NEET 2022 — Chemistry

All 49 Chemistry questions we hold from this paper, of the 199 on the site for this sitting — every option and the answer key. 4 marks each, −1 for a wrong answer.

Chemistry

45 questions, one correct option each. +4 for a correct answer, −1 for a wrong one, nothing for a blank.

Q1 open Classification of Elements and Periodicity in Properties · Modern periodic table and electronic basis

The IUPAC name of an element with atomic number 119 is:

A.ununoctium
B.ununennium✓
C.unnilennium
D.unununnium

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Q2 open Biomolecules · Proteins, enzymes and vitamins

The incorrect statement regarding enzymes is:

A.Enzymes are very specific for a particular reaction and substrate
B.Enzymes are biocatalysts
C.Like chemical catalysts, enzymes reduce the activation energy of bio-processes
D.Enzymes are polysaccharides✓

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Q3 open Electrochemistry · Electrochemical cells and Nernst equation

Given below are half-cell reactions:

$Mn O_{4}^{-} + 8 H^{+} + 5 e^{-} \to M n^{2 +} + 4 H_{2} O; E_{M n^{2 +} /Mn O_{4}^{-}}^{\circ} = - 1.510 V$

$\frac{1}{2} O_{2} + 2 H^{+} + 2 e^{-} \to H_{2} O; E_{O_{2} / H_{2} O}^{\circ} = + 1.223 V$

Will the permanganate ion, $Mn O_{4}^{-}$ , liberate $O_{2}$ from water in the presence of an acid?

A.No, because $E_{ce l l}^{\circ} = - 2.733$ V
B.Yes, because $E_{ce l l}^{\circ} = + 0.287$ V✓
C.No, because $E_{ce l l}^{\circ} = - 0.287$ V
D.Yes, because $E_{ce l l}^{\circ} = + 2.733$ V

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Q4 open Hydrocarbons · Aromatic hydrocarbons: electrophilic substitution, directing effects

Which compound amongst the following is not an aromatic compound?

Question 54 as printed in the NEET 2022 booklet

A.Structure (1)✓
B.Structure (2)
C.Structure (3)
D.Structure (4)

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Q5 open Purification and Characterisation of Organic Compounds · Qualitative and quantitative analysis

Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds?

Question 55 as printed in the NEET 2022 booklet

A.Structure (1)
B.Structure (2)
C.Structure (3)
D.Structure (4)✓

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Q6 open Equilibrium · Ionic equilibrium: acids, bases, pH, buffers

The pH of the solution containing 50 mL each of 0.10 M sodium acetate and 0.01 M acetic acid is (given $p K_{a}$ of $C H_{3} COOH$ = 4.57):

A.2.57
B.5.57✓
C.3.57
D.4.57

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Q7 open

Identify the incorrect statement from the following:

A.Lithium is the strongest reducing agent among the alkali metals
B.Alkali metals react with water to form their hydroxides
C.The oxidation number of K in $K O_{2}$ is +4✓
D.Ionisation enthalpy of alkali metals decreases from top to bottom in the group

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Q8 open Organic Chemistry: Some Basic Principles and Techniques · Isomerism: structural and stereo

The incorrect statement regarding chirality is:

A.A racemic mixture shows zero optical rotation
B. $S_{N} 1$ reaction yields a 1 : 1 mixture of both enantiomers
C.The product obtained by $S_{N} 2$ reaction of a haloalkane having chirality at the reactive site shows inversion of configuration
D.Enantiomers are superimposable mirror images of each other✓

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Q9 open

Given below are two statements:

Statement I: In the coagulation of a negative sol, the flocculating power of the three given ions is in the order $A l^{3 +} > B a^{2 +} > N a^{+}$ .

Statement II: In the coagulation of a positive sol, the flocculating power of the three given salts is in the order $NaCl > N a_{2} S O_{4} > N a_{3} P O_{4}$ .

In the light of the above statements, choose the most appropriate answer from the options given below:

A.Statement I is incorrect but Statement II is correct
B.Both Statement I and Statement II are correct
C.Both Statement I and Statement II are incorrect
D.Statement I is correct but Statement II is incorrect✓

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Q10 open

Which one is not a correct mathematical equation for Dalton's law of partial pressure? Here $p$ = total pressure of the gaseous mixture.

A. $p_{i} = x_{i} p_{i}^{\circ}$ , where $x_{i}$ = mole fraction of the $i$ th gas in the mixture and $p_{i}^{\circ}$ = pressure of the $i$ th gas in the pure state✓
B. $p = p_{1} + p_{2} + p_{3}$
C. $p = n_{1} \frac{R T}{V} + n_{2} \frac{R T}{V} + n_{3} \frac{R T}{V}$
D. $p_{i} = x_{i} p$ , where $p_{i}$ = partial pressure of the $i$ th gas and $x_{i}$ = mole fraction of the $i$ th gas in the mixture

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Q11 open

Which statement regarding polymers is not correct?

A.Thermosetting polymers are reusable✓
B.Elastomers have polymer chains held together by weak intermolecular forces
C.Fibres possess high tensile strength
D.Thermoplastic polymers are capable of repeatedly softening and hardening on heating and cooling respectively

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Q12 open Chemical Bonding and Molecular Structure · Hydrogen bonding and dipole moment

Given below are two statements:

Statement I: The boiling points of the following hydrides of group 16 elements increase in the order $H_{2} O < H_{2} S < H_{2} Se < H_{2} Te$ .

Statement II: The boiling points of these hydrides increase with increase in molar mass.

In the light of the above statements, choose the most appropriate answer from the options given below:

A.Statement I is incorrect but Statement II is correct
B.Both Statement I and Statement II are correct
C.Both Statement I and Statement II are incorrect✓
D.Statement I is correct but Statement II is incorrect

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Q13 open Amines · Preparation and reactions; diazonium salts

Given below are two statements:

Statement I: Primary aliphatic amines react with $HN O_{2}$ to give unstable diazonium salts.

Statement II: Primary aromatic amines react with $HN O_{2}$ to form diazonium salts which are stable even above 300 K.

In the light of the above statements, choose the most appropriate answer from the options given below:

A.Statement I is incorrect but Statement II is correct
B.Both Statement I and Statement II are correct
C.Both Statement I and Statement II are incorrect
D.Statement I is correct but Statement II is incorrect✓

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Q14 open Aldehydes, Ketones and Carboxylic Acids · Carboxylic acids: acidity and reactions

$RMgX + C O_{2} dry ether Y H_{3} O^{+} RCOOH$

What is Y in the above reaction?

A. $(RCOO)_{2} Mg$
B. $RCO O^{-} M g^{+} X$ ✓
C. $R_{3} C O^{-} M g^{+} X$
D. $RCO O^{-} X^{+}$

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Q15 open

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): In a particular point defect, an ionic solid is electrically neutral, even if a few of its cations are missing from its unit cells.

Reason (R): In an ionic solid, Frenkel defect arises due to dislocation of a cation from its lattice site to an interstitial site, maintaining overall electrical neutrality.

In the light of the above statements, choose the most appropriate answer from the options given below:

A.(A) is not correct but (R) is correct
B.Both (A) and (R) are correct and (R) is the correct explanation of (A)
C.Both (A) and (R) are correct but (R) is not the correct explanation of (A)✓
D.(A) is correct but (R) is not correct

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Q16 open

Match List-I with List-II.

List-I (Hydrides)	List-II (Nature)
(a) $Mg H_{2}$	(i) Electron precise
(b) $Ge H_{4}$	(ii) Electron deficient
(c) $B_{2} H_{6}$	(iii) Electron rich
(d) HF	(iv) Ionic

Choose the correct answer from the options given below:

A.(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
B.(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)✓
C.(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
D.(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)

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Q17 open The p-Block Elements · Group 17 and 18: halogens, noble gases

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): ICl is more reactive than $I_{2}$ .

Reason (R): The I–Cl bond is weaker than the I–I bond.

In the light of the above statements, choose the most appropriate answer from the options given below:

A.(A) is not correct but (R) is correct
B.Both (A) and (R) are correct and (R) is the correct explanation of (A)✓
C.Both (A) and (R) are correct but (R) is not the correct explanation of (A)
D.(A) is correct but (R) is not correct

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Q18 open

Match List-I with List-II.

List-I	List-II
(a) Li	(i) Absorbent for carbon dioxide
(b) Na	(ii) Electrochemical cells
(c) KOH	(iii) Coolant in fast breeder reactors
(d) Cs	(iv) Photoelectric cell

Choose the correct answer from the options given below:

A.(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)✓
B.(a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
C.(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
D.(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)

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Q19 open

Match List-I with List-II.

List-I (Drug class)	List-II (Drug molecule)
(a) Antacids	(i) Salvarsan
(b) Antihistamines	(ii) Morphine
(c) Analgesics	(iii) Cimetidine
(d) Antimicrobials	(iv) Seldane

Choose the correct answer from the options given below:

A.(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
B.(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
C.(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)✓
D.(a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)

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Q20 open Structure of Atom · Quantum numbers, orbitals and their shapes

Identify the incorrect statement from the following:

A.The shapes of $d_{x y}$ , $d_{y z}$ and $d_{z x}$ orbitals are similar to each other; and $d_{x^{2} - y^{2}}$ and $d_{z^{2}}$ are similar to each other✓
B.All the five 5d orbitals are different in size when compared to the respective 4d orbitals
C.All the five 4d orbitals have shapes similar to the respective 3d orbitals
D.In an atom, all the five 3d orbitals are equal in energy in the free state

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Q21 open The p-Block Elements · Group 13 and 14 elements

Choose the correct statement:

A.Both diamond and graphite are used as dry lubricants
B.Diamond and graphite have two-dimensional networks
C.Diamond is covalent and graphite is ionic
D.Diamond is $s p^{3}$ hybridised and graphite is $s p^{2}$ hybridised✓

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Q22 open Chemical Bonding and Molecular Structure · Molecular orbital theory

Which amongst the following is an incorrect statement?

A. $O_{2}^{+}$ ion is diamagnetic✓
B.The bond orders of $O_{2}^{+}$ , $O_{2}$ , $O_{2}^{-}$ and $O_{2}^{2 -}$ are 2.5, 2, 1.5 and 1, respectively
C.The $C_{2}$ molecule has four electrons in its two degenerate $π$ molecular orbitals
D. $H_{2}^{+}$ ion has one electron

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Q23 open Solutions · Concentration terms, Henry's and Raoult's laws

In a one molal solution that contains 0.5 mole of a solute, there is:

A.1000 g of solvent
B.500 mL of solvent
C.500 g of solvent✓
D.100 mL of solvent

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Q24 open Alcohols, Phenols and Ethers · Acidity and reactions of phenols

Given below are two statements:

Statement I: The acidic strength of monosubstituted nitrophenol is higher than that of phenol because of the electron-withdrawing nitro group.

Statement II: o-Nitrophenol, m-nitrophenol and p-nitrophenol will have the same acidic strength as they have one nitro group attached to the phenolic ring.

In the light of the above statements, choose the most appropriate answer from the options given below:

A.Statement I is incorrect but Statement II is correct
B.Both Statement I and Statement II are correct
C.Both Statement I and Statement II are incorrect
D.Statement I is correct but Statement II is incorrect✓

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Q25 open Thermodynamics · First law, enthalpy and Hess's law

Which of the following $p$ – $V$ curves represents maximum work done?

Question 75 as printed in the NEET 2022 booklet

A.Curve (1)
B.Curve (2)
C.Curve (3)✓
D.Curve (4)

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Q26 open Some Basic Concepts of Chemistry · Stoichiometry and limiting reagent

What mass of 95% pure $CaC O_{3}$ will be required to neutralise 50 mL of 0.5 M HCl solution according to the following reaction? (Calculate up to the second place of decimal.)

$CaC O_{3} (s) + 2HCl (aq) \to CaC l_{2} (aq) + C O_{2} (g) + 2 H_{2} O (l)$

A.9.50 g
B.1.25 g
C.1.32 g✓
D.3.65 g

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Q27 open Haloalkanes and Haloarenes · Haloarenes: reactions and directing effects

Which of the following sequences of reactions is suitable to synthesise chlorobenzene?

Question 77 as printed in the NEET 2022 booklet

A.Sequence (1)
B.Benzene, $C l_{2}$ , anhydrous $FeC l_{3}$ ✓
C.Phenol, $NaN O_{2}$ , HCl, CuCl
D.Sequence (4)

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Q28 open The p-Block Elements · Group 13 and 14 elements

Which of the following statements is not correct about diborane?

A.Both the boron atoms are $s p^{2}$ hybridised✓
B.There are two 3-centre-2-electron bonds
C.The four terminal B–H bonds are two-centre two-electron bonds
D.The four terminal hydrogen atoms and the two boron atoms lie in one plane

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Q29 open Aldehydes, Ketones and Carboxylic Acids · Nucleophilic addition reactions

Match List-I with List-II.

List-I (Product formed)	List-II (Reaction of carbonyl compound with)
(a) Cyanohydrin	(i) $N H_{2} OH$
(b) Acetal	(ii) $RN H_{2}$
(c) Schiff's base	(iii) Alcohol
(d) Oxime	(iv) HCN

Choose the correct answer from the options given below:

A.(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)✓
B.(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
C.(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
D.(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)

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Q30 open Electrochemistry · Electrochemical cells and Nernst equation

At 298 K, the standard electrode potentials of $C u^{2 +} /Cu$ , $Z n^{2 +} /Zn$ , $F e^{2 +} /Fe$ and $A g^{+} /Ag$ are 0.34 V, –0.76 V, –0.44 V and 0.80 V, respectively. On the basis of standard electrode potential, predict which of the following reactions cannot occur:

A. $2CuS O_{4} (aq) + 2Ag (s) \to 2Cu (s) + A g_{2} S O_{4} (aq)$ ✓
B. $CuS O_{4} (aq) + Zn (s) \to ZnS O_{4} (aq) + Cu (s)$
C. $CuS O_{4} (aq) + Fe (s) \to FeS O_{4} (aq) + Cu (s)$
D. $FeS O_{4} (aq) + Zn (s) \to ZnS O_{4} (aq) + Fe (s)$

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Q31 open Aldehydes, Ketones and Carboxylic Acids · Nucleophilic addition reactions

Given below are two statements:

Statement I: The boiling points of aldehydes and ketones are higher than those of hydrocarbons of comparable molecular masses because of weak molecular association in aldehydes and ketones due to dipole–dipole interactions.

Statement II: The boiling points of aldehydes and ketones are lower than those of alcohols of similar molecular masses due to the absence of H-bonding.

In the light of the above statements, choose the most appropriate answer from the options given below:

A.Statement I is incorrect but Statement II is correct
B.Both Statement I and Statement II are correct✓
C.Both Statement I and Statement II are incorrect
D.Statement I is correct but Statement II is incorrect

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Q32 open Chemical Bonding and Molecular Structure · VSEPR and molecular shapes

Amongst the following, which one will have maximum 'lone pair – lone pair' electron repulsions?

A. $Xe F_{2}$ ✓
B. $Cl F_{3}$
C. $I F_{5}$
D. $S F_{4}$

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Q33 open Coordination Compounds · Nomenclature and Werner's theory

The IUPAC name of the complex $[Ag (H_{2} O)_{2}] [Ag (CN)_{2}]$ is:

A.diaquasilver(I) dicyanidoargentate(I)✓
B.dicyanidosilver(II) diaquaargentate(II)
C.diaquasilver(II) dicyanidoargentate(II)
D.dicyanidosilver(I) diaquaargentate(I)

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Q34 open The d- and f-Block Elements · Lanthanoids and actinoids

Gadolinium has a low value of third ionisation enthalpy because of:

A.High basic character
B.Small size
C.High exchange enthalpy✓
D.High electronegativity

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Q35 open Chemical Kinetics · Rate law, order and molecularity

The given graph is a representation of the kinetics of a reaction. The $y$ and $x$ axes for zero and first order reactions, respectively, are:

Question 85 as printed in the NEET 2022 booklet

A.Zero order ( $y$ = rate and $x$ = concentration), first order ( $y$ = rate and $x$ = $t_{1/2}$ )
B.Zero order ( $y$ = concentration and $x$ = time), first order ( $y$ = $t_{1/2}$ and $x$ = concentration)
C.Zero order ( $y$ = concentration and $x$ = time), first order ( $y$ = rate constant and $x$ = concentration)
D.Zero order ( $y$ = rate and $x$ = concentration), first order ( $y$ = $t_{1/2}$ and $x$ = concentration)✓

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Q36 open Structure of Atom · Bohr model and hydrogen spectrum

If the radius of the second Bohr orbit of the $H e^{+}$ ion is 105.8 pm, what is the radius of the third Bohr orbit of the $L i^{2 +}$ ion?

A.158.7 Å
B.158.7 pm✓
C.15.87 pm
D.1.587 pm

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Q37 open

Match List-I with List-II.

List-I (Ores)	List-II (Composition)
(a) Haematite	(i) $F e_{3} O_{4}$
(b) Magnetite	(ii) $ZnC O_{3}$
(c) Calamine	(iii) $F e_{2} O_{3}$
(d) Kaolinite	(iv) $[A l_{2} (OH)_{4} S i_{2} O_{5}]$

Choose the correct answer from the options given below:

A.(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
B.(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
C.(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)✓
D.(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)

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Q38 open Organic Chemistry: Some Basic Principles and Techniques · IUPAC nomenclature

The correct IUPAC name of the following compound is:

Question 89 as printed in the NEET 2022 booklet

A.6-bromo-4-methyl-2-chlorohexan-4-ol
B.1-bromo-5-chloro-4-methylhexan-3-ol✓
C.6-bromo-2-chloro-4-methylhexan-4-ol
D.1-bromo-4-methyl-5-chlorohexan-3-ol

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Q39 open Aldehydes, Ketones and Carboxylic Acids · Named reactions: aldol, Cannizzaro, Clemmensen, Wolff–Kishner

Which one of the following is not formed when acetone reacts with 2-pentanone in the presence of dilute NaOH followed by heating?

Question 90 as printed in the NEET 2022 booklet

A.Structure (1)
B.Structure (2)
C.Structure (3)✓
D.Structure (4)

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Q40 open Hydrocarbons · Alkenes and alkynes: addition reactions, Markovnikov

Compound X on reaction with $O_{3}$ followed by $Zn/ H_{2} O$ gives formaldehyde and 2-methylpropanal as products. The compound X is:

A.Pent-2-ene
B.3-Methylbut-1-ene✓
C.2-Methylbut-1-ene
D.2-Methylbut-2-ene

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Q41 open Chemical Kinetics · Integrated rate equations and half-life

For a first order reaction A → Products, the initial concentration of A is 0.1 M, which becomes 0.001 M after 5 minutes. The rate constant for the reaction in $mi n^{- 1}$ is:

A.0.2303
B.1.3818
C.0.9212✓
D.0.4606

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Q42 open Equilibrium · Law of mass action, Kc and Kp, Le Chatelier

$3 O_{2} (g) ⇌ 2 O_{3} (g)$

For the above reaction at 298 K, $K_{c}$ is found to be $3.0 \times 1 0^{- 59}$ . If the concentration of $O_{2}$ at equilibrium is 0.040 M, then the concentration of $O_{3}$ in M is:

A. $1.2 \times 1 0^{21}$
B. $4.38 \times 1 0^{- 32}$ ✓
C. $1.9 \times 1 0^{- 63}$
D. $2.4 \times 1 0^{31}$

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Q43 open

The pollution due to oxides of sulphur gets enhanced due to the presence of:

(a) particulate matter

(b) ozone

(d) hydrogen peroxide

Choose the most appropriate answer from the options given below:

A.(a), (c), (d) only
B.(a), (d) only
C.(a), (b), (d) only✓
D.(b), (c), (d) only

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Q44 open Amines · Preparation and reactions; diazonium salts

The product formed from the following reaction sequence is:

Question 95 as printed in the NEET 2022 booklet

A.Structure (1)✓
B.Structure (2)
C.Structure (3)
D.Structure (4)

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Q45 open The d- and f-Block Elements · Potassium dichromate and permanganate

In neutral or faintly alkaline medium, $KMn O_{4}$ oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from:

A.+6 to +5
B.+7 to +4✓
C.+6 to +4
D.+7 to +3

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Q46 open Alcohols, Phenols and Ethers · Preparation and reactions of alcohols

Given below are two statements:

Statement I: In the Lucas test, primary, secondary and tertiary alcohols are distinguished on the basis of their reactivity with conc. HCl + $ZnC l_{2}$ , known as Lucas reagent.

Statement II: Primary alcohols are the most reactive and immediately produce turbidity at room temperature on reaction with Lucas reagent.

In the light of the above statements, choose the most appropriate answer from the options given below:

A.Statement I is incorrect but Statement II is correct
B.Both Statement I and Statement II are correct
C.Both Statement I and Statement II are incorrect
D.Statement I is correct but Statement II is incorrect✓

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Q47 open Coordination Compounds · Valence bond and crystal field theory

The order of energy absorbed, which is responsible for the colour of the complexes

(A) $[Ni (H_{2} O)_{2} (en)_{2}]^{2 +}$

(B) $[Ni (H_{2} O)_{4} (en)]^{2 +}$ and

is:

A.(B) > (A) > (C)
B.(A) > (B) > (C)
C.(C) > (B) > (A)
D.(C) > (A) > (B)✓

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Q48 open

A 10.0 L flask contains 64 g of oxygen at 27 °C (assume $O_{2}$ gas is behaving ideally). The pressure inside the flask in bar is (given $R = 0.0831 L bar K^{- 1} mo l^{- 1}$ ):

A.4.9✓
B.2.5
C.498.6
D.49.8

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Q49 open

Copper crystallises in an fcc unit cell with cell edge length of $3.608 \times 1 0^{- 8}$ cm. The density of copper is $8.92 g c m^{- 3}$ . Calculate the atomic mass of copper.

A.65 u
B.63.1 u✓
C.31.55 u
D.60 u

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