JEE Main 2025 Jan 22 Shift 2 — Chemistry

Given below are two statements :

Statement (I) : A spectral line will be observed for a $2p_x \to 2p_y$ transition.

Statement (II) : $2p_x$ and $2p_y$ are degenerate orbitals.

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

Density of $3$ M NaCl solution is $1.25\ \mathrm{g/mL}$. The molality of the solution is :

The species which does not undergo disproportionation reaction is :

Consider the given figure and choose the correct option :

energy vs reaction coordinate diagram — the curve rises from Reactant to a peak labelled Activated complex, then falls to Product; $E_1$ marks the drop from the peak down to the product level and $E_2$ the gap between the product and reactant levels, the product level lying above the reactant level

Arrange the following compounds in increasing order of their dipole moment : $\mathrm{HBr}$, $\mathrm{H_2S}$, $\mathrm{NF_3}$ and $\mathrm{CHCl_3}$

Given below are two statements :

Statement (I) : An element in the extreme left of the periodic table forms acidic oxides.

Statement (II) : Acid is formed during the reaction between water and oxide of a reactive element present in the extreme right of the periodic table.

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

The maximum covalency of a non-metallic group 15 element 'E' with weakest $\mathrm{E-E}$ bond is :

Identify the homoleptic complex(es) that is/are low spin.

(A) $\mathrm{[Fe(CN)_5NO]^{2-}}$ (B) $\mathrm{[CoF_6]^{3-}}$ (C) $\mathrm{[Fe(CN)_6]^{4-}}$ (D) $\mathrm{[Co(NH_3)_6]^{3+}}$ (E) $\mathrm{[Cr(H_2O)_6]^{2+}}$

Choose the correct answer from the options given below :

The correct order of the following complexes in terms of their crystal field stabilization energies is :

Given below are two statements :

Statement (I) : Nitrogen, sulphur, halogen and phosphorus present in an organic compound are detected by Lassaigne's Test.

Statement (II) : The elements present in the compound are converted from covalent form into ionic form by fusing the compound with Magnesium in Lassaigne's test.

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

When sec-butyl cyclohexane reacts with bromine in the presence of sunlight, the major product is :

The most stable carbocation from the following is :

The alkane from below having two secondary hydrogens is :

$\mathrm{RBr} \xrightarrow{\text{(i) Mg, dry ether ; (ii) } \mathrm{H_2O}}$ 2-Methylbutane

skeletal structure of 2-methylbutane drawn as the product

The maximum number of RBr producing 2-methylbutane by above sequence of reactions is __________. (Consider the structural isomers only)

Toluene (excess) $\xrightarrow{\text{(i) } \mathrm{CrO_2Cl_2,\ CS_2}\ \text{(ii) } \mathrm{H_3O^+}\ \text{(iii) } \mathrm{NaHSO_3}}$ Filter $\longrightarrow$ Residue (A)

Residue (A) $+$ HCl(dil) $\rightarrow$ Compound (B)

Structure of residue (A) and compound (B) formed respectively is :

[A] and [B]

Match the compounds (List-I) with the appropriate catalyst/reagents (List-II) for their reduction into corresponding amines :

List-I (Compound)	List-II (Catalyst/Reagent)
(A) $\mathrm{R{-}\overset{\displaystyle O}{\overset{\|}{C}}{-}NH_2}$	(I) NaOH (aqueous)
(B)

nitrobenzene, $\mathrm{C_6H_5{-}NO_2}$

| (II) $\mathrm{H_2/Ni}$ | | (C) $\mathrm{R{-}C{\equiv}N}$ | (III) $\mathrm{LiAlH_4,\ H_2O}$ | | (D)

N-alkyl phthalimide, N–R

| (IV) $\mathrm{Sn,\ HCl}$ |

Choose the correct answer from the options given below :

Identify the number of structure/s from the following which can be correlated to D-glyceraldehyde.

four Fischer projections — (A) CHO at top with $-$OH on the right at all three carbons below; (B) CHO at top, then $-$OH (right), HO$-$ (left), $-$OH (right), $-$OH (right); (C) CHO at top, then $-$OH (right), HO$-$ (left), HO$-$ (left), $-$OH (right); (D) drawn inverted with CHO at the bottom and, from top, HO$-$ (left), HO$-$ (left), $-$OH (right), HO$-$ (left)

20 mL of 2 M NaOH solution is added to 400 mL of 0.5 M NaOH solution. The final concentration of the solution is __________ $\times 10^{-2}$ M. (Nearest integer)

Consider the following cases of standard enthalpy of reaction $\left(\Delta H_r^{\circ}\ \text{in kJ mol}^{-1}\right)$

$$\mathrm{C_2H_6(g)} + \frac{7}{2}\mathrm{O_2(g)} \rightarrow 2\mathrm{CO_2(g)} + 3\mathrm{H_2O(l)} \quad \Delta H_1^{\circ} = -1550$$

$$\mathrm{C(graphite)} + \mathrm{O_2(g)} \rightarrow \mathrm{CO_2(g)} \quad \Delta H_2^{\circ} = -393.5$$

$$\mathrm{H_2(g)} + \frac{1}{2}\mathrm{O_2(g)} \rightarrow \mathrm{H_2O(l)} \quad \Delta H_3^{\circ} = -286$$

The magnitude of $\Delta H^{\circ}_{f\,\mathrm{C_2H_6(g)}}$ is __________ kJ mol$^{-1}$ (Nearest integer).

The number of electrons present in the $4d$ orbitals of Niobium (Nb) and Ruthenium (Ru) are "$x$" and "$y$" respectively. The value of $x + y$ is __________.

The compound with molecular formula $\mathrm{C_6H_6}$, which gives only one monobromo derivative and takes up four moles of hydrogen per mole for complete hydrogenation has __________ $\pi$ electrons.

The complex of $\mathrm{Ni^{2+}}$ ion and dimethyl glyoxime contains __________ number of Hydrogen (H) atoms.