomaltose and $\alpha$ dextrin.
Starch $\underset{\alpha \text {-anylase }}{\stackrel{\text { Pancreatic }}{\longrightarrow}}$
Maltose + Isomaltose $+\alpha$-Dextrins
Then, these disacchararides are acted upon my intestinal juicesmaltase and convert it into monosaccharides.
Maltose $\stackrel{\text { Maltase }}{\longrightarrow}$ Glucose + Glucose
Related Theory
The breakdown of biomacromolecules occurs in the duodenum region of the small intestine. The simple substances thus formed are absorbed in the jejunum and ileum regions of the small intestine. The undigested and unabsorbed substances are passed on to the large intestine.
Caution
Gastric amylase appears to play a minor role in starch digestion in the stomach

Topic: Biology, Digestion and Absorption, NEET, NEET 2013 (Karnataka)
Which enzymes are not used for isolation of the DNA?

I. Cellulase
II. Lysozyme
III. DNase
IV. Lyase

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

The correct answer is:
III, IV

Solution:
Since the DNA is enclosed within the membranes, we have to break the cell open to release DNA along with other macromolecules such as RNA, proteins, polysaccharides and lipids. This can be achieved by treating the bacterial cells or plant or animal tissue with enzymes such as lysozyme (bacteria), cellulase (plant cells) and chitinase (fungus). DNase is used to break down DNA while Lyase is a class of enzyme which breaks substrate to produce double bonds.

Topic: Biology, Biotechnology - Principles and Processes, NEET
Which enzyme/s will be produced in a cell in which there is a non-sense mutation in the lac Y gene?

Options:
A B-galactosidase
B Lactose permease
C Transacetylase
D Lactose permease and transacetylase

The correct answer is:
B-galactosidase

Solution:
$\beta$-galactosidase is a structural gene present in segment of DNA, which carry lcdes for the synthesis of protein. Mutation in the lac Ygene of E.coli needs residues of cytoplasmic enzyme $\beta$-galactosidase. Lactose permease is a membrane protein, which is a major facilitator superfamily. Transacetylase is an enzyme transferring acetyl groups from one compound to another.

Topic: Biology, Molecular Basis of Inheritance, NEET, NEET 2013 (All India)
Which equation correctly represents the balanced chemical reaction involving B₂H₆ and H₂O?

Options:
A B₂H₆ + 2H₂O → 2H₃BO₃
B B₂H₆ + 3H₂O → 3H₃BO₃
C B₂H₆ + H₂O → 2H₃BO₃
D B₂H₆ + H₂O → H₃BO₃ + H₂

The correct answer is:
B₂H₆ + 2H₂O → 2H₃BO₃

Solution:
Correct Option is : (A)
B₂H₆ + 2H₂O → 2H₃BO₃

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which equation correctly represents the reaction between B₂H₆ and NH₃?

Options:
A B₂H₆ + 6NH₃ → 2BNH₆ + 6H₂
B B₂H₆ + 3NH₃ → BNH₆ + 3H₂
C 2B₂H₆ + 6NH₃ → 4BNH₆ + 6H₂
D B₂H₆ + 6NH₃ → BNH₆ + 2H₂

The correct answer is:
B₂H₆ + 6NH₃ → 2BNH₆ + 6H₂

Solution:
Correct Option is : (A)
B₂H₆ + 6NH₃ → 2BNH₆ + 6H₂

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which equation is used to calculate the pH of a buffer solution?

Options:
A Henderson-Hasselbalch equation
B Avogadro's equation
C Einstein's equation
D Newton's equation

The correct answer is:
Henderson-Hasselbalch equation

Solution:
The Henderson-Hasselbalch equation is used to calculate the pH of a buffer solution.

Topic: Chemistry, Ionic Equilibrium, NEET
Which equation represents an example of Friedel-Crafts reaction?

Options:
A C6H6+C2H5Cl→AlCl3C6H5C2H5+HCl
B C2H5OH+HCl→ZnCl2C2H5Cl+H2O
C C6H5Cl+CH3COCl→AlCl3C6H5COCH3+Cl2
D C2H5Br+Mg→etherC2H5MgBr

The correct answer is:
C6H6+C2H5Cl→AlCl3C6H5C2H5+HCl

Solution:
It is a case of Friedel crafts reaction
C2H5Cl+AlCl3→C2H5++AlCl4-

Topic: Chemistry, Hydrocarbons, NEET
Which equation represents the balanced chemical reaction between BF₃ and LiH?

Options:
A BF₃ + 2LiH → B₂H₆ + 2LiF
B BF₃ + 3LiH → B₂H₆ + 3LiF
C BF₃ + LiH → B₂H₆ + LiF
D BF₃ + 2LiH → B₂H₆ + Li₂F

The correct answer is:
BF₃ + 2LiH → B₂H₆ + 2LiF

Solution:
Correct Option is : (A)
BF₃ + 2LiH → B₂H₆ + 2LiF

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which equation represents the balanced chemical reaction between NaH and B₂H₆?

Options:
A 2NaH + B₂H₆ → 2NaBH₄
B 2NaH + B₂H₆ → Na₂BH₄ + H₂
C NaH + B₂H₆ → NaBH₄
D NaH + B₂H₆ → Na₂BH₄ + H₂

The correct answer is:
2NaH + B₂H₆ → 2NaBH₄

Solution:
Correct Option is : (A)
2NaH + B₂H₆ → 2NaBH₄

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which equation represents the change in enthalpy (∆H) during a chemical reaction?

Options:
A ∆H = qV - P∆V
B ∆H = qP - ∆U
C ∆H = H2 - H1
D ∆H = U2 - U1

The correct answer is:
∆H = H2 - H1

Solution:
The change in enthalpy (∆H) during a chemical reaction is represented as ∆H = H2 - H1.

Topic: Chemistry, Thermodynamics (C), NEET
Which equation represents the reaction between Al and NaOH?

Options:
A 2Al + 2NaOH + 6H₂O → 2Na[Al(OH)₄] + 3H₂
B 2Al + 2NaOH → 2Na[Al(OH)₄] + H₂
C Al + 2NaOH → Na₂AlO₂ + 2H₂
D 3Al + 3NaOH + 3H₂O → 3Na[Al(OH)₄] + 1.5H₂

The correct answer is:
2Al + 2NaOH + 6H₂O → 2Na[Al(OH)₄] + 3H₂

Solution:
Correct Option is : (A)
2Al + 2NaOH + 6H₂O → 2Na[Al(OH)₄] + 3H₂

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which equation represents the thermal decomposition of H₃BO₃?

Options:
A 2H₃BO₃ → B₂O₃ + 3H₂O
B H₃BO₃ → B₂O₃ + 3H₂O
C H₃BO₃ → B₂O₃ + H₂O
D 2H₃BO₃ → B₂O₃ + 2H₂O

The correct answer is:
2H₃BO₃ → B₂O₃ + 3H₂O

Solution:
Correct Option is : (A)
2H₃BO₃ → B₂O₃ + 3H₂O

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which equilibrium can be described as an acid-base reaction using the Lewis acid-base definition, but not using Bronsted-Lowry definition?

Options:
A NH3+CH3COOH⇌CH3COO-+NH4+
B H2O+CH3COOH⇌H3O++CH3COO-
C 4NH3+[Cu(H2O)4]2+⇌[Cu(NH3)4]2++4H2O
D 2NH3+H2SO4⇌2NH4++SO42-

The correct answer is:
4NH3+[Cu(H2O)4]2+⇌[Cu(NH3)4]2++4H2O

Solution:
According to Lewis acid-base concept, bases are electron pair donor and acids are electron pair acceptor. In reaction
4NH3+[Cu(H2O)4]2+⇌[Cu(NH3)4]2++4H2O
NH3 molecules donates electron pairs, so it is a Lewis base and Cu2+ accepts the electron pairs donated by the NH3 molecules, so it acts as Lewis acid.

Topic: Chemistry, Ionic Equilibrium, NEET
Which event ensures that only one sperm can fertilize an ovum?

Options:
A Spermiogenesis
B Amphimixis
C Depolarisation of oocyte plasma membrane
D Capacitation

The correct answer is:
Depolarisation of oocyte plasma membrane

Solution:
Block to polyspermy is an important step which takes place in humans (even in sea urchins) during fertilization. This is done by two events. Fast block to polyspermy takes place because of opening of sodium channels that cause the oocyte membrane to get depolarized. There is slow block to polyspermy too. This takes place due to cortical and zona reactions. These two types of block to polyspermy ensures that only one sperm can fertilise the ovum.

Topic: Biology, Human Reproduction, NEET