JEE Main 2024 Apr 8 Shift 2 — Chemistry

When $\psi_A$ and $\psi_B$ are the wave functions of atomic orbitals, then $\sigma^*$ is represented by :

Given below are two statements :

Statement (I) : A Buffer solution is the mixture of a salt and an acid or a base mixed in any particular quantities.

Statement (II) : Blood is naturally occurring buffer solution whose pH is maintained by $\mathrm{H_2CO_3/HCO_3^{\ominus}}$ concentrations.

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

The emf of cell $\mathrm{Tl}\left|\underset{(0.001\,\mathrm{M})}{\mathrm{Tl}^{+}}\right\|\left.\underset{(0.01\,\mathrm{M})}{\mathrm{Cu}^{2+}}\right|\mathrm{Cu}$ is 0.83 V at 298 K. It could be increased by :

The reaction ;

$$\frac{1}{2}\mathrm{H_{2(g)}} + \mathrm{AgCl_{(s)}} \rightarrow \mathrm{H^+_{(aq)}} + \mathrm{Cl^-_{(aq)}} + \mathrm{Ag_{(s)}}$$

occurs in which of the following galvanic cell :

For a reaction $\mathrm{A} \xrightarrow{K_1} \mathrm{B} \xrightarrow{K_2} \mathrm{C}$

If the rate of formation of B is set to be zero then the concentration of B is given by :

Identify the correct statements about p-block elements and their compounds.

(A) Non metals have higher electronegativity than metals.

(B) Non metals have lower ionisation enthalpy than metals.

(C) Compounds formed between highly reactive nonmetals and highly reactive metals are generally ionic.

(D) The non-metal oxides are generally basic in nature.

(E) The metal oxides are generally acidic or neutral in nature.

Choose the correct answer from the options given below :

Identify the incorrect statements about group 15 elements :

(A) Dinitrogen is a diatomic gas which acts like an inert gas at room temperature.

(B) The common oxidation states of these elements are $-3$, $+3$ and $+5$.

(C) Nitrogen has unique ability to form $\mathrm{p\pi - p\pi}$ multiple bonds.

(D) The stability of $+5$ oxidation states increases down the group.

(E) Nitrogen shows a maximum covalency of 6.

Choose the correct answer from the options given below :

The equilibrium $\mathrm{Cr_2O_7^{2-}} \rightleftharpoons 2\mathrm{CrO_4^{2-}}$ is shifted to the right in :

Given below are two statements :

Statement (I) : Fusion of $\mathrm{MnO_2}$ with KOH and an oxidising agent gives dark green $\mathrm{K_2MnO_4}$.

Statement (II) : Manganate ion on electrolytic oxidation in alkaline medium gives permanganate ion.

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

Match List - I with List - II.

List - I (Complex ion)	List - II (Spin only magnetic moment in B.M.)
(A) $\mathrm{[Cr(NH_3)_6]^{3+}}$	(I) 4.90
(B) $\mathrm{[NiCl_4]^{2-}}$	(II) 3.87
(C) $\mathrm{[CoF_6]^{3-}}$	(III) 0.0
(D) $\mathrm{[Ni(CN)_4]^{2-}}$	(IV) 2.83

Choose the correct answer from the options given below :

In qualitative test for identification of presence of phosphorous, the compound is heated with an oxidising agent. Which is further treated with nitric acid and ammonium molybdate respectively. The yellow coloured precipitate obtained is :

Given below are two statements :

Statement (I) : Kjeldahl method is applicable to estimate nitrogen in pyridine.

Statement (II) : The nitrogen present in pyridine can easily be converted into ammonium sulphate in Kjeldahl method.

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

The shape of carbocation is :

IUPAC name of following hydrocarbon (X) is :

$$\underset{\underset{\mathrm{CH_3}}{|}}{\mathrm{CH_3-CH}}-\mathrm{CH_2-CH_2}-\underset{\underset{\mathrm{CH_3}}{|}}{\mathrm{CH}}-\underset{\underset{\mathrm{CH_3}}{|}}{\mathrm{CH}}-\mathrm{CH_2-CH_3}$$

(X)

Given below are two statements :

Statement (I) : $\mathrm{S_N2}$ reactions are 'stereospecific', indicating that they result in the formation of only one stereo-isomer as the product.

Statement (II) : $\mathrm{S_N1}$ reactions generally result in formation of product as racemic mixtures.

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

The correct sequence of acidic strength of the following aliphatic acids in their decreasing order is :

$\mathrm{CH_3CH_2COOH}$, $\mathrm{CH_3COOH}$, $\mathrm{CH_3CH_2CH_2COOH}$, $\mathrm{HCOOH}$

Match List - I with List - II.

List-I shows four benzene-ring reactions and List-II shows four products as structures

List - I (Reactions) :

(A) Aniline $\xrightarrow{\text{(i) } \mathrm{NaNO_2 + HCl} \text{; (ii) } \mathrm{H_2O}, \text{ warm}}$

(B) Phenol $\xrightarrow{\mathrm{Na_2Cr_2O_7,\ H_2SO_4}}$

(C) Phenol $\xrightarrow{\text{(i) } \mathrm{CHCl_3 + aq\ NaOH} \text{; (ii) } \mathrm{H^+}}$

(D) Phenol $\xrightarrow{\text{(i) } \mathrm{NaOH} \text{; (ii) } \mathrm{CO_2} \text{; (iii) } \mathrm{H^+}}$

List - II (Products) :

(I) 2-hydroxybenzaldehyde (salicylaldehyde)

(II) phenol

(III) 2-hydroxybenzoic acid (salicylic acid)

(IV) benzoquinone (cyclohexa-2,5-diene-1,4-dione)

Choose the correct answer from the options given below :

Which one the following compounds will readily react with dilute NaOH ?

Given below are two statements :

Statement (I) : All the following compounds react with p-toluenesulfonyl chloride.

$\mathrm{C_6H_5NH_2}$ $\quad$ $\mathrm{(C_6H_5)_2NH}$ $\quad$ $\mathrm{(C_6H_5)_3N}$

Statement (II) : Their products in the above reaction are soluble is aqueous NaOH.

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

Match List - I with List - II.

List - I (Test)	List - II (Identification)
(A) Bayer's test	(I) Phenol
(B) Ceric ammonium nitrate test	(II) Aldehyde
(C) Phthalein dye test	(III) Alcoholic-OH group
(D) Schiff's test	(IV) Unsaturation

Choose the correct answer from the options given below :

A solution is prepared by adding 1 mole ethyl alcohol in 9 mole water. The mass percent of solute in the solution is ________ (Integer answer) (Given : Molar mass in $\mathrm{g\ mol^{-1}}$ Ethyl alcohol : 46 water : 18)

Wavenumber for a radiation having 5800 $\mathrm{\AA}$ wavelength is $x \times 10\ \mathrm{cm^{-1}}$. The value of $x$ is ______. (Integer answer)

Number of molecules having bond order 2 from the following molecules is ________.

$\mathrm{C_2,\ O_2,\ Be_2,\ Li_2,\ Ne_2,\ N_2,\ He_2}$

$\Delta_{\mathrm{vap}}\mathrm{H^{\ominus}}$ for water is $+40.79\ \mathrm{kJ\ mol^{-1}}$ at 1 bar and 100 $^{\circ}\mathrm{C}$. Change in internal energy for this vapourisation under same condition is ________ $\mathrm{kJ\ mol^{-1}}$. (Integer answer)

(Given $R = 8.3\ \mathrm{JK^{-1}\ mol^{-1}}$)

Molality of an aqueous solution of urea is 4.44 m. Mole fraction of urea in solution is $x \times 10^{-3}$. Value of $x$ is ________. (Integer answer)

Two moles of benzaldehyde and one mole of acetone under alkaline conditions using aqueous NaOH after heating gives $x$ as the major product. The number of $\pi$ bonds in the product $x$ is ________.

Total number of unpaired electrons in the complex ions $\mathrm{[Co(NH_3)_6]^{3+}}$ and $\mathrm{[NiCl_4]^{2-}}$ is ________.

Total number of aromatic compounds among the following compounds is ________.

six ring structures — (1) a bicyclic decalin-like ring system with non-conjugated double bonds (isomer of naphthalene with broken conjugation), (2) two cyclopentadiene rings joined by an exocyclic C=C double bond (fulvalene-type), (3) cyclopentadienyl cation (five-membered ring with positive charge), (4) cyclooctatetraene, (5) pyridine (six-membered ring with N lone pair), (6) cycloheptatriene

Total number of optically active compounds from the following is __________.

structures — (1) 2,3-dimethylbutane-2,3-diol shown as a Fischer-type projection ($\mathrm{CH_3-C(OH)(H)}$ over $\mathrm{C(OH)(H)-CH_3}$; both carbons bear H and OH), (2) hexane-2,3,4-triol skeletal structure with OH at C2, C3, C4

and the condensed formulas: $\mathrm{CH_3-CH_2-CH_2-CH_2-OH}$, $\mathrm{CH_3-CH_2-\underset{\underset{\mathrm{Cl}}{|}}{CH}-CH_3}$, $\mathrm{CH_3-CH_2-CH_2-CH_2-Cl}$, $\mathrm{(CH_3)_2CH-CH_2-CH_2-Cl}$

The total number of carbon atoms present in tyrosine, an amino acid, is __________.