JEE Main 2024 Jan 31 Shift 2 — Chemistry

A sample of $\mathrm{CaCO_3}$ and $\mathrm{MgCO_3}$ weighed $2.21\ \mathrm{g}$ is ignited to constant weight of $1.152\ \mathrm{g}$. The composition of mixture is :

(Given molar mass in $\mathrm{g\ mol^{-1}}$ $\mathrm{CaCO_3}$ : 100, $\mathrm{MgCO_3}$ : 84)

The four quantum numbers for the electron in the outer most orbital of potassium (atomic no. 19) are

Which of the following is least ionic?

$\mathrm{A_{(g)}} \rightleftharpoons \mathrm{B_{(g)}} + \frac{\mathrm{C}}{2}_{\mathrm{(g)}}$ The correct relationship between $\mathrm{K_P}$, $\alpha$ and equilibrium pressure $\mathrm{P}$ is

Given below are two statements :

Statement I : $\mathrm{S_8}$ solid undergoes disproportionation reaction under alkaline conditions to form $\mathrm{S^{2-}}$ and $\mathrm{S_2O_3^{2-}}$.

Statement II : $\mathrm{ClO_4^-}$ can undergo disproportionation reaction under acidic condition.

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

Consider the following elements.

$$\text{Group} \downarrow \quad \begin{matrix} \mathrm{A'} & \mathrm{B'} \\ \mathrm{C'} & \mathrm{D'} \end{matrix} \quad \rightarrow \text{Period}$$

(A′ and B′ lie in the same period with B′ to the right of A′; C′ and D′ lie in the next period directly below A′ and B′ respectively.)

Which of the following is/are true about A′, B′, C′ and D′?

A. Order of atomic radii: B′ < A′ < D′ < C′ B. Order of metallic character: B′ < A′ < D′ < C′ C. Size of the element: D′ < C′ < B′ < A′ D. Order of ionic radii: B′⁺ < A′⁺ < D′⁺ < C′⁺

Choose the correct answer from the options given below :

Given below are two statements :

Statement I : Group 13 trivalent halides get easily hydrolyzed by water due to their covalent nature.

Statement II : $\mathrm{AlCl_3}$ upon hydrolysis in acidified aqueous solution forms octahedral $\mathrm{[Al(H_2O)_6]^{3+}}$ ion.

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

Choose the correct statements from the following

A. All group 16 elements form oxides of general formula $\mathrm{EO_2}$ and $\mathrm{EO_3}$, where E = S, Se, Te and Po. Both the types of oxides are acidic in nature. B. $\mathrm{TeO_2}$ is an oxidising agent while $\mathrm{SO_2}$ is reducing in nature. C. The reducing property decreases from $\mathrm{H_2S}$ to $\mathrm{H_2Te}$ down the group. D. The ozone molecule contains five lone pairs of electrons.

Choose the correct answer from the options given below:

Choose the correct statements from the following

A. $\mathrm{Mn_2O_7}$ is an oil at room temperature B. $\mathrm{V_2O_4}$ reacts with acid to give $\mathrm{VO_2^{2+}}$ C. $\mathrm{CrO}$ is a basic oxide D. $\mathrm{V_2O_5}$ does not react with acid

Choose the correct answer from the options given below :

Select the option with correct property -

Match List I with List II

	LIST I (Complex ion)		LIST II (Electronic Configuration)
A.	$\mathrm{[Cr(H_2O)_6]^{3+}}$	I.	$t_{2g}^{2}\,e_g^{0}$
B.	$\mathrm{[Fe(H_2O)_6]^{3+}}$	II.	$t_{2g}^{3}\,e_g^{0}$
C.	$\mathrm{[Ni(H_2O)_6]^{2+}}$	III.	$t_{2g}^{3}\,e_g^{2}$
D.	$\mathrm{[V(H_2O)_6]^{3+}}$	IV.	$t_{2g}^{6}\,e_g^{2}$

Choose the correct answer from the options given below:

The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flowers is -

The correct order of reactivity in electrophilic substitution reaction of the following compounds is :

four benzene-ring structures — A: benzene, B: toluene ($\mathrm{C_6H_5CH_3}$), C: chlorobenzene ($\mathrm{C_6H_5Cl}$), D: nitrobenzene ($\mathrm{C_6H_5NO_2}$)

Identify structure of 2,3–dibromo–1–phenylpentane.

Major product of the following reaction is -

1-methylcyclopent-1-ene treated with $\mathrm{D-Cl}$

$$\text{1-methylcyclopentene} \xrightarrow{\mathrm{D-Cl}} ?$$

Identify A and B in the following reaction sequence.

$$\text{Bromobenzene} \xrightarrow{\text{Conc } \mathrm{HNO_3}} \mathrm{A} \xrightarrow[\text{(ii) } \mathrm{HCl}]{\text{(i) } \mathrm{NaOH}} \mathrm{B}$$

reaction scheme starting from bromobenzene

Identify major product 'P' formed in the following reaction.

$$\mathrm{C_6H_6} + \mathrm{C_6H_5COCl} \xrightarrow{\text{Anhydrous } \mathrm{AlCl_3}} \text{'P' (Major Product)}$$

benzene plus benzoyl chloride reaction scheme

Identify the name reaction.

$$\mathrm{C_6H_6} \xrightarrow[\text{Anhyd. } \mathrm{AlCl_3/CuCl}]{\mathrm{CO,\ HCl}} \mathrm{C_6H_5CHO}$$

Given below are two statements :

Statement I : Aniline reacts with con. $\mathrm{H_2SO_4}$, followed by heating at 453 - 473 K gives p-aminobenzene sulphonic acid, which gives blood red colour in the 'Lassaigne's test'.

Statement II : In Friedel - Craft's alkylation and acylation reactions, aniline forms salt with the $\mathrm{AlCl_3}$ catalyst. Due to this, nitrogen of aniline aquires a positive charge and acts as deactivating group.

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

The azo-dye ($Y$) formed in the following reactions is

Sulphanilic acid + $\mathrm{NaNO_2}$ + $\mathrm{CH_3COOH}$ → X.

$$\mathrm{X} + \text{naphthalen-1-amine} \longrightarrow \mathrm{Y}$$

X reacting with 1-aminonaphthalene (naphthalene with $\mathrm{NH_2}$ at position 1)

A diatomic molecule has a dipole moment of 1.2 D. If the bond distance is $1\ \mathrm{\AA}$, then fractional charge on each atom is _______ $\times 10^{-1}$ esu.

(Given 1 D = $10^{-18}$ esucm)

If 5 moles of an ideal gas expands from 10 L to a volume of 100 L at 300 K under isothermal and reversible condition then work, w, is $-x$ J. The value of $x$ is _________.

(Given $\mathrm{R} = 8.314\ \mathrm{J\ K^{-1}\ mol^{-1}}$)

The molarity of 1 L orthophosphoric acid ($\mathrm{H_3PO_4}$) having 70% purity by weight (specific gravity $1.54\ \mathrm{g\ cm^{-3}}$) is ________ M.

(Molar mass of $\mathrm{H_3PO_4}$ = $98\ \mathrm{g\ mol^{-1}}$)

The values of conductivity of some materials at 298.15 K in $\mathrm{S\ m^{-1}}$ are $2.1 \times 10^{3}$, $1.0 \times 10^{-16}$, $1.2 \times 10$, $3.91$, $1.5 \times 10^{-2}$, $1 \times 10^{-7}$, $1.0 \times 10^{3}$. The number of conductors among the materials is ________.

$r = k\,[\mathrm{A}]$ for a reaction, 50% of A is decomposed in 120 minutes. The time taken for 90% decomposition of A is ________ minutes.

Number of moles of $\mathrm{H^+}$ ions required by 1 mole of $\mathrm{MnO_4^-}$ to oxidise oxalate ion to $\mathrm{CO_2}$ is _______.

Number of isomeric products formed by monochlorination of 2-methylbutane in presence of sunlight is ________.

A compound ($x$) with molar mass $108\ \mathrm{g\ mol^{-1}}$ undergoes acetylation to give product with molar mass $192\ \mathrm{g\ mol^{-1}}$. The number of amino groups in the compund ($x$) is _______.

From the vitamins A, $\mathrm{B_1}$, $\mathrm{B_6}$, $\mathrm{B_{12}}$, C, D, E and K, the number of vitamins that can be stored in our body is________.

In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is (+)________.