JEE Main 2024 Jan 30 Shift 2 — Chemistry

If a substance 'A' dissolves in solution of a mixture of 'B' and 'C' with their respective number of moles as $\mathrm{n_A}$, $\mathrm{n_B}$ and $\mathrm{n_C}$, Mole fraction of C in the solution is :

Given below are two statements:

Statement - I: Since Fluorine is more electronegative than nitrogen, the net dipole moment of $\mathrm{NF_3}$ is greater than $\mathrm{NH_3}$.

Statement - II: In $\mathrm{NH_3}$, the orbital dipole due to lone pair and the dipole moment of NH bonds are in opposite direction, but in $\mathrm{NF_3}$ the orbital dipole due to lone pair and dipole moments of N-F bonds are in same direction.

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

The molecule / ion with square pyramidal shape is

The solution from the following with highest depression in freezing point/lowest freezing point is

Reduction potential of ions are given below:

$\mathrm{ClO_4^-}$	$\mathrm{IO_4^-}$	$\mathrm{BrO_4^-}$
$\mathrm{E^\circ = 1.19\ V}$	$\mathrm{E^\circ = 1.65\ V}$	$\mathrm{E^\circ = 1.74\ V}$

The correct order of their oxidising power is :

Given below are two statements:

Statement - I: Along the period, the chemical reactivity of the elements gradually increases from group 1 to group 18.

Statement - II: The nature of oxides formed by group 1 elements is basic while that of group 17 elements is acidic.

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

Choose the correct statements about the hydrides of group 15 elements.

A. The stability of the hydrides decreases in the order $\mathrm{NH_3} > \mathrm{PH_3} > \mathrm{AsH_3} > \mathrm{SbH_3} > \mathrm{BiH_3}$.

B. The reducing ability of the hydride increases in the order $\mathrm{NH_3} < \mathrm{PH_3} < \mathrm{AsH_3} < \mathrm{SbH_3} < \mathrm{BiH_3}$.

C. Among the hydrides, $\mathrm{NH_3}$ is strong reducing agent while $\mathrm{BiH_3}$ is mild reducing agent.

D. The basicity of the hydrides increases in the order $\mathrm{NH_3} < \mathrm{PH_3} < \mathrm{AsH_3} < \mathrm{SbH_3} < \mathrm{BiH_3}$.

Choose the most appropriate 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: $\mathrm{H_2Te}$ is more acidic than $\mathrm{H_2S}$.

Reason R: Bond dissociation enthalpy of $\mathrm{H_2Te}$ is lower than $\mathrm{H_2S}$.

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

Alkaline oxidative fusion of $\mathrm{MnO_2}$ gives "A" which on electrolytic oxidation in alkaline solution produces B. A and B respectively are

The orange colour of $\mathrm{K_2Cr_2O_7}$ and purple colour of $\mathrm{KMnO_4}$ is due to

The coordination geometry around the manganese in decacarbonyldimanganese (0) is

Which among the following purification methods is based on the principle of "Solubility" in two different solvents?

The correct stability order of carbocations is

IUPAC name of following compound is :

$$\mathrm{CH_3 - \underset{\underset{NH_2}{|}}{CH} - CH_2 - CN}$$

Given below are two statements:

Statement - I: High concentration of strong nucleophilic reagent with secondary alkyl halides which do not have bulky substituents will follow $\mathrm{S_N^2}$ mechanism.

Statement - II: A secondary alkyl halide when treated with a large excess of ethanol follows $\mathrm{S_N^1}$ mechanism.

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

Salicylaldehyde is synthesized from phenol, when reacted with

Products A and B formed in the following set of reactions are

reaction scheme — 1-methylcyclohexene at the centre; arrow to the right labelled $\mathrm{H^+/H_2O}$ gives A; arrow to the left labelled $\mathrm{B_2H_6}$ (above) and $\mathrm{H_2O_2}$, NaOH(aq) (below) gives B

m-chlorobenzaldehyde on treatment with 50% KOH solution yields

The products A and B formed in the following reaction scheme are respectively

benzene $\xrightarrow[\text{ii) Sn / HCl}

{\text{i) con. } \mathrm{HNO_3}/\text{Con. } \mathrm{H_2SO_4},\ 323-333\ \mathrm{K}}$A$\xrightarrow[\text{ii) Phenol}]{\text{i) } \mathrm{NaNO_2},\ \mathrm{HCl},\ 273-278\ \mathrm{K}}$ B]*

A and B formed in the following reactions are:

$$\mathrm{CrO_2Cl_2 + 4NaOH \rightarrow A + 2NaCl + 2H_2O}$$ $$\mathrm{A + 2HCl + 2H_2O_2 \rightarrow B + 3H_2O}$$

Number of spectral lines obtained in $\mathrm{He^+}$ spectra, when an electron makes transition from fifth excited state to first excited state will be

Two reactions are given below:

$$\mathrm{2Fe_{(s)} + \tfrac{3}{2}O_{2(g)} \rightarrow Fe_2O_{3(s)}},\quad \Delta \mathrm{H^\circ = -822\ kJ/mol}$$ $$\mathrm{C_{(s)} + \tfrac{1}{2}O_{2(g)} \rightarrow CO_{(g)}},\quad \Delta \mathrm{H^\circ = -110\ kJ/mol}$$

Then enthalpy change for following reaction $\mathrm{3C_{(s)} + Fe_2O_{3(s)} \rightarrow 2Fe_{(s)} + 3CO_{(g)}}$ is _________ kJ/mol.

The pH of an aqueous solution containing 1M benzoic acid ($\mathrm{pK_a} = 4.20$) and 1M sodium benzoate is 4.5. The volume of benzoic acid solution in 300 mL of this buffer solution is _________ mL. (given : $\log 2 = 0.3$)

Total number of species from the following which can undergo disproportionation reaction is ________.

$$\mathrm{H_2O_2,\ ClO_3^-,\ P_4,\ Cl_2,\ Ag,\ Cu^{+1},\ F_2,\ NO_2,\ K^+}$$

$\mathrm{NO_2}$ required for a reaction is produced by decomposition of $\mathrm{N_2O_5}$ in $\mathrm{CCl_4}$ as by equation

$$\mathrm{2N_2O_{5(g)} \rightarrow 4NO_{2(g)} + O_{2(g)}}$$

The initial concetration. of $\mathrm{N_2O_5}$ is 3 mol L$^{-1}$ and it is 2.75 mol L$^{-1}$ after 30 minutes.

The rate of formation of $\mathrm{NO_2}$ is $\mathrm{x \times 10^{-3}}$ mol L$^{-1}$ min$^{-1}$, value of x is _______. (nearest integer)

Number of complexes which show optical isomerism among the following is _________.

$\mathrm{cis-[Cr(ox)_2Cl_2]^{3-}}$, $\mathrm{[Co(en)_3]^{3+}}$, $\mathrm{cis-[Pt(en)_2Cl_2]^{2+}}$, $\mathrm{cis-[Co(en)_2Cl_2]^+}$, $\mathrm{trans-[Pt(en)_2Cl_2]^{2+}}$, $\mathrm{trans-[Cr(ox)_2Cl_2]^{3-}}$

Number. of geometrical isomers possible for the given structure is/are _________.

an open-chain triene skeleton drawn with three carbon-carbon double bonds; the two terminal alkene carbons each bear one H and one D, and a central carbon of the chain carries a methyl branch as well as an exocyclic C=C to a CH(D)(CH3)-type terminus

$$\text{2-chlorobutane} + \mathrm{Cl_2} \rightarrow \mathrm{C_4H_8Cl_2}\ \text{(isomers)}$$

Total number of optically active isomers shown by $\mathrm{C_4H_8Cl_2}$, obtained in the above reaction is ________.

The total number of correct statements, regarding the nucleic acids is ______

A. RNA is regarded as the reserve of genetic information

B. DNA molecule self-duplicates during cell division

C. DNA synthesizes proteins in the cell

D. The message for the synthesis of particular proteins is present in DNA

E. Identical DNA strands are transferred to daughter cells.

Number of metal ions characterized by flame test among the following is ______.

$$\mathrm{Sr^{2+},\ Ba^{2+},\ Ca^{2+},\ Cu^{2+},\ Zn^{2+},\ Co^{2+},\ Fe^{2+}}$$