JEE Main 2025 Apr 3 Shift 2 — Chemistry

Mass of magnesium required to produce 220 mL of hydrogen gas at STP on reaction with excess of dil. HCl is

Given: Molar mass of Mg is $24\ \mathrm{g\ mol^{-1}}$.

For electrons in '2s' and '2p' orbitals, the orbital angular momentum values, respectively are :

Given below are two statements:

Statement I : When a system containing ice in equilibrium with water (liquid) is heated, heat is absorbed by the system and there is no change in the temperature of the system until whole ice gets melted.

Statement II : At melting point of ice, there is absorption of heat in order to overcome intermolecular forces of attraction within the molecules of water in ice and kinetic energy of molecules is not increased at melting point.

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

10 mL of 2 M NaOH solution is added to 20 mL of 1 M HCl solution kept in a beaker. Now, 10 mL of this mixture is poured into a volumetric flask of 100 mL containing 2 moles of HCl and made the volume upto the mark with distilled water. The solution in this flask is :

40 mL of a mixture of $\mathrm{CH_3COOH}$ and HCl (aqueous solution) is titrated against 0.1 M NaOH solution conductometrically. Which of the following statement is correct?

conductometric titration curve — Conductance (mS) vs $V_{\mathrm{NaOH}}$/mL; conductance falls from A to a minimum at B (2.0 mL), rises gently from B to C (5.0 mL), then rises steeply from C to D

The standard cell potential $\left(\mathrm{E^{\ominus}_{cell}}\right)$ of a fuel cell based on the oxidation of methanol in air that has been used to power television relay station is measured as 1.21 V. The standard half cell reduction potential for $\mathrm{O_2}$ $\left(\mathrm{E^{\circ}_{O_2/H_2O}}\right)$ is 1.229 V.

Choose the correct statement:

Consider the following statements related to temperature dependence of rate constants.

Identify the correct statements.

A. The Arrhenius equation holds true only for an elementary homogenous reaction. B. The unit of A is same as that of k in Arrhenius equation. C. At a given temperature, a low activation energy means a fast reaction. D. A and Ea as used in Arrhenius equation depend on temperature. E. When Ea >> RT, A and Ea become interdependent.

Choose the correct answer from the options given below:

Given below are two statements:

Statement I : Wet cotton clothes made of cellulose based carbohydrate takes comparatively longer time to get dried than wet nylon polymer based clothes.

Statement II : Intermolecular hydrogen bonding with water molecule is more in nylon-based clothes than in the case of cotton clothes.

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

Match the LIST-I with LIST-II

LIST-I (Family)	LIST-II (Symbol of Element)
A. Pnictogen (group 15)	I. Ts
B. Chalcogen	II. Og
C. Halogen	III. Lv
D. Noble gas	IV. Mc

Choose the correct answer from the options given below:

The correct orders among the following are

A. Atomic radius : $\mathrm{B < Al < Ga < In < Tl}$ B. Electronegativity : $\mathrm{Al < Ga < In < Tl < B}$ C. Density : $\mathrm{Tl < In < Ga < Al < B}$ D. 1st Ionisation Energy : $\mathrm{In < Al < Ga < Tl < B}$

Choose the correct answer from the options given below:

Given below are two statements:

Statement I : $\mathrm{CrO_3}$ is a stronger oxidizing agent than $\mathrm{MoO_3}$

Statement II : Cr(VI) is more stable than Mo(VI)

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

Identify the diamagnetic octahedral complex ions from below ;

A. $\mathrm{[Mn(CN)_6]^{3-}}$ B. $\mathrm{[Co(NH_3)_6]^{3+}}$ C. $\mathrm{[Fe(CN)_6]^{4-}}$ D. $\mathrm{[Co(H_2O)_3F_3]}$

Choose the correct answer from the options given below:

Compounds that should not be used as primary standards in titrimetric analysis are :

A. $\mathrm{Na_2Cr_2O_7}$ B. Oxalic acid C. NaOH D. $\mathrm{FeSO_4 \cdot 6H_2O}$ E. Sodium tetraborate

Choose the most appropriate answer from the options given below:

In Dumas' method for estimation of nitrogen 0.4 g of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm Hg pressure. The percentage composition of nitrogen in the compound is

(Given : Aqueous tension at 300 K = 15 mm Hg)

Given below are two statements:

Statement I : Hyperconjugation is not a permanent effect.

Statement II : In general, greater the number of alkyl groups attached to a positively charged C-atom, greater is the hyperconjugation interaction and stabilization of the cation.

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

What is the correct IUPAC name of

benzene ring bearing $\mathrm{CO_2H}$, with $\mathrm{OH}$ on the carbon adjacent to $\mathrm{CO_2H}$, $\mathrm{Br}$ on the carbon adjacent to the $\mathrm{OH}$, and $\mathrm{NO_2}$ meta to $\mathrm{CO_2H}$ (positions: 1-$\mathrm{CO_2H}$, 2-$\mathrm{OH}$, 3-$\mathrm{Br}$, 5-$\mathrm{NO_2}$)

?

In the following series of reactions identify the major products A & B respectively

$$\text{Bromobenzene} \xrightarrow[\mathrm{H_2SO_4}]{\mathrm{SO_3}} \underset{\text{Major product}}{\mathrm{A}} \xrightarrow{\mathrm{Br_2,\ Fe}} \underset{\text{Major product}}{\mathrm{B}}$$

bromobenzene structure shown; the options are drawn structures

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

$$\mathrm{Ph{-}\overset{\displaystyle O}{\overset{\|}{C}}{-}\overset{\displaystyle O}{\overset{\|}{C}}{-}H} \xrightarrow[\Delta]{\mathrm{KOH}} \underset{\text{Major Product}}{\mathrm{P}}$$

The sequence from the following that would result in giving predominantly 3, 4, 5-Tribromoaniline is :

Fat soluble vitamins are:

A. Vitamin $\mathrm{B_1}$ B. Vitamin C C. Vitamin E D. Vitamin $\mathrm{B_{12}}$ E. Vitamin K

Choose the correct answer from the options given below:

P–V diagram; P/atm on the y-axis (1.00 and 3.00 marked), V/cm$^3$ on the x-axis (1000 and 2000 marked); path: point 1 (1.00 atm, 1000 cm$^3$) up to point 2 (3.00 atm, 1000 cm$^3$), right to point 3 (3.00 atm, 2000 cm$^3$), down to point 4 (1.00 atm, 2000 cm$^3$)

A perfect gas (0.1 mol) having $\overline{C}_v = 1.50\mathrm{R}$ (independent of temperature) undergoes the above transformation from point 1 to point 4. If each step is reversible, the total work done (w) while going from point 1 to point 4 is (–) __________ J (nearest integer)

[Given : $\mathrm{R} = 0.082\ \mathrm{L\ atm\ K^{-1}\ mol^{-1}}$]

A sample of n-octane (1.14 g) was completely burnt in excess of oxygen in a bomb calorimeter, whose heat capacity is $5\ \mathrm{kJ\ K^{-1}}$. As a result of combustion reaction, the temperature of the calorimeter is increased by 5 K. The magnitude of the heat of combustion of octane at constant volume is __________ $\mathrm{kJ\ mol^{-1}}$ (nearest integer).

Among, Sc, Mn, Co and Cu, identify the element with highest enthalpy of atomisation. The spin only magnetic moment value of that element in its +2 oxidation state is __________ BM (in nearest integer).

X g of nitrobenzene on nitration gave 4.2 g of m-dinitrobenzene. X = __________ g. (nearest integer)

[Given : molar mass (in $\mathrm{g\ mol^{-1}}$) C : 12, H : 1, O : 16, N : 14]

The total number of structural isomers possible for the substituted benzene derivatives with the molecular formula $\mathrm{C_9H_{12}}$ is __________.