NEET 2025 Chemistry Question Paper (Available): Download NEET 2025 Answer key Code 46

Given below are two statements:

Statement I: Ferromagnetism is considered as an extreme form of paramagnetism.
Statement II: The number of unpaired electrons in a Cr²⁺ ion (Z = 24) is the same as that of a Nd³⁺ ion (Z = 60).

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

• (1) Both Statement I and Statement II are false
• (2) Statement I is true but Statement II is false
• (3) Statement I is false but Statement II is true
• (4) Both Statement I and Statement II are true

For the reaction A(g) \(\rightleftharpoons\) 2B(g), the backward reaction rate constant is higher than the forward reaction rate constant by a factor of 2500, at 1000 K.

[Given: R = 0.0831 atm {–1} K{–1}]


K_p for the reaction at 1000 K is:

• (1) \(2.077 \times 10^5\)
• (2) 0.033
• (3) 0.021
• (4) 83.1

Total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula C₄H₈O is:

• (1) 8
• (2) 10
• (3) 11
• (4) 6

Given below are two statements:

Statement I: A hypothetical diatomic molecule with bond order zero is quite stable.
Statement II: As bond order increases, the bond length increases.

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

• (1) Both Statement I and Statement II are false
• (2) Statement I is true but Statement II is false
• (3) Statement I is false but Statement II is true
• (4) Both Statement I and Statement II are true

Identify the suitable reagent for the following conversion:

The major product of the following reaction is:
 

(i) CH₃MgBr (excess)
(ii) H⁺/H₂O

• (1) Ph-CH(CH₃)-CH₂-COCH₃
• (2) Ph-C(CH₃)(OH)-CH(CH₃)₂
• (3) Ph-CO-CH₂CH₂CH₃
• (4) Ph-CH(CH₃)-CH₂-CN

If the molar conductivity (\(\Lambda_m\)) of a 0.050 mol L^–1 solution of a monobasic weak acid is 90 S cm² mol^–1, its extent (degree) of dissociation will be:

[Assume: \(\Lambda^0 = 349.6\) S cm² mol^–1 and \(\Lambda^0_{acid} = 50.4\) S cm² mol^–1]

• (1) 0.125
• (2) 0.225
• (3) 0.215
• (4) 0.115

Which one of the following reactions does NOT belong to “Lassaigne's test”?

The correct order of decreasing acidity of the following aliphatic acids is:

Match List I with List II:



Choose the correct answer from the options given below:

• (1) A-IV, B-III, C-I, D-II
• (2) A-II, B-III, C-I, D-IV
• (3) A-IV, B-III, C-II, D-I
• (4) A-I, B-III, C-II, D-IV

Out of the following complex compounds, which of the compound will be having the minimum conductance in solution?

• (1) [Co(NH₃)₄Cl₂]Cl
• (2) [Co(NH₃)₆]Cl₃
• (3) [Co(NH₃)₅Cl]Cl
• (4) [Co(NH₃)₃Cl₃]

Sugar ‘X’:

A. is found in honey.
B. is a keto sugar.
C. exists in \(\alpha\) and \(\beta\) anomeric forms.
D. is laevorotatory.

‘X’ is:

• (1) D-Fructose
• (2) Sucrose
• (3) Maltose
• (4) D-Glucose

How many products (including stereoisomers) are expected from monochlorination of the following compound?
CH₃-CH-CH₂-CH₃

• (1) 3
• (2) 6
• (3) 5
• (4) 2

Which one of the following compounds can exist as cis-trans isomers?

• (1) 2-Methylhex-2-ene
• (2) 1,1-Dimethylcyclopropane
• (3) 1,2-Dimethylcyclohexane
• (4) Pent-1-ene

Which one of the following reactions does NOT give benzene as the product?

Phosphoric acid ionizes in three steps with their ionization constant values \( K_1 \), \( K_2 \), and \( K_3 \), respectively, while \( K \) is the overall ionization constant.

Which of the following statements are true?

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

Among the following, choose the ones with an equal number of atoms.

A. 212 g of Na₂CO₃ (s) [molar mass = 106 g]
B. 248 g of NaNO₃ (s) [molar mass = 62 g]
C. 240 g of NaOH (s) [molar mass = 40 g]
D. 12 g of H₂ (g) [molar mass = 2 g]
E. 220 g of CO₂ (g) [molar mass = 44 g]

Choose the correct answer from the options given below:

• (1) A, B, and D only
• (2) B, C, and D only
• (3) B, D, and E only
• (4) A, B, and C only

Given below are two statements:

Statement I: Like nitrogen that can form ammonia, arsenic can form arsine.
Statement II: Antimony cannot form antimony pentoxide.

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

• (1) Both Statement I and Statement II are incorrect
• (2) Statement I is correct but Statement II is incorrect
• (3) Statement I is incorrect but Statement II is correct
• (4) Both Statement I and Statement II are correct

Dalton’s Atomic Theory could not explain which of the following?

• (1) Law of constant proportion
• (2) Law of multiple proportion
• (3) Law of gaseous volume
• (4) Law of conservation of mass

The correct order of decreasing basic strength of the given amines is:

• (1) N-ethylmethanamine > ethanamine > benzenamine > N-methylaniline
• (2) N-ethylmethanamine > ethanamine > N-methylaniline > benzenamine
• (3) N-methylaniline > ethanamine > benzenamine > N-ethylmethanamine
• (4) N-methylaniline > N-ethylmethanamine > benzenamine > ethanamine

Which of the following statements are true?

A. Unlike Ga that has a very high melting point, Cs has a very low melting point.
B. On Pauling scale, the electronegativity values of N and C are not the same.
C. Ar, K⁺, Cl^–, Ca²⁺ and S^2– are all isoelectronic species.
D. The correct order of the first ionization enthalpies of Na, Mg, Al, and Si is Si > Al > Mg > Na.
E. The atomic radius of Cs is greater than that of Li and Rb.

Choose the correct answer from the options given below:

• (1) C and E only
• (2) C and D only
• (3) A, C, and E only
• (4) A, B, and E only

Match List I with List II:


Choose the correct answer from the options given below:

• (1) A-I, B-IV, C-III, D-II
• (2) A-IV, B-II, C-III, D-I
• (3) A-IV, B-I, C-II, D-III
• (4) A-II, B-I, C-IV, D-III

The standard heat of formation, in kcal/mol, of Ba²⁺ is:

Given: Standard heat of formation of SO₄^2–(aq) = -216 kcal/mol, standard heat of crystallization of BaSO₄(s) = -4.5 kcal/mol, standard heat of formation of BaSO₄(s) = -349 kcal/mol.

• (1) 133.0
• (2) 133.0 + 133.0
• (3) 220.5
• (4) -128.5

Among the given compounds I-III, the correct order of bond dissociation energy of the C-H bond marked with is:

• (1) I > II > III
• (2) III > II > I
• (3) II > I > III
• (4) I > III > II

Predict the major product \( P \) in the following sequence of reactions:

(i) HBr, benzoyl peroxide
(ii) KCN
(iii) Na(Hg), C₂H₅OH

• (1) C₆H₅-CH₂-CH₃
• (2) C₆H₅-CH₂-NH₂
• (3) C₆H₅-CH₂-CN
• (4) C₆H₅-NH₂

Match List I with List II:



Choose the correct answer from the options given below:

• (1) A-I, B-IV, C-III, D-II
• (2) A-I, B-II, C-III, D-IV
• (3) A-I, B-IV, C-III, D-II
• (4) A-I, B-II, C-IV, D-III

Energy and radius of first Bohr orbit of He⁺ and Li²⁺ are:
Given: \( R_H = 2.18 \times 10^{-18} \, J, a_0 = 52.9 \, pm \)

• (1) \( E_n (\text{Li}^{2+}) = -8.72 \times 10^{-18} \, \text{J}, r_n (\text{Li}^{2+}) = 26.4 \, \text{pm}, E_n (\text{He}^{+}) = -19.62 \times 10^{-18} \, \text{J}, r_n (\text{He}^{+}) = 9.6 \, \text{pm} \)
• (2) \( E_n (\text{Li}^{2+}) = -19.62 \times 10^{-16} \, \text{J}, r_n (\text{Li}^{2+}) = 17.6 \, \text{pm}, E_n (\text{He}^{+}) = -8.72 \times 10^{-16} \, \text{J}, r_n (\text{He}^{+}) = 26.4 \, \text{pm} \)
• (3) \( E_n (\text{Li}^{2+}) = -8.72 \times 10^{-16} \, \text{J}, r_n (\text{Li}^{2+}) = 17.6 \, \text{pm}, E_n (\text{He}^{+}) = -19.62 \times 10^{-16} \, \text{J}, r_n (\text{He}^{+}) = 26.4 \, \text{pm} \)
• (4) \( E_n (\text{Li}^{2+}) = -19.62 \times 10^{-18} \, \text{J}, r_n (\text{Li}^{2+}) = 17.5 \, \text{pm}, E_n (\text{He}^{+}) = -8.72 \times 10^{-18} \, \text{J}, r_n (\text{He}^{+}) = 26.4 \, \text{pm} \)

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

Assertion (A): I^– undergoes SN₂ reaction faster than Cl^–.
Reason (R): Iodine is a better leaving group because of its large size.

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

• (1) Both A and R are true but R is not the correct explanation of A.
• (2) A is true but R is false.
• (3) A is false but R is true.
• (4) Both A and R are true and R is the correct explanation of A.

If the half-life (\( t_{1/2} \)) for a first-order reaction is 1 minute, then the time required for 99.9% completion of the reaction is closest to:

• (1) 4 minutes
• (2) 5 minutes
• (3) 10 minutes
• (4) 2 minutes

Which of the following aqueous solutions will exhibit the highest boiling point?

• (1) 0.01M KNO₃
• (2) 0.01M H₂SO₄
• (3) 0.01M C₆H₁₂O₆
• (4) 0.01M Urea

Higher yield of NO in the reaction

N₂ (g) + O₂ (g) → 2NO (g)

can be obtained at [\( \Delta H \) of the reaction = +180.7 kJ mol\(^{-1}\)]

• (1) B, C only
• (2) B, C, D only
• (3) A, C, D only
• (4) A, D only

Match List I with List II:



Choose the correct answer from the options given below:

• (1) A-III, B-IV, C-II, D-I
• (2) A-III, B-II, C-IV, D-I
• (3) A-III, B-IV, C-I, D-II
• (4) A-III, B-IV, C-II, D-I

The ratio of the wavelengths of the light absorbed by a Hydrogen atom when it undergoes n = 2 → n = 3 and n = 4 → n = 6 transitions, respectively, is:

• (1) 1 : 9
• (2) 1 : 36
• (3) 1 : 4
• (4) 1 : 25

The correct order of the wavelength of light absorbed by the following complexes is:

A. [ Co(NH₃)₆]³⁺
B. [ Co(CN)₆]^3–
C. [ Cu(H₂O)₄]²⁺
D. [ Ti(H₂O)₆]³⁺

Choose the correct answer from the options given below:

• (1) B < A < C < D
• (2) C < D < A < B
• (3) C < A < D < B
• (4) B < D < A < C

Match List I with List II:



Choose the correct answer from the options given below:

• (1) A-IV, B-III, C-II, D-I
• (2) A-III, B-IV, C-I, D-II
• (3) A-III, B-IV, C-II, D-I
• (4) A-IV, B-II, C-I, D-II

If the rate constant of a reaction is 0.03 s\(^{-1}\), how much time does it take for a 7.2 mol L\(^{-1}\) concentration of the reactant to get reduced to 0.9 mol L\(^{-1}\)?

(Given: log 2 = 0.301)

• (1) 23.1 s
• (2) 210 s
• (3) 21.0 s
• (4) 69.3 s

Which among the following electronic configurations belong to main group elements?

A. [Ne]3s¹
B. [Ar]3d³4s²
C. [Kr]4d⁵3s²5p⁵
D. [Ar]3d¹⁰4s¹
E. [Rn]5f⁷6d²7s²

Choose the correct answer from the options given below:

• (1) A and C only
• (2) D and E only
• (3) A, C, and D only
• (4) B and E only

Match List I with List II:



Choose the correct answer from the options given below:

• (1) A-II, B-I, C-IV, D-III
• (2) A-III, B-I, C-IV, D-II
• (3) A-III, B-II, C-I, D-IV
• (4) A-II, B-IV, C-I, D-III

5 moles of liquid X and 10 moles of liquid Y make a solution having a vapor pressure of 70 torr. The vapor pressures of pure X and Y are 63 torr and 78 torr, respectively. Which of the following is true regarding the described solution?

• (1) The solution shows negative deviation.
• (2) The solution is ideal.
• (3) The solution has volume greater than the sum of individual volumes.
• (4) The solution shows positive deviation.

C(s) + 2H\(_2\)(g) \(\rightarrow\) CH\(_4\)(g); \(\Delta H = -74.8 \, kJ mol^{-1}\)

Which of the following diagrams gives an accurate representation of the above reaction?

• (1)
  
• (2)
  
• (3)
  
• (4)
  

Correct Answer: (3)
View Solution

Which one of the following compounds does not decolorize bromine water?

• (1) Phenol
• (2) CH\(_2\)CH\(_2\)
• (3) NH\(_2\)
• (4) Cyclohexane

Consider the following compounds:

\text{K\(_2\)O\(_2\), H\(_2\)O\(_2\), and H\(_2\)SO\(_4\)

The oxidation states of the underlined elements in them are, respectively:

• (1) +2, -2, and +6
• (2) +1, -2, and +4
• (3) +4, -4, and +6
• (4) +1, -1, and +6

Given below are two statements:


Statement I: Benzendiazonium salt is prepared by the reaction of aniline with nitrous acid at 273-278 K. It decomposes easily in the dry state.

Statement II: Insertion of iodine into the benzene ring is difficult and hence iodobenzene is prepared through the reaction of benzendiazonium salt with KI.


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

• (1) Both Statement I and Statement II are incorrect.
• (2) Statement I is correct but Statement II is incorrect.
• (3) Statement I is incorrect but Statement II is correct.
• (4) Both Statement I and Statement II are correct.

Which of the following are paramagnetic?


A. [NiCl\(_4\)]\(^{2-}\)

B. Ni(CO)\(_4\)

C. [Ni(CN)\(_4\)]\(^{2-}\)

D. [Ni(H\(_2\)O)\(_6\)]\(^{2+}\)

E. Ni(PPh\(_3\))\(_4\)


Choose the correct answer from the options given below:

• (1) B and E only
• (2) A and D only
• (3) A, D, and E only
• (4) A and C only