NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry

NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 51

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Choose the correct answer from the options given below :

A

(A) - (IV), (B) − (II), (C) − (I), (D) − (III)

B

(A) − (III), (B) − (I), (C) − (II), (D) − (IV)

C

(A) - (IV), (B) − (I), (C) − (II), (D) − (III)

D

(A) − (III), (B) − (II), (C) − (I), (D) − (IV)

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 52

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500J of energy is transferred as heat to 0.5 mol of Argon gas at 298 K and 1.00 atm. The final temperature and the change in internal energy respectively are: Given : $$R = 8.3 J K^{-1}mol^{-1}$$

A

378 K and 500 J

B

368 K and 500 J

C

348 K and 300 J

D

378 K and 300 J

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 53

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At temperature $$T$$, compound $$AB_{2(g)}$$ dissociates as $$AB_{2} \rightleftharpoons AB_{(g)}+\frac{1}{2}B_{2(g)}$$ having degree of dissociation $$x$$ (small compared to unity). The correct expression for $$x$$ in terms of $$K_{p}$$ and p is

A

$$sqrt[4]{\frac{2K_{p}}{p}}$$

B

$$sqrt[3]{\frac{2K_{p}}{p}}$$

C

$$sqrt[3]{\frac{2K_{p}^{2}}{p}}$$

D

$$sqrt{K_{p}}$$

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 54

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An element 'E'has the ionisation enthalpy value of $$374 kJ mol^{-1}$$.'E'reacts with elements A, B, C and D with electron gain enthalpy values of −328, −349, −325 and $$-295 kJ mol^{-1}$$, respectively. The correct order of the products EA, EB, EC and ED in terms of ionic character is :

A

ED > EC > EB > EA

B

EA > EB > EC > ED

C

EB > EA > EC > ED

D

ED > EC > EA > EB

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 55

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Total number of nucleophiles from the following is :
$$NH_{3},PhSH,(H_{3}C)_{2}S,H_{2}C=CH_{2},\ominus\\O H,H_{3}O^{\oplus},(CH_{3})_{2}CO,\rightleftharpoons NCH_{3}$$

A

7

B

4

C

6

D

5

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 56

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The steam volatile compounds among the following are :
 (A)

(B) 

(C)

(D) 

Choose the correct answer from the options given below :

A

(B) and (D) Only

B

(A) and (C) Only

C

(A), (B) and (C) Only

D

(A) and (B) Only

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 57

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Given below are two statements : Statement (I): The radii of isoelectronic species increases in the order. $$Mg^{2+} < Na^{+} < F^{-} < O^{2-}$$ Statement (II): The magnitude of electron gain enthalpy of halogen decreases in the order. Cl > F > Br > I 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

Statement I is correct but Statement II is incorrect

C

Both Statement I and Statement II are incorrect

D

Both Statement I and Statement II are correct

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 58

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Match List - I with List - II.

choose the correct answer from the options given below :

A

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

B

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

C

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

D

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

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 59

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The molar conductivity of a weak electrolyte when plotted against the square root of its concentration, which of the following is expected to be observed ?

A

A small decrease in molar conductivity is observed at infinite dilution.

B

Molar conductivity decreases sharply with increase in concentration.

C

A small increase in molar conductivity is observed at infinite dilution.

D

Molar conductivity increases sharply with increase in concentration.

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 60

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The standard reduction potential values of some of the p-block ions are given below. Predict the one with the strongest oxidising capacity.

A

$$E_{Pb^{4+}/Pb^{2+}}^{\ominus}=+1.67 V$$

B

$$E_{Sn^{4+}/Sn^{2+}}^{\ominus}=+1.15 V$$

C

$$E_{Al^{3+}/Al}^{\ominus}=-1.66 V$$

D

$$E_{Tl}^{\ominus}/Tl/2.26 V$$

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 61

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The product (P) formed in the following reaction is :

A

B

C

D

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 62

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If $$a_{\circ}$$ is denoted as the Bohr radius of hydrogen atom, then what is the de-Broglie wavelength $$(\lambda)$$ of the electron present in the second orbit of hydrogen atom? [n : any integer]

A

$$\frac{8\pi a_{\circ}}{n}$$

B

$$\frac{2a_{\circ}}{n\pi}$$

C

$$\frac{4}{\pi a_{\circ}}$$

D

$$\frac{4\pi a_{\circ}}{n}$$

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 63

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Match 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)-(II), (B)-(III), (C)-(I), (D)-(IV)

C

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

D

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

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 64

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The reaction $$A_{2}+B_{2}\rightarrow 2AB$$ follows the mechanism
$$A_{2}k_{1}A+A(fast)\\ \text{     }{_{k_{-1}}}\\ \\A+B_{2}\xrightarrow{k_{2}}AB+B(slow)\\A+B \rightarrow AB(fast)$$
The overall order of the reaction is :

A

2

B

2.5

C

3

D

1.5

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 65

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1.24 g of $$AX_{2}$$ (molar mass 124 g $$mol^{-1}$$) is dissolved in 1 kg of water to form a solution with boiling point of $$100.0156^{\circ}C$$, while $$25.4g^{\circ}$$ of $$AY_{2}$$ (molar mass 250 g $$mol^{-1}$$) in 2 kg of water constitutes a solution with a boiling point of $$100.0260^{\circ}C.K_{b}(H_{2}O)=0.52 K$$ kg $$mol^{-1}$$ Which of the following is correct ?

A

$$AX_{2}$$ is fully ionised while $$AY_{2}$$ is completely unionised.

B

$$AX_{2}$$ is completely unionised while $$AY_{2}$$ is fully ionised.

C

$$AX_{2}$$ and $$AY_{2}$$ (both) are completely unionised.

D

$$AX_{2}$$ and $$AY_{2}$$ (both) are fully ionised.

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 66

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Choose the correct statements. (A) Weight of a substance is the amount of matter present in it. (B) Mass is the force exerted by gravity on an object. (C) Volume is the amount of space occupied by a substance. (D) Temperatures below $$O^{\circ}C$$ are possible in Celsius scale, but in Kelvin scale negative temperature is not possible. (E) Precision refers to the closeness of various measurements for the same quantity. Choose the correct answer from the options given below :

A

(A), (D) and (E) Only

B

(C), (D) and (E) Only

C

(A), (B) and (C) Only

D

(B), (C) and (D) Only

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 67

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The correct option with order of melting points of the pairs (Mn, Fe), (Tc, Ru) and (Re, Os) is :

A

Fe < Mn, Ru < Tc and Re < Os

B

Mn < Fe, Tc < Ru and Os < Re

C

Mn < Fe, Tc < Ru and Re < Os

D

Fe < Mn, Ru < Tc and Os < Re

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 68

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For a $$Mg|Mg^{2+}(aq)||Ag^{+}(aq)|Ag$$ the correct Nernst Equation is :

A

$$E_{cell}=E_{cell}^{\circ}-\frac{RT}{2F}ln\frac{[Ag^{+}]}{[Mg^{2+}]}$$

B

$$E_{cell}=E_{cell}^{\circ}+\frac{RT}{2F}ln\frac{[Ag^{+}]^{2}}{[Mg^{2+}]}$$

C

$$E_{cell}=E_{cell}^{\circ}-\frac{RT}{2F}ln\frac{[Ag^{+}]^{2}}{[Mg^{2+}]}$$

D

$$E_{cell}=E_{cell}^{\circ}-\frac{RT}{2F}ln\frac{[Mg^{2+}]}{[Ag^{+}]}$$

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 69

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In The following substitution reaction :

product 'P'formed is :

A

B

C

D

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 70

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The correct increasing order of stability of the complexes based on $$\Delta_{\circ}$$ value is: I.$$[Mn(CN)_{6}]^{3}$$ II.$$[Co(CN)_{6}]^{4-}$$ III.$$[Fe(CN)_{6}]^{4-}$$ IV.$$[Fe(CN)_{6}]^{3-}$$

A

IV < III < II < I

B

I < II < IV < III

C

III < II < IV < I

D

II < III < I < IV

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 71

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The molar mass of the water insoluble product formed from the fusion of chromite ore $$(FeCr_{2}O_{4})$$ with $$Na_{2}CO_{3}$$ in presence of $$O_{2}$$ is_______$$gmol^{-1}$$.

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 72

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Given below are some nitrogen containing compounds

Each of them is treated with HCl separately. 1.0 g of the most basic compound will consume _______ mg of HCl. (Given molar mass in $$gmol^{-1}$$ C : 12, H : 1, O : 16, Cl : 35.5)

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 73

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The sum of sigma $$(\sigma)$$ and pi$$(\pi)$$ bonds in Hex-1,3-dien-5-yne is _______.

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 74

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0.1 mole of compound ' S ' will weigh _______ g. (Given molar mass in $$gmol^{-1}$$ C : 12, H : 1, O : 16)

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NTA JEE Mains 29th Jan 2025 Shift 1 - Chemistry - Question 75

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If $$A_{2}B$$ is 30% ionised in an aqueous solution, then the value of van't Hoff factor (i) is ______ $$\times 10^{-1}$$

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