Neet Chemistry [2024]

Q1: 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:

• B and D only
• A and E only
• B and C only
• A and D only

Q2: The most stable carbocation among the following is:

Q3: 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:

• Both statement-I and Statement-II are true
• Both statement-I and Statement-II are false
• Statement-I is true but Statement-II is false
• Statement-I is false but Statement-II is true

Q4: 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:

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

Q5: The highest number of helium atoms is in:

• 4 mol of helium
• 4 u of helium
• 4 g of helium
• 2.271098 L of helium at STP

Q6: Identify the correct reagents that would bring about the following transformation:

• (i) H₂O/H⁺ (ii) CrO₃
• (i) BH₃ (ii) H₂O₂/OH⁻ (iii) PCC
• (i) BH₃ (ii) H₂O₂/OH⁻ (iii) Alk. KMnO₄ (iv) H₃O⁺
• (i) H₂O/H⁺ (ii) PCC

Q7: 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:

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

Q8: Which one of the following alcohols reacts instantaneously with Lucas reagent?

• 1
• 2
• 3
• 4

Q9: In which of the following equilibria, Kp and Kc are NOT equal?

• PCl₅(g) ⇌ PCl₃(g) + Cl₂(g)
• H₂(g) + I₂(g) ⇌ 2HI(g)
• CO(g) + H₂O(g) ⇌ CO₂(g) + H₂(g)
• 2BrCl(g) ⇌ Br₂(g) + Cl₂(g)

Q10: 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:

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

Q11: 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:

• Both Statement I and Statement II are true
• Both Statement I and Statement II are false
• Statement I is correct but Statement II is false
• Statement I is incorrect but Statement II is true

Q12: Intramolecular hydrogen bonding is present in:

• 1
• 2
• 3
• 4

Q13: 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:

• Crystallization
• Sublimation
• Distillation
• Chromatography

Q14: 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:

• A and C
• A, B and D
• A, C and D
• C and D

Q15: Among Group 16 elements, which one does NOT show -2 oxidation state?

• O
• Se
• Te
• Po

Q16: 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:

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

Q17: Arrange the following elements in increasing order of electronegativity: N, O, F, C, Si Choose the correct answer from the options given below:

• Si < C < N < O < F
• Si < C < O < N < F
• O < F < N < C < Si
• F < O < N < C < Si

Q18: A compound with a molecular formula of C₆H₁₄ has two tertiary carbons. Its IUPAC name is:

• n-hexane
• 2-methylpentane
• 2,3-dimethylbutane
• 2,2-dimethylbutane

Q19: Fehling's solution 'A' is:

• aqueous copper sulphate
• alkaline copper sulphate
• alkaline solution of sodium potassium tartrate (Rochelle's salt)
• aqueous sodium citrate

Q20: Activation energy of any chemical reaction can be calculated if one knows the value of:

• rate constant at standard temperature
• probability of collision
• orientation of reactant molecules during collision
• rate constant at two different temperatures

Q21: The correct order of acidity of the following compounds is:

• 1
• 2
• 3
• 4

Q22: Match List I with List II: Choose the correct answer from the options given below:

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

Q23: The compound that will undergo SN1 reaction with the fastest rate is:

• 1
• 2
• 3
• 4

Q24: Which reaction is NOT a redox reaction?

• Zn + CuSO₄ → ZnSO₄ + Cu
• 2KClO₃ + I₂ → 2KIO₃ + Cl₂
• H₂ + Cl₂ → 2HCl
• BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl

Q25: 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:

• Both statement I and Statement II are correct
• Both Statement I and Statement II are incorrect
• Statement I is correct but Statement II is incorrect
• Statement I is incorrect but Statement II is correct

Q26: 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:

• Both statement I and Statement II are true
• Both Statement I and Statement II are false
• Statement I is true but Statement II is false
• Statement I is false but Statement II is true

Q27: 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:

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

Q28: 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:

• B > A > C
• B > C > A
• A > C > B
• A > B > C

Q29: 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:

• -x
• -x/9
• -4x
• -4x/9

Q30: The E° value for the Mn³⁺/Mn²⁺ couple is more positive than that of Cr³⁺/Cr²⁺ or Fe³⁺/Fe²⁺ due to change of:

• d⁵ to d⁴ configuration
• d⁵ to d² configuration
• d⁴ to d⁵ configuration
• d³ to d⁵ configuration

Q31: 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:

• B and C
• A and D
• B and E
• E and D

Q32: 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:

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

Q33: 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:

• Li < Be < B < C < N
• Li < B < Be < C < N
• Li < Be < C < B < N
• Li < Be < N < B < C

Q34: 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:

• 750 mg
• 250 mg
• Zero mg
• 200 mg

Q35: 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?

• Reaction is at equilibrium
• Reaction has a tendency to go in forward direction
• Reaction has a tendency to go in backward direction
• Reaction has gone to completion in forward direction

Q36: 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:

• B, A, D, C, E
• B, C, A, D, E
• E, C, D, B, A
• E, A, B, C, D

Q37: The products A and B obtained in the following reactions, respectively, are: 3ROH + PCl₃ → 3RCl + A ROH + PCl₅ → RCl + HCl + B

• POCl₃ and H₃PO₃
• POCl₃ and H₃PO₄
• H₃PO₄ and POCl₃
• H₃PO₃ and POCl₃

Q38: 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)

• 3.15 g
• 0.315 g
• 31.5 g
• 0.0315 g

Q39: 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)

• 37°C
• 310°C
• 25.73°C
• 12.05°C

Q40: Identify the major product C formed in the following reaction sequence:

• propylamine
• butylamine
• butanamide
• α-bromobutanoic acid

Q41: Identify the correct answer:

• Three resonance structures can be drawn for ozone
• BF₃ has non-zero dipole moment
• Dipole moment of NF₃ is greater than that of NH₃
• Three canonical forms can be drawn for CO₃²⁻ ion

Q42: 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:

• Both Statement I and Statement II are true
• Both Statement I and Statement II are false
• Statement I is true but Statement II is false
• Statement I is false but Statement II is true

Q43: For the given reaction: 'P' is:

• 1
• 2
• 3
• 4

Q44: The pair of lanthanoid ions which are diamagnetic is:

• Ce⁴⁺ and Yb²⁺
• Ce³⁺ and Eu²⁺
• Gd³⁺ and Eu³⁺
• Pm³⁺ and Sm³⁺

Q45: 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?

• 0.00889
• 0.0889
• 0.8889
• 0.717

Q46: 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

• A₂BC₂
• ABC₃
• AB₂C₂
• ABC₄

Q47: 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

• 0 calorie
• -413.14 calories
• 413.14 calories
• 100 calories

Q48: The acid used for the preparation of hydrogen sulphide is:

• dilute hydrochloric acid
• concentrated sulphuric acid
• dilute nitric acid
• dilute sulphuric acid

Q49: 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

• 38.04 kJ/mol
• 380.4 kJ/mol
• 3.80 kJ/mol
• 3804 kJ/mol

Q50: Major products A and B formed in the following reaction sequence, are:

• 1
• 2
• 3
• 4