JEE Main 2024 Jan 30 Shift 1 — Chemistry

Given below are two statements :

Statement (I) : The orbitals having same energy are called as degenerate orbitals.

Statement (II) : In hydrogen atom, 3p and 3d orbitals are not degenerate orbitals.

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

Match List - I with List - II.

List - I (Molecule)	List - II (Shape)
(A) $\mathrm{BrF_5}$	(I) T-shape
(B) $\mathrm{H_2O}$	(II) See saw
(C) $\mathrm{ClF_3}$	(III) Bent
(D) $\mathrm{SF_4}$	(IV) Square pyramidal

Choose the correct answer from the options given below :

What happens to freezing point of benzene when small quantity of napthalene is added to benzene ?

Aluminium chloride in acidified aqueous solution forms an ion having geometry

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : There is a considerable increase in covalent radius from N to P. However from As to Bi only a small increase in covalent radius is observed.

Reason (R) : Covalent and ionic radii in a particular oxidation state increases down the group.

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

Match List - I with List - II.

List - I (Species)	List - II (Electronic distribution)
(A) $\mathrm{Cr^{+2}}$	(I) $\mathrm{3d^8}$
(B) $\mathrm{Mn^{+}}$	(II) $\mathrm{3d^3 4s^1}$
(C) $\mathrm{Ni^{+2}}$	(III) $\mathrm{3d^4}$
(D) $\mathrm{V^{+}}$	(IV) $\mathrm{3d^5 4s^1}$

Choose the correct answer from the options given below :

Diamagnetic Lanthanoid ions are :

Choose the correct statements from the following :

(A) Ethane-1, 2-diamine is a chelating ligand.

(B) Metallic aluminium is produced by electrolysis of aluminium oxide in presence of cryolite.

(C) Cyanide ion is used as ligand for leaching of silver.

(D) Phosphine act as a ligand in Wilkinson catalyst.

(E) The stability constants of $\mathrm{Ca^{2+}}$ and $\mathrm{Mg^{2+}}$ are similar with EDTA complexes.

Choose the correct answer from the options given below :

The Lassiagne's extract is boiled with dil $\mathrm{HNO_3}$ before testing for halogens because,

Structure of 4-Methylpent-2-enal is :

Which of the following molecule/species is most stable ?

Compound A formed in the following reaction reacts with B gives the product C. Find out A and B.

$$\mathrm{CH_3{-}C{\equiv}CH + Na \longrightarrow A \xrightarrow{B} \underset{(C)}{CH_3{-}C{\equiv}C{-}CH_2{-}CH_2{-}CH_3} + NaBr}$$

Example of vinylic halide is :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : $\mathrm{CH_2{=}CH{-}CH_2{-}Cl}$ is an example of allyl halide.

Reason (R) : Allyl halides are the compounds in which the halogen atom is attached to sp$^2$ hybridised carbon atom.

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

In the given reactions, identify the reagent A and reagent B.

toluene ($\mathrm{C_6H_5CH_3}$) converted to benzaldehyde ($\mathrm{C_6H_5CHO}$) by two routes — Route 1: "A" + $\mathrm{(CH_3CO)_2O}$, 273–283 K $\rightarrow$ [Intermediate

$\xrightarrow{\mathrm{H_3O^+},\ \Delta}$ benzaldehyde; Route 2: "B" + $\mathrm{CS_2}$ $\rightarrow$ [Intermediate] $\xrightarrow{\mathrm{H_3O^+}}$ benzaldehyde]*

$$\mathrm{C_6H_5COCl \xrightarrow[\text{Pd-BaSO}_4]{H_2} C_6H_5CHO}$$

This reduction reaction is known as :

The final product A, formed in the following multistep reaction sequence is :

$$\mathrm{C_6H_5Br} \xrightarrow{\substack{\text{(i) Mg, ether then } \mathrm{CO_2},\ \mathrm{H^+} \\ \text{(ii) } \mathrm{NH_3},\ \Delta \\ \text{(iii) } \mathrm{Br_2},\ \mathrm{NaOH}}} A$$

Sugar which does not give reddish brown precipitate with Fehling's reagent, is :

Given below are two statements :

Statement (I) : The gas liberated on warming a salt with dil $\mathrm{H_2SO_4}$, turns a piece of paper dipped in lead acetate into black, it is a confirmatory test for sulphide ion.

Statement (II) : In statement-I the colour of paper turns black because of formation of lead sulphite.

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

Following is a confirmatory test for aromatic primary amines. Identify reagent (A) and (B).

$$\mathrm{C_6H_5NH_2 \xrightarrow{(A)} C_6H_5\overset{\oplus}{N_2}\overset{\ominus}{Cl} \xrightarrow[\text{NaOH}]{(B)} \text{Scarlet red dye}}$$

The mass of sodium acetate ($\mathrm{CH_3COONa}$) required to prepare 250 mL of 0.35 M aqueous solution is ________ g. (Molar mass of $\mathrm{CH_3COONa}$ is 82.02 $\mathrm{g\ mol^{-1}}$)

The total number of molecular orbitals formed from 2s and 2p atomic orbitals of a diatomic molecule is ________.

P–V diagram with V ($\mathrm{dm^3}$) on the y-axis and P (kPa) on the x-axis; point A at (10 kPa, 10 $\mathrm{dm^3}$), point B at (10 kPa, 30 $\mathrm{dm^3}$), point C at (30 kPa, 10 $\mathrm{dm^3}$); path A$\to$B vertical (constant P), B$\to$C straight diagonal, C$\to$A horizontal (constant V)

An ideal gas undergoes a cyclic transformation starting from the point A and coming back to the same point by tracing the path A$\to$B$\to$C$\to$A as shown in the diagram above. The total work done in the process is ________ J.

The pH at which $\mathrm{Mg(OH)_2}$ $[\mathrm{K_{sp}} = 1 \times 10^{-11}]$ begins to precipitate from a solution containing 0.10 M $\mathrm{Mg^{2+}}$ ions is ________.

$$\mathrm{2MnO_4^- + bI^- + cH_2O \rightarrow x\,I_2 + y\,MnO_2 + z\,\overline{O}H}$$

If the above equation is balanced with integer coefficients, the value of z is ________.

0.05 cm thick coating of silver is deposited on a plate of 0.05 $\mathrm{m^2}$ area. The number of silver atoms deposited on plate are ________ $\times 10^{23}$. (At mass Ag = 108, d = 7.9 $\mathrm{g\ cm^{-3}}$)

The rate of First order reaction is 0.04 $\mathrm{mol\ L^{-1}\ s^{-1}}$ at 10 minutes and 0.03 $\mathrm{mol\ L^{-1}\ s^{-1}}$ at 20 minutes after initiation. Half life of the reaction is ________ minutes. (Given log2 = 0.3010, log3 = 0.4771)

If IUPAC name of an element is "Unununnium" then the element belongs to n$^{th}$ group of Periodic table. The value of n is ________.

On a thin layer chromatographic plate, an organic compound moved by 3.5 cm, while the solvent moved by 5 cm. The retardation factor of the organic compound is ________ $\times 10^{-1}$.

The compound formed by the reaction of ethanal with semicarbazide contains ________ number of nitrogen atoms.