NTA JEE Main 2025 April 3rd Shift 1 - Chemistry

NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 51

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Which of the following postulate of Bohr's model of hydrogen atom is not in agreement with quantum mechanical model of an atom ?

A

An atom in a stationary state does not emit electromagnetic radiation as long as it stays in the same state

B

An atom can take only certain distinct energies $$E_1, E_2, E_3$$, etc. These allowed states of constant energy are called the stationary states of atom

C

When an electron makes a transition from a higher energy stationary state to a lower energy stationary state, then it emits a photon of light

D

The electron in a H atom's stationary state moves in a circle around the nucleus

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 52

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Given below are two statements :
Statement I : The N-N single bond is weaker and longer than that of P-P single bond
Statement II : Compounds of group 15 elements in +3 oxidation states readily undergo disproportionation reactions.
In the light of the above statements, choose the correct answer from the options given below

A

Statement I is true but Statement II is false

B

Both Statement I and Statement II are false

C

Statement I is false but Statement II is true

D

Both Statement I and Statement II are true

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 53

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Given below are two statements
Statement I : A catalyst cannot alter the equilibrium constant $$(K_c)$$ of the reaction, temperature remaining constant
Statement II : A homogeneous catalyst can change the equilibrium composition of a system temperature remaining constant
In the light of the above statements, choose the correct answer from the options given below

A

Statement I is false but Statement II is true

B

Both Statement I and Statement II are true

C

Both Statement I and Statement II are false

D

Statement I is true but Statement II is false

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 54

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The metal ions that have the calculated spin only magnetic moment value of 4.9 B.M. are
A. $$Cr^{2+}$$
B. $$Fe^{2+}$$
C. $$Fe^{3+}$$
D. $$Co^{2+}$$
E. $$Mn^{3+}$$

Choose the correct answer from the options given below

A

A, C and E only

B

A, D and E only

C

B and E only

D

A, B and E only

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 55

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In a reaction $$A + B \to C$$, initial concentrations of A and B are related as $$[A]_0 = 8[B]_0$$. The half lives of A and B are 10 min and 40 min respectively. If they start to disappear at the same time, both following first order kinetics, after how much time will the concentration of both the reactants be same?

A

$$60$$ min

B

$$80$$ min

C

$$20$$ min

D

$$40$$ min

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 56

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Which of the following is the correct structure of L-fructose ?

A

B

C

D

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 57

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Identify the correct statements from the following

Choose the correct answer from the options given below

A

C & D only

B

B & C only

C

A & B only

D

A, B & C only

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 58

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Among $$10^{-9}$$ g (each) of the following elements, which one will have the highest number of atoms?
Element : Pb, Po, Pr and Pt

A

Po

B

Pr

C

Pb

D

Pt

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 59

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Which of the following statements are correct?
A. The process of the addition of an electron to a neutral gaseous atom is always exothermic
B. The process of removing an electron from an isolated gaseous atom is always endothermic
C. The 1st ionization energy of the boron is less than that of the beryllium
D. The electronegativity of C is 2.5 in $$CH_4$$ and $$CCl_4$$
E. Li is the most electropositive among elements of group I

Choose the correct answer from the options given below

A

B and C only

B

A, C and D only

C

B and D only

D

B, C and E only

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 60

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Which of the following properties will change when system containing solution 1 will become solution 2 ?

A

Molar heat capacity

B

Density

C

Concentration

D

Gibbs free energy

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 61

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Number of molecules from below which cannot give iodoform reaction is :
Ethanol, Isopropyl alcohol, Bromoacetone, 2-Butanol, 2-Butanone, Butanal, 2-Pentanone, 3-Pentanone, Pentanal and 3-Pentanol

A

$$5$$

B

$$4$$

C

$$3$$

D

$$2$$

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 62

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Identify [A], [B], and [C], respectively in the following reaction sequence :

A

B

C

D

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 63

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In the following reactions, which one is NOT correct?

A

B

C

D

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 64

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The correct order of the complexes $$[Co(NH_3)_4(H_2O)]^{3+}$$ (A), $$[Co(NH_3)_6]^{3+}$$ (B), $$[Co(CN)_6]^{3-}$$ (C) and $$[CoCl(NH_3)_5]^{2+}$$ (D) in terms of wavelength of light absorbed is :

A

$$D \gt A \gt B \gt C$$

B

$$C \gt B \gt D \gt A$$

C

$$D \gt C \gt B \gt A$$

D

$$C \gt B \gt A \gt D$$

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 65

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2 moles each of ethylene glycol and glucose are dissolved in 500 g of water. The boiling point of the resulting solution is :
(Given : Ebullioscopic constant of water = 0.52 K kg mol$$^{-1}$$)

A

$$379.2$$ K

B

$$377.3$$ K

C

$$375.3$$ K

D

$$277.3$$ K

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 66

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Which compound would give 3-methyl-6-oxoheptanal upon ozonolysis ?

A

B

C

D

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 67

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Match the LIST-I with LIST-II.

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

D

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

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 68

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The least acidic compound, among the following is:

A

D

B

A 

C

B 

D

C 

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 69

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Correct order of limiting molar conductivity for cations in water at 298 K is :

A

$$H^+ \gt Na^+ \gt K^+ \gt Ca^{2+} \gt Mg^{2+}$$

B

$$H^+ \gt Ca^{2+} \gt Mg^{2+} \gt K^+ \gt Na^+$$

C

$$Mg^{2+} \gt H^+ \gt Ca^{2+} \gt K^+ \gt Na^+$$

D

$$H^+ \gt Na^+ \gt Ca^{2+} \gt Mg^{2+} \gt K^+$$

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 70

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During estimation of nitrogen by Dumas' method of compound X (0.42 g) :

_________ mL of $$N_2$$ gas will be liberated at STP. (nearest integer)
(Given molar mass in g mol$$^{-1}$$ : C : 12, H : 1, N : 14)

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 71

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0.5 g of an organic compound on combustion gave 1.46 g of $$CO_2$$ and 0.9 g of $$H_2O$$. The percentage of carbon in the compound is _________. (Nearest integer)
[Given : Molar mass (in g mol$$^{-1}$$) C : 12, H : 1, O : 16]

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 72

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The number of optical isomers exhibited by the iron complex (A) obtained from the following reaction is _________.
$$FeCl_3 + KOH + H_2C_2O_4 \to A$$

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 73

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Given :
$$\Delta H^{\ominus}_{\text{sub}}[C(\text{graphite})] = 710$$ kJ mol$$^{-1}$$
$$\Delta_{C-H} H^{\ominus} = 414$$ kJ mol$$^{-1}$$
$$\Delta_{H-H} H^{\ominus} = 436$$ kJ mol$$^{-1}$$
$$\Delta_{C=C} H^{\ominus} = 611$$ kJ mol$$^{-1}$$

The $$\Delta H_f^{\ominus}$$ for $$CH_2=CH_2$$ is _________ kJ mol$$^{-1}$$
(nearest integer value)

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 74

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Consider the following reactions
$$A + NaCl + H_2SO_4 \to CrO_2Cl_2 + \text{Side Products}$$ (Little amount)
$$CrO_2Cl_{2(Vapour)} + NaOH \to B + NaCl + H_2O$$
$$B + H^+ \to C + H_2O$$

The number of terminal 'O' present in the compound 'C' is _________.

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NTA JEE Main 2025 April 3rd Shift 1 - Chemistry - Question 75

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In the following system,
$$PCl_5(g) \rightleftharpoons PCl_3(g) + Cl_2(g)$$ at equilibrium, upon addition of xenon gas at constant T & p, the concentration of

A

$$PCl_5$$ will increase

B

$$Cl_2$$ will decrease

C

$$PCl_5$$, $$PCl_3$$ & $$Cl_2$$ remain constant

D

$$PCl_3$$ will increase

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