JEE Main 2024 Jan 31 Shift 1 — Chemistry

The linear combination of atomic orbitals to form molecular orbitals takes place only when the combining atomic orbitals

A. have the same energy B. have the minimum overlap C. have same symmetry about the molecular axis D. have different symmetry about the molecular axis

Choose the most appropriate from the options given below:

Identify the mixture that shows positive deviations from Raoult's Law

For the given reaction, choose the correct expression of $\mathrm{K_C}$ from the following :-

$$\mathrm{Fe^{3+}_{(aq)} + SCN^-_{(aq)} \rightleftharpoons (FeSCN)^{2+}_{(aq)}}$$

Identify the factor from the following that does not affect electrolytic conductance of a solution.

Integrated rate law equation for a first order gas phase reaction is given by

(where $\mathrm{P_i}$ is initial pressure and $\mathrm{P_t}$ is total pressure at time $t$)

The correct sequence of electron gain enthalpy of the elements listed below is

A. Ar B. Br C. F D. S

Choose the most appropriate from the options given below:

Consider the oxides of group 14 elements

$\mathrm{SiO_2}$, $\mathrm{GeO_2}$, $\mathrm{SnO_2}$, $\mathrm{PbO_2}$, $\mathrm{CO}$ and $\mathrm{GeO}$. The amphoteric oxides are

Identify correct statements from below:

A. The chromate ion is square planar. B. Dichromates are generally prepared from chromates. C. The green manganate ion is diamagnetic. D. Dark green coloured $\mathrm{K_2MnO_4}$ disproportionates in a neutral or acidic medium to give permanganate. E. With increasing oxidation number of transition metal, ionic character of the oxides decreases.

Choose the correct answer from the options given below:

The metals that are employed in the battery industries are

A. Fe B. Mn C. Ni D. Cr E. Cd

Choose the correct answer from the options given below:

The correct statements from following are:

A. The strength of anionic ligands can be explained by crystal field theory. B. Valence bond theory does not give a quantitative interpretation of kinetic stability of coordination compounds. C. The hybridization involved in formation of $\mathrm{[Ni(CN)_4]^{2-}}$ complex is $\mathrm{dsp^2}$. D. The number of possible isomer(s) of cis-$\mathrm{[PtCl_2(en)_2]^{2+}}$ is one

Choose the correct answer from the options given below:

'Adsorption' principle is used for which of the following purification method?

Match List I with List II

	LIST I (Technique)		LIST II (Application)
A.	Distillation	I.	Separation of glycerol from spent-lye
B.	Fractional distillation	II.	Aniline - Water mixture
C.	Steam distillation	III.	Separation of crude oil fractions
D.	Distillation under reduced pressure	IV.	Chloroform - Aniline

Choose the correct answer from the options given below:

Give below are two statements: Statement - I: Noble gases have very high boiling points. Statement - II: Noble gases are monoatomic gases. They are held together by strong dispersion forces. Because of this they are liquefied at very low temperature. Hence, they have very high boiling points. In the light of the above statements, choose the correct answer from the options given below:

A species having carbon with sextet of electrons and can act as electrophile is called

Given below are two statements: Statement I: IUPAC name of $\mathrm{HO-CH_2-(CH_2)_3-CH_2-COCH_3}$ is 7-hydroxyheptan-2-one. Statement II: 2-oxoheptan-7-ol is the correct IUPAC name for above compound. In the light of the above statements, choose the most appropriate answer from the options given below:

The product (C) in the below mentioned reaction is :

$$\mathrm{CH_3-CH_2-CH_2-Br \xrightarrow[\Delta]{KOH_{(alc)}} A \xrightarrow{HBr} B \xrightarrow[KOH_{(aq)}]{\Delta} C}$$

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: Assertion A: $\mathrm{pK_a}$ value of phenol is 10.0 while that of ethanol is 15.9. Reason R: Ethanol is stronger acid than phenol. In the light of the above statements, choose the correct answer from the options given below:

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: Assertion A: Alcohols react both as nucleophiles and electrophiles. Reason R: Alcohols react with active metals such as sodium, potassium and aluminum to yield corresponding alkoxides and liberate hydrogen. In the light of the above statements, choose the correct answer from the options given below:

Match List I with List II

	LIST I		LIST II
A.	Glucose/$\mathrm{NaHCO_3}$/$\Delta$	I.	Gluconic acid
B.	Glucose/$\mathrm{HNO_3}$	II.	No reaction
C.	Glucose/HI/$\Delta$	III.	n-hexane
D.	Glucose/Bromine water	IV.	Saccharic acid

Choose the correct answer from the options given below:

The compound that is white in color is

Number of moles of methane required to produce $22\,\mathrm{g}$ $\mathrm{CO_{2(g)}}$ after combustion is $x \times 10^{-2}$ moles. The value of $x$ is ________.

The ionization energy of sodium in $\mathrm{kJ\,mol^{-1}}$, if electromagnetic radiation of wavelength $242\,\mathrm{nm}$ is just sufficient to ionize sodium atom is _______.

The number of species from the following in which the central atom uses $\mathrm{sp^3}$ hybrid orbitals in its bonding is _______.

$\mathrm{NH_3}$, $\mathrm{SO_2}$, $\mathrm{SiO_2}$, $\mathrm{BeCl_2}$, $\mathrm{CO_2}$, $\mathrm{H_2O}$, $\mathrm{CH_4}$, $\mathrm{BF_3}$

Consider the following reaction at 298 K. $\frac{3}{2}\mathrm{O_{2(g)}} \rightleftharpoons \mathrm{O_{3(g)}}$. $\mathrm{K_P} = 2.47 \times 10^{-29}$. $\Delta_r G^{\ominus}$ for the reaction is ________ kJ. (Given $R = 8.314\,\mathrm{JK^{-1}\,mol^{-1}}$)

One Faraday of electricity liberates $x \times 10^{-1}$ gram atom of copper from copper sulphate. $x$ is ________.

The 'Spin only' Magnetic moment for $\mathrm{[Ni(NH_3)_6]^{2+}}$ is ________ $\times 10^{-1}$ BM. (given = Atomic number of Ni : 28)

Number of alkanes obtained on electrolysis of a mixture of $\mathrm{CH_3COONa}$ and $\mathrm{C_2H_5COONa}$ is ________.

$\mathrm{CH_3CH_2Br + NaOH}$ gives Product A with $\mathrm{C_2H_5OH}$ and Product B with $\mathrm{H_2O}$.

branched reaction scheme — CH3CH2Br + NaOH with C2H5OH giving Product A, and with H2O giving Product B

The total number of hydrogen atoms in product A and product B is ________.

The product of the following reaction is P.

4-hydroxybenzaldehyde (benzene ring with CHO at top and OH at para position) treated with (i) PhMgBr (1 equiv.), (ii) aq. NH4Cl to give P

The number of hydroxyl groups present in the product P is ________.

Molar mass of the salt from $\mathrm{NaBr}$, $\mathrm{NaNO_3}$, $\mathrm{KI}$ and $\mathrm{CaF_2}$ which does not evolve coloured vapours on heating with concentrated $\mathrm{H_2SO_4}$ is ________ $\mathrm{g\,mol^{-1}}$.

(Molar mass in $\mathrm{g\,mol^{-1}}$ : Na : 23, N : 14, K : 39, O : 16, Br : 80, I : 127, F : 19, Ca : 40)