JEE Main 2024 Jan 29 Shift 1 — Chemistry

The correct set of four quantum numbers for the valence electron of rubidium atom $(Z = 37)$ is :

Which of the following is not correct?

Chlorine undergoes disproportionation in alkaline medium as shown below :

$$\mathrm{a\, Cl_{2(g)} + b\, OH^-_{(aq)} \rightarrow c\, ClO^-_{(aq)} + d\, Cl^-_{(aq)} + e\, H_2O_{(l)}}$$

The values of a, b, c and d in a balanced redox reaction are respectively :

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

Assertion A : The first ionisation enthalpy decreases across a period.

Reason R : The increasing nuclear charge outweighs the shielding across the period.

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

Identify the incorrect pair from the following :

Given below are two statements :

Statement I : The electronegativity of group 14 elements from Si to Pb, gradually decreases.

Statement II : Group 14 contains non-metallic, metallic, as well as metalloid elements.

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

$\mathrm{KMnO_4}$ decomposes on heating at 513K to form $\mathrm{O_2}$ along with

In alkaline medium, $\mathrm{MnO_4^-}$ oxidises $\mathrm{I^-}$ to

In which one of the following metal carbonyls, CO forms a bridge between metal atoms?

Match List I with List II

	LIST I (Substances)		LIST II (Element Present)
A.	Ziegler catalyst	I.	Rhodium
B.	Blood Pigment	II.	Cobalt
C.	Wilkinson catalyst	III.	Iron
D.	Vitamin $\mathrm{B_{12}}$	IV.	Titanium

Choose the correct answer from the options given below:

Appearance of blood red colour, on treatment of the sodium fusion extract of an organic compound with $\mathrm{FeSO_4}$ in presence of concentrated $\mathrm{H_2SO_4}$ indicates the presence of element/s

The interaction between $\pi$ bond and lone pair of electrons present on an adjacent atom is responsible for

The difference in energy between the actual structure and the lowest energy resonance structure for the given compound is

Identify product A and product B :

a cyclohexadiene ring + $\mathrm{Cl_2}$; upper path with $h\nu$ gives Product A, lower path in $\mathrm{CCl_4}$ gives Product B

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

Assertion A : Aryl halides cannot be prepared by replacement of hydroxyl group of phenol by halogen atom.

Reason R : Phenols react with halogen acids violently.

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

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

benzene ring bearing a $\mathrm{CH{=}CH_2}$ group (styrene) $\xrightarrow{\text{(i) } \mathrm{H_2O},\, \mathrm{H}^{\oplus} \text{; (ii) } \mathrm{CrO_3} \text{; (iii) } \mathrm{H_2N{-}NH_2},\, \mathrm{KOH},\, \text{Heating}}$ A

The major product(P) in the following reaction is

benzene ring with $\mathrm{OCH_2CH_3}$ at one position and $\mathrm{CH{=}CH_2}$ at the meta position $\xrightarrow[\text{Heat}

{\text{con} \cdot \mathrm{HBr},(excess)}$ (P) major product]*

Type of amino acids obtained by hydrolysis of proteins is :

In chromyl chloride test for confirmation of $\mathrm{Cl^-}$ ion, a yellow solution is obtained. Acidification of the solution and addition of amyl alcohol and 10% $\mathrm{H_2O_2}$ turns organic layer blue indicating formation of chromium pentoxide. The oxidation state of chromium in that is

The arenium ion which is not involved in the bromination of Aniline is ________.

A solution of $\mathrm{H_2SO_4}$ is 31.4% $\mathrm{H_2SO_4}$ by mass and has a density of $1.25\,\mathrm{g/mL}$.

The molarity of the $\mathrm{H_2SO_4}$ solution is ________ M (nearest integer)

[Given molar mass of $\mathrm{H_2SO_4} = 98\,\mathrm{g\ mol^{-1}}$]

The number of species from the following which are paramagnetic and with bond order equal to one is ________.

$\mathrm{H_2},\ \mathrm{He_2^+},\ \mathrm{O_2^+},\ \mathrm{N_2^{2-}},\ \mathrm{O_2^{2-}},\ \mathrm{F_2},\ \mathrm{Ne_2^+},\ \mathrm{B_2}$

Number of compounds with one lone pair of electrons on central atom amongst following is __________

$\mathrm{O_3},\ \mathrm{H_2O},\ \mathrm{SF_4},\ \mathrm{ClF_3},\ \mathrm{NH_3},\ \mathrm{BrF_5},\ \mathrm{XeF_4}$

The osmotic pressure of a dilute solution is $7 \times 10^5\,\mathrm{Pa}$ at 273K. Osmotic pressure of the same solution at 283K is ________ $\times 10^4\,\mathrm{Nm^{-2}}$.

For the reaction $\mathrm{N_2O_{4(g)} \rightleftharpoons 2NO_{2(g)}}$, $K_p = 0.492$ atm at 300K. $K_c$ for the reaction at same temperature is ________ $\times 10^{-2}$.

(Given : $R = 0.082\,\mathrm{L\ atm\ mol^{-1}\ K^{-1}}$)

The mass of zinc produced by the electrolysis of zinc sulphate solution with a steady current of 0.015 A for 15 minutes is ________ $\times 10^{-4}$ g.

(Atomic mass of zinc = 65.4 amu)

For a reaction taking place in three steps at same temperature, overall rate constant $K = \frac{K_1 K_2}{K_3}$. If $E_{a_1}$, $E_{a_2}$ and $E_{a_3}$ are 40, 50 and 60 kJ/mol respectively, the overall $E_a$ is ______ kJ/mol.

Number of compounds among the following which contain sulphur as heteroatom is ________.

Furan, Thiophene, Pyridine, Pyrrole, Cysteine, Tyrosine

$$\mathrm{\underset{H}{\overset{CH_3}{\phantom{|}}}\!C{=}C\!\overset{H}{\underset{CH_3}{\phantom{|}}} \xrightarrow[\text{(ii) } Zn + H_2O]{\text{(i) } O_3} (P)\ \text{Product}}$$

but-2-ene, $\mathrm{CH_3(H)C{=}C(H)CH_3}$, undergoing (i) $\mathrm{O_3}$ (ii) $\mathrm{Zn + H_2O}$ to give product (P)

Consider the given reaction. The total number of oxygen atom/s present per molecule of the product (P) is ______.

From the compounds given below, number of compounds which give positive Fehling's test is ________.

Benzaldehyde, Acetaldehyde, Acetone, Acetophenone, Methanal, 4-nitrobenzaldehyde, cyclohexane carbaldehyde.