JEE Main 2024 Apr 6 Shift 2 — Chemistry

Molality (m) of 3 M aqueous solution of NaCl is : (Given : Density of solution $= 1.25\ \mathrm{g\ mL^{-1}}$, Molar mass in $\mathrm{g\ mol^{-1}}$ : Na-23, Cl-35.5)

Given below are two statements :

Statement I : $\mathrm{PF_5}$ and $\mathrm{BrF_5}$ both exhibit $\mathrm{sp^3d}$ hybridisation.

Statement II : Both $\mathrm{SF_6}$ and $\mathrm{[Co(NH_3)_6]^{3+}}$ exhibit $\mathrm{sp^3d^2}$ hybridisation.

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

The ratio $\frac{K_P}{K_C}$ for the reaction :

$$\mathrm{CO_{(g)} + \frac{1}{2} O_{2(g)} \rightleftharpoons CO_{2(g)}}$$ is :

Match List - I with List - II.

List - I (Reaction)	List - II (Type of redox reaction)
(A) $\mathrm{N_{2(g)} + O_{2(g)} \to 2NO_{(g)}}$	(I) Decomposition
(B) $\mathrm{2Pb(NO_3)_{2(s)} \to 2PbO_{(s)} + 4NO_{2(g)} + O_{2(g)}}$	(II) Displacement
(C) $\mathrm{2Na_{(s)} + 2H_2O_{(l)} \to 2NaOH_{(aq.)} + H_{2(g)}}$	(III) Disproportionation
(D) $\mathrm{2NO_{2(g)} + 2\,{}^-OH_{(aq.)} \to NO^-_{2(aq.)} + NO^-_{3(aq.)} + H_2O_{(l)}}$	(IV) Combination

Choose the correct answer from the options given below :

How can an electrochemical cell be converted into an electrolytic cell ?

Match List - I with List - II.

List - I (Alkali Metal)	List - II (Emission Wavelength in nm)
(A) Li	(I) 589.2
(B) Na	(II) 455.5
(C) Rb	(III) 670.8
(D) Cs	(IV) 780.0

Choose the correct answer from the options given below :

The number of ions from the following that are expected to behave as oxidising agent is : $\mathrm{Sn^{4+}}$, $\mathrm{Sn^{2+}}$, $\mathrm{Pb^{2+}}$, $\mathrm{Tl^{3+}}$, $\mathrm{Pb^{4+}}$, $\mathrm{Tl^{+}}$

Evaluate the following statements related to group 14 elements for their correctness. (A) Covalent radius decreases down the group from C to Pb in a regular manner. (B) Electronegativity decreases from C to Pb down the group gradually. (C) Maximum covalence of C is 4 whereas other elements can expand their covalence due to presence of d orbitals. (D) Heavier elements do not form $p\pi$-$p\pi$ bonds. (E) Carbon can exhibit negative oxidation states.

Choose the correct answer from the options given below :

Arrange the following elements in the increasing order of number of unpaired electrons in it. (A) Sc (B) Cr (C) V (D) Ti (E) Mn

Choose the correct answer from the options given below :

The correct IUPAC name of $\mathrm{[PtBr_2(PMe_3)_2]}$ is :

Match List - I with List - II.

List - I (Tetrahedral Complex)	List - II (Electronic configuration)
(A) $\mathrm{TiCl_4}$	(I) $e^2, t_2^0$
(B) $\mathrm{[FeO_4]^{2-}}$	(II) $e^4, t_2^3$
(C) $\mathrm{[FeCl_4]^{-}}$	(III) $e^0, t_2^0$
(D) $\mathrm{[CoCl_4]^{2-}}$	(IV) $e^2, t_2^3$

Choose the correct answer from the options given below :

During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in $\mathrm{NH_4OH}$ solution when sodium carbonate extract was first acidified with dil. $\mathrm{HNO_3}$ and then $\mathrm{AgNO_3}$ solution was added. This indicates presence of :

The correct statement among the following, for a "chromatography" purification method is :

four benzene rings — (I) with $\mathrm{CH_3}$ substituent (toluene), (II) unsubstituted (benzene), (III) with $\mathrm{OCH_3}$ substituent (anisole), (IV) with $\mathrm{CF_3}$ substituent

The correct arrangement for decreasing order of electrophilic substitution for above compounds is :

The incorrect statement regarding the geometrical isomers of 2-butene is :

cyclohexane ring attached to $\mathrm{CH(Cl)CH_2CH_3}$, i.e. (1-chloropropyl)cyclohexane

$+ \mathrm{NaOH} \xrightarrow{\mathrm{H_2O}}$ Major Product "A"

Consider the above chemical reaction. Product "A" is :

Identify the product (A) in the following reaction.

benzene ring with $\mathrm{NH_2}$ group (aniline)

$\xrightarrow{\substack{\text{(i) } \mathrm{NaNO_2 + HCl} \\ \text{(ii) } \mathrm{Cu_2Cl_2} \\ \text{(iii) } \mathrm{NaOH},\ 623\ \mathrm{K},\ 300\ \mathrm{atm} \\ \text{(iv) } \mathrm{H^+}}}$ (A)

Consider the given reaction, identify the major product P.

$$\mathrm{CH_3{-}COOH} \xrightarrow{\substack{\text{(i) } \mathrm{LiAlH_4}\ \ \text{(ii) PCC}\ \ \text{(iii) } \mathrm{HCN/\bar{O}H} \\ \text{(iv) } \mathrm{H_2O/\bar{O}H},\ \Delta}} \text{"P"}$$

The major products formed :

benzene ring with $\mathrm{OCH_3}$ group (anisole)

$\xrightarrow{\mathrm{HNO_3,\ H_2SO_4}}$ 'A' $\xrightarrow[\mathrm{Fe}]{\mathrm{Br_2\ (excess)}}$ 'B'

A and B respectively are :

The incorrect statements regarding enzymes are : (A) Enzymes are biocatalysts. (B) Enzymes are non-specific and can catalyse different kinds of reactions. (C) Most Enzymes are globular proteins. (D) Enzyme - oxidase catalyses the hydrolysis of maltose into glucose.

Choose the correct answer from the option given below :

For hydrogen atom, energy of an electron in first excited state is $-3.4$ eV. K.E. of the same electron of hydrogen atom is $x$ eV. Value of $x$ is ________ $\times 10^{-1}$ eV. (Nearest integer)

Total number of species from the following with central atom utilising $\mathrm{sp^2}$ hybrid orbitals for bonding is ________.

$\mathrm{NH_3}$, $\mathrm{SO_2}$, $\mathrm{SiO_2}$, $\mathrm{BeCl_2}$, $\mathrm{C_2H_2}$, $\mathrm{C_2H_4}$, $\mathrm{BCl_3}$, $\mathrm{HCHO}$, $\mathrm{C_6H_6}$, $\mathrm{BF_3}$, $\mathrm{C_2H_4Cl_2}$

For the reaction at 298 K, $\mathrm{2A + B \to C}$. $\Delta H = 400\ \mathrm{kJ\ mol^{-1}}$ and $\Delta S = 0.2\ \mathrm{kJ\ mol^{-1}\ K^{-1}}$. The reaction will become spontaneous above ________ K.

When '$x$' $\times 10^{-2}$ mL methanol (molar mass $= 32$ g; density $= 0.792\ \mathrm{g/cm^3}$) is added to 100 mL water (density $= 1\ \mathrm{g/cm^3}$), the following diagram is obtained.

vapour pressure vs temperature graph showing curves for the frozen system, water and methanolic solution; the water curve meets the frozen-system curve at 273.15 K and the methanolic solution curve at 270.65 K

$x =$ ________ (nearest integer).

[Given : Molal freezing point depression constant of water at 273.15 K is $1.86\ \mathrm{K\ kg\ mol^{-1}}$]

Consider the two different first order reactions given below

$\mathrm{A + B \to C}$ (Reaction 1)

$\mathrm{P \to Q}$ (Reaction 2)

The ratio of the half life of Reaction 1 : Reaction 2 is $5 : 2$. If $t_1$ and $t_2$ represent the time taken to complete $\frac{2}{3}^{\mathrm{rd}}$ and $\frac{4}{5}^{\mathrm{th}}$ of Reaction 1 and Reaction 2, respectively, then the value of the ratio $t_1 : t_2$ is ________ $\times 10^{-1}$ (nearest integer).

[Given : $\log_{10}(3) = 0.477$ and $\log_{10}(5) = 0.699$]

Among $\mathrm{VO_2^{+}}$, $\mathrm{MnO_4^{-}}$ and $\mathrm{Cr_2O_7^{2-}}$, the spin-only magnetic moment value of the species with least oxidising ability is ________ BM (Nearest integer).

(Given atomic member V $= 23$, Mn $= 25$, Cr $= 24$)

Consider the following reactions

$$\mathrm{NiS + HNO_3 + HCl \to A + NO + S + H_2O}$$

$$\mathrm{A + NH_4OH + \underset{\underset{\displaystyle \mathrm{H_3C{-}C{=}N{-}OH}}{|}}{H_3C{-}C{=}N{-}OH} \to B + NH_4Cl + H_2O}$$

The number of protons that do not involve in hydrogen bonding in the product B is ________.

Number of carbocations from the following that are not stabilized by hyperconjugation is ________.

seven carbocations — (1) a skeletal branched alkyl carbocation with the positive charge on a chain carbon bearing a methyl branch, (2) a $\mathrm{\overset{\oplus}{C}H}$ carbocation bonded to two tert-butyl groups, labelled (tert.-Butyl)(tert.-Butyl), (3) $\mathrm{\overset{+}{C}H_3}$, (4) cyclopentadienyl cation (five-membered ring with two double bonds and $+$ charge), (5) $\mathrm{\overset{+}{C}H_2{-}OCH_3}$, (6) tert-butyl cation (skeletal isobutyl skeleton with $+$ on central carbon), (7) $\mathrm{(CH_3)_2N{-}\overset{+}{C}H_2}$

benzene ring with $\mathrm{OC_2H_5}$ group (ethoxybenzene)

$\xrightarrow{\mathrm{HNO_3,\ H_2SO_4}}$ P (major product) $\xrightarrow{\mathrm{2Br_2,\ Fe}}$ Q (major product)

The ratio of number of oxygen atoms to bromine atoms in the product Q is ________ $\times 10^{-1}$.

An amine (X) is prepared by ammonolysis of benzyl chloride. On adding p-toluenesulphonyl chloride to it the solution remains clear. Molar mass of the amine (X) formed is ________ $\mathrm{g\ mol^{-1}}$.

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