Neet Chemistry [2024]

Question 1

Spin only' magnetic moment is same for which of the following ions?
A. Ti³⁺
B. Cr²⁺
C. Mn²⁺
D. Fe²⁺
E. Sc³⁺
Choose the most appropriate answer from the options given below:

Accepted Answer

B and D only

Answer

A and E only

Answer

B and C only

Answer

A and D only

Question 2

The most stable carbocation among the following is:

Accepted Answer

D

Answer

Answer

Answer

Answer

Question 3

Given below are two statements:
Statement I: The boiling point of hydrides of Group-16 elements follow the order H₂O > H₂Te > H₂Se > H₂S.
Statement II: On the basis of molecular mass, H₂O is expected to have lower boiling point than the other members of the group but due to the presence of extensive H-bonding in H₂O, it has higher boiling point.
In the light of the above statements, choose the correct answer from the options given below:

Accepted Answer

Both statement-I and Statement-II are true

Answer

Both statement-I and Statement-II are false

Answer

Statement-I is true but Statement-II is false

Answer

Statement-I is false but Statement-II is true

Question 4

Match List I with List II:
List I (Compound) - List II (Shape/geometry)
A. NH₃ - I. Trigonal Pyramidal
B. BrF₅ - II. Square Planar
C. XeF₄ - III. Octahedral
D. SF₆ - IV. Square Pyramidal
Choose the correct answer from the options given below:

Accepted Answer

A-I, B-IV, C-II, D-III

Answer

A-II, B-IV, C-III, D-I

Answer

A-III, B-IV, C-I, D-II

Answer

A-II, B-III, C-IV, D-I

Question 5

The highest number of helium atoms is in:

Accepted Answer

4 mol of helium

Answer

4 u of helium

Answer

4 g of helium

Answer

2.271098 L of helium at STP

Question 6

Identify the correct reagents that would bring about the following transformation:

Accepted Answer

(i) BH₃ (ii) H₂O₂/OH⁻ (iii) PCC

Answer

(i) H₂O/H⁺ (ii) CrO₃

Answer

(i) BH₃ (ii) H₂O₂/OH⁻ (iii) Alk. KMnO₄ (iv) H₃O⁺

Answer

(i) H₂O/H⁺ (ii) PCC

Question 7

Match List I with List II:
List I (Process) - List II (Conditions)
A. Isothermal process - I. No heat exchange
B. Isochoric process - II. Carried out at constant temperature
C. Isobaric process - III. Carried out at constant volume
D. Adiabatic process - IV. Carried out at constant pressure
Choose the correct answer from the options given below:

Accepted Answer

A-II, B-III, C-IV, D-I

Answer

A-IV, B-III, C-II, D-I

Answer

A-IV, B-II, C-III, D-I

Answer

A-I, B-II, C-III, D-IV

Question 8

Which one of the following alcohols reacts instantaneously with Lucas reagent?

Accepted Answer

4

Answer

1

Answer

2

Answer

3

Question 9

In which of the following equilibria, Kp and Kc are NOT equal?

Accepted Answer

PCl₅(g) ⇌ PCl₃(g) + Cl₂(g)

Answer

H₂(g) + I₂(g) ⇌ 2HI(g)

Answer

CO(g) + H₂O(g) ⇌ CO₂(g) + H₂(g)

Answer

2BrCl(g) ⇌ Br₂(g) + Cl₂(g)

Question 10

Match List I with List II:
List I (Quantum Number) - List II (Information provided)
A. mℓ - I. shape of orbital
B. ms - II. size of orbital
C. ℓ - III. orientation of orbital
D. n - IV. orientation of spin of electron
Choose the correct answer from the options given below:

Accepted Answer

A-III, B-IV, C-I, D-II

Answer

A-I, B-III, C-II, D-IV

Answer

A-III, B-IV, C-II, D-I

Answer

A-II, B-I, C-IV, D-III

Question 11

Given below are two statements:
Statement I: Aniline does not undergo Friedel-Crafts alkylation reaction
Statement II: Aniline cannot be prepared through Gabriel synthesis.
In the light of the above statements, choose the correct answer from the options given below:

Accepted Answer

Both Statement I and Statement II are true

Answer

Both Statement I and Statement II are false

Answer

Statement I is correct but Statement II is false

Answer

Statement I is incorrect but Statement II is true

Question 12

Intramolecular hydrogen bonding is present in:

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 13

On heating, some solid substances change from solid to vapour state without passing through liquid state. The technique used for the purification of such solid substances based on the above principle is known as:

Accepted Answer

Sublimation

Answer

Crystallization

Answer

Distillation

Answer

Chromatography

Question 14

In which of the following processes entropy increases?
A. A liquid evaporates to vapour
B. Temperature of a crystalline solid lowered from 130 K to 0K
C. 2NaHCO₃(s) → Na₂CO₃(s) + CO₂(g) + H₂O(g)
D. Cl₂(g) → 2Cl(g)
Choose the correct answer from the options given below:

Accepted Answer

A, C and D

Answer

A and C

Answer

A, B and D

Answer

C and D

Question 15

Among Group 16 elements, which one does NOT show -2 oxidation state?

Accepted Answer

Po

Answer

O

Answer

Se

Answer

Te

Question 16

Match List-I with List-II:
List-I (Conversion)                         List-II (No. of Faraday required)
A. 1 mol of H₂O to O₂                                  I. 3F
B. 1 mol of MnO₄⁻ to Mn²⁺                       II. 2F
C. 1.5 mole of Ca from molten CaCl₂    III. 1F
D. 1 mol of FeO to Fe₂O₃                          IV. 5F
Choose the correct answer from the options given below:

Accepted Answer

A-II, B-IV, C-I, D-III

Answer

A-III, B-IV, C-I, D-II

Answer

A-II, B-III, C-I, D-IV

Answer

A-III, B-IV, C-II, D-I

Question 17

Arrange the following elements in increasing order of electronegativity:
N, O, F, C, Si
Choose the correct answer from the options given below:

Accepted Answer

Si < C < N < O < F

Answer

Si < C < O < N < F

Answer

O < F < N < C < Si

Answer

F < O < N < C < Si

Question 18

A compound with a molecular formula of C₆H₁₄ has two tertiary carbons. Its IUPAC name is:

Accepted Answer

2,3-dimethylbutane

Answer

n-hexane

Answer

2-methylpentane

Answer

2,2-dimethylbutane

Question 19

Fehling's solution 'A' is:

Accepted Answer

aqueous copper sulphate

Answer

alkaline copper sulphate

Answer

alkaline solution of sodium potassium tartrate (Rochelle's salt)

Answer

aqueous sodium citrate

Question 20

Activation energy of any chemical reaction can be calculated if one knows the value of:

Accepted Answer

rate constant at two different temperatures

Answer

rate constant at standard temperature

Answer

probability of collision

Answer

orientation of reactant molecules during collision

Question 21

The correct order of acidity of the following compounds is:

Accepted Answer

4

Answer

1

Answer

2

Answer

3

Question 22

Match List I with List II:
Choose the correct answer from the options given below:

Accepted Answer

A-IV, B-I, C-II, D-III

Answer

A-IV, B-I, C-III, D-II

Answer

A-III, B-I, C-II, D-IV

Answer

A-I, B-IV, C-II, D-III

Question 23

The compound that will undergo SN1 reaction with the fastest rate is:

Accepted Answer

4

Answer

1

Answer

2

Answer

3

Question 24

Which reaction is NOT a redox reaction?

Accepted Answer

BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl

Answer

Zn + CuSO₄ → ZnSO₄ + Cu

Answer

2KClO₃ + I₂ → 2KIO₃ + Cl₂

Answer

H₂ + Cl₂ → 2HCl

Question 25

Given below are two statements:
Statement I: The boiling point of three isomeric pentanes follows the order n-pentane > isopentane > neopentane
Statement II: When branching increases, the molecule attains a shape of sphere. This results in smaller surface area for contact, due to which the intermolecular forces between the spherical molecules are weak, thereby lowering the boiling point.
In the light of the above statements, choose the most appropriate answer from the options given below:

Accepted Answer

Both statement I and Statement II are correct

Answer

Both Statement I and Statement II are incorrect

Answer

Statement I is correct but Statement II is incorrect

Answer

Statement I is incorrect but Statement II is correct

Question 26

Given below are two statements:
Statement I: Both [Co(NH₃)₆]³⁺ and [CoF₆]³⁻ complexes are octahedral but differ in their magnetic behaviour.
Statement II: [Co(NH₃)₆]³⁺ is diamagnetic whereas [CoF₆]³⁻ is paramagnetic.
In the light of the above statements, choose the correct answer from the options given below:

Accepted Answer

Both statement I and Statement II are true

Answer

Both Statement I and Statement II are false

Answer

Statement I is true but Statement II is false

Answer

Statement I is false but Statement II is true

Question 27

Match List I with List II:
List I (Molecule) -                 List II (Number and types of bond/s.                                                          between two carbon atoms)
A. ethane.                           I. one σ-bond and two π-bonds
B. ethene                            II. two π-bonds
C. carbon molecule, C₂   III. one σ-bond
D. ethyne                            IV. one σ-bond and one π-bond
Choose the correct answer from the options given below:

Accepted Answer

A-III, B-IV, C-II, D-I

Answer

A-I, B-IV, C-II, D-III

Answer

A-IV, B-III, C-II, D-I

Answer

A-III, B-IV, C-I, D-II

Question 28

The Henry's law constant (K_H) values of three gases (A, B, C) in water are 145, 2×10⁻⁵ and 35 kbar, respectively. The solubility of these gases in water follow the order:

Accepted Answer

B > C > A

Answer

B > A > C

Answer

A > C > B

Answer

A > B > C

Question 29

The energy of an electron in the ground state (n = 1) for He⁺ ion is -x J, then that for an electron in n = 2 state for Be³⁺ ion in J is:

Accepted Answer

-x

Answer

-x/9

Answer

-4x

Answer

-4x/9

Question 30

The E° value for the Mn³⁺/Mn²⁺ couple is more positive than that of Cr³⁺/Cr²⁺ or Fe³⁺/Fe²⁺ due to change of:

Accepted Answer

d⁴ to d⁵ configuration

Answer

d⁵ to d⁴ configuration

Answer

d⁵ to d² configuration

Answer

d³ to d⁵ configuration

Question 31

The reagents with which glucose does not react to give the corresponding tests/products are:
A. Tollen's reagent
B. Schiff's reagent
C. HCN
D. NH₂OH
E. NaHSO₃
Choose the correct options from the given below:

Accepted Answer

B and E

Answer

B and C

Answer

A and D

Answer

E and D

Question 32

Match List I with List II:
List I (Complex) - List II (Type of isomerism)
A. [Co(NH₃)₅(NO₂)]Cl₂ - I. Solvate isomerism
B. [Co(NH₃)₅(SO₄)]Br - II. Linkage isomerism
C. [Co(NH₃)₆][Cr(CN)₆] - III. Ionization isomerism
D. [Co(H₂O)₆]Cl₃ - IV. Coordination isomerism
Choose the correct answer from the options given below:

Accepted Answer

A-II, B-III, C-IV, D-I

Answer

A-I, B-III, C-IV, D-II

Answer

A-I, B-IV, C-III, D-II

Answer

A-II, B-IV, C-III, D-I

Question 33

Arrange the following elements in increasing order of first ionization enthalpy:
Li, Be, B, C, N
Choose the correct answer from the options given below:

Accepted Answer

Li < B < Be < C < N

Answer

Li < Be < B < C < N

Answer

Li < Be < C < B < N

Answer

Li < Be < N < B < C

Question 34

1 gram of sodium hydroxide was treated with 25 mL of 0.75 M HCl solution, the mass of sodium hydroxide left unreacted is equal to:

Accepted Answer

250 mg

Answer

750 mg

Answer

Zero mg

Answer

200 mg

Question 35

For the reaction 2A ⇌ B + C, Kc = 4×10⁻³. At a given time, the composition of reaction mixture is: [A] = [B] = [C] = 2×10⁻³ M. Then, which of the following is correct?

Accepted Answer

Reaction has a tendency to go in backward direction

Answer

Reaction is at equilibrium

Answer

Reaction has a tendency to go in forward direction

Answer

Reaction has gone to completion in forward direction

Question 36

Given below are certain cations. Using inorganic qualitative analysis, arrange them in increasing group number from 0 to VI:
A. Al³⁺
B. Cu²⁺
C. Ba²⁺
D. Co²⁺
E. Mg²⁺
Choose the correct answer from the options given below:

Accepted Answer

B, A, D, C, E

Answer

B, C, A, D, E

Answer

E, C, D, B, A

Answer

E, A, B, C, D

Question 37

The products A and B obtained in the following reactions, respectively, are:
3ROH + PCl₃ → 3RCl + A
ROH + PCl₅ → RCl + HCl + B

Accepted Answer

H₃PO₃ and POCl₃

Answer

POCl₃ and H₃PO₃

Answer

POCl₃ and H₃PO₄

Answer

H₃PO₄ and POCl₃

Question 38

Mass in grams of copper deposited by passing 9.6487 A current through a voltmeter containing copper sulphate solution for 100 seconds is:
(Given: Molar mass of Cu: 63 g mol⁻¹, 1F = 96487 C)

Accepted Answer

0.315 g

Answer

3.15 g

Answer

31.5 g

Answer

0.0315 g

Question 39

The plot of osmotic pressure (Π) vs concentration (mol L⁻¹) for a solution gives a straight line with slope 25.73 L bar mol⁻¹. The temperature at which the osmotic pressure measurement is done is:
(Use R = 0.083 L bar mol⁻¹ K⁻¹)

Accepted Answer

37°C

Answer

310°C

Answer

25.73°C

Answer

12.05°C

Question 40

Identify the major product C formed in the following reaction sequence:

Accepted Answer

propylamine

Answer

butylamine

Answer

butanamide

Answer

α-bromobutanoic acid

Question 41

Identify the correct answer:

Accepted Answer

Three canonical forms can be drawn for CO₃²⁻ ion

Answer

Three resonance structures can be drawn for ozone

Answer

BF₃ has non-zero dipole moment

Answer

Dipole moment of NF₃ is greater than that of NH₃

Question 42

Given below are two statements:
Statement I: [Co(NH₃)₆]³⁺ is a homoleptic complex whereas [Co(NH₃)₄Cl₂]⁺ is a heteroleptic complex.
Statement II: Complex [Co(NH₃)₆]³⁺ has only one kind of ligands but [Co(NH₃)₄Cl₂]⁺ has more than one kind of ligands.
In the light of the above statements, choose the correct answer from the options given below:

Accepted Answer

Both Statement I and Statement II are true

Answer

Both Statement I and Statement II are false

Answer

Statement I is true but Statement II is false

Answer

Statement I is false but Statement II is true

Question 43

For the given reaction:
'P' is:

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 44

The pair of lanthanoid ions which are diamagnetic is:

Accepted Answer

Ce⁴⁺ and Yb²⁺

Answer

Ce³⁺ and Eu²⁺

Answer

Gd³⁺ and Eu³⁺

Answer

Pm³⁺ and Sm³⁺

Question 45

Consider the following reaction in a sealed vessel at equilibrium with concentrations of N₂ = 3.0×10⁻³ M, O₂ = 4.2×10⁻³ M and NO = 2.8×10⁻³ M:
2NO(g) ⇌ N₂(g) + O₂(g)
If 0.1 mol L⁻¹ of NO(g) is taken in a closed vessel, what will be degree of dissociation (α) of NO(g) at equilibrium?

Accepted Answer

0.717

Answer

0.00889

Answer

0.0889

Answer

0.8889

Question 46

A compound X contains 32% of A, 20% of B and remaining percentage of C. Then, the empirical formula of X is:
Given atomic masses of A = 64; B = 40; C = 32 u

Accepted Answer

ABC₃

Answer

A₂BC₂

Answer

AB₂C₂

Answer

ABC₄

Question 47

The work done during reversible isothermal expansion of one mole of hydrogen gas at 25°C from pressure of 20 atmosphere to 10 atmosphere is:
Given R = 2.0 cal K⁻¹ mol⁻¹

Accepted Answer

-413.14 calories

Answer

0 calorie

Answer

413.14 calories

Answer

100 calories

Question 48

The acid used for the preparation of hydrogen sulphide is:

Accepted Answer

dilute sulphuric acid

Answer

dilute hydrochloric acid

Answer

concentrated sulphuric acid

Answer

dilute nitric acid

Question 49

The rate of a reaction quadruples when temperature changes from 27°C to 57°C. Calculate the energy of activation.
Given R = 8.314 J K⁻¹ mol⁻¹, log 4 = 0.6021

Accepted Answer

38.04 kJ/mol

Answer

380.4 kJ/mol

Answer

3.80 kJ/mol

Answer

3804 kJ/mol

Question 50

Major products A and B formed in the following reaction sequence, are:

Accepted Answer

1

Answer

2

Answer

3

Answer

4

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