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Chemistry

The correct molecular orbital diagram for \( \mathrm{F_2} \) molecule in the ground state is:

Consider the following statements related to colloids.
(I) Lyophobic colloids are not formed by simple mixing of dispersed phase and dispersion medium.
(II) For emulsions, both the dispersed phase and the dispersion medium are liquid.
(III) Micelles are produced by dissolving a surfactant in any solvent at any temperature.
(IV) Tyndall effect can be observed from a colloidal solution with dispersed phase having the same refractive index as that of the dispersion medium.
The option with correct set of statement is:

20.

In the following reactions, P, Q, R and S are the manor products.

The correct statement about P, Q, R and S is:

21.

A disaccharide X cannot be oxidised by bromine water. The acid hydrolysis of X leads to a laevorotatory solution. The disaccharide X is:

22.

The complex(es), which can exhibit the type of isomerism show by \( \left[ \mathrm{Pt}\left(\mathrm{NH_3}\right)_2 \mathrm{Br_2} \right] \), is (are) \([ \mathrm{en} = \mathrm{H_2NCH_2CH_2NH_2} ]\):

23.

Atoms of metal \( x \), \( y \) and \( z \) from face-centred cubic (fcc) unit cell of edge length \( L_x \), body-centred cubic (bcc) unit cell of edge length \( L_y \) and simple cubic unit cell of edge length \( L_z \), respectively.
If \( r_z = \frac{\sqrt{3}}{2} r_y \); \( r_y = \frac{8}{\sqrt{3}} r_x \); \( M_z = \frac{3}{2} M_y \) and \( M_z = 3 M_x \), then the correct statement(s) is (are)
[Given: \( M_x \), \( M_y \) and \( M_z \) are molar masses of metals \( x \), \( y \) and \( z \) respectively]

24.

In the following reactions, P, Q, R and S are the major products.

The correct statement(s) about P, Q, R and S is(are):

25.

\( \mathrm{H_2S} \) \( (\,5\, \text{moles}\,) \) reacts completely with acidified aqueous potassium permanganate solution. In this reaction, the number of moles of water produced is \( x \), and the number of moles of electrons involved is \( y \). The value of \( (x + y) \) is \( \_\_\_\_\_\_\_\_ \).

26.

Among \( [\mathrm{I_3}]^{+} \), \( [\mathrm{SiO_4}]^{4-} \), \( \mathrm{SO_2Cl_2} \), \( \mathrm{XeF_2} \), \( \mathrm{SF_4} \), \( \mathrm{ClF_3} \), \( \mathrm{Ni(CO)_4} \), \( \mathrm{XeO_2F_2} \), \( [\mathrm{PtCl_4}]^{2-} \), \( \mathrm{XeF_4} \) and \( \mathrm{SOCl_2} \), the total number of species having \( sp^3 \) hybridised central atom is \( \_\_\_\_\_\_\_ \).

27.

Consider the following molecules: \( \mathrm{Br_3O_8} \), \( \mathrm{F_2O} \), \( \mathrm{H_2S_4O_6} \), \( \mathrm{H_2S_5O_6} \) and \( \mathrm{C_3O_2} \). Count the number of atoms existing in their zero oxidation state in each molecule. Their sum is \( \_\_\_\_\_ \).

28.

For \( \mathrm{He^+} \), a transition takes place from the orbit of radius \( 105.8 \, \mathrm{pm} \) to the orbit of radius \( 26.45 \, \mathrm{pm} \). The wavelength (in \( \mathrm{nm} \)) of the emitted photon during the transition is \( \_\_\_\_\_ \).
[Use: Bohr radius, \( a = 52.9 \, \mathrm{pm} \);
Rydberg constant, \( R_H = 2.2 \times 10^{-18} \, \mathrm{J} \);
Planck’s constant, \( h = 6.6 \times 10^{-34} \, \mathrm{J\,s} \);
Speed of light, \( c = 3 \times 10^{8} \, \mathrm{m\,s^{-1}} \)]

29.

\( 50 \, \text{mL} \) of \( 0.2 \) molal urea solution (density \( = 1.012 \, \text{g mL}^{-1} \) at \( 300 \, \text{K} \)) is mixed with \( 250 \, \text{mL} \) of a solution containing \( 0.06 \, \text{g} \) of urea. Both the solutions were prepared in the same solvent. The osmotic pressure (in Torr) of the resulting solution at \( 300 \, \text{K} \) is ________.
[Use : Molar mass of urea \( = 60 \, \text{g mol}^{-1} \); gas constant, \( R = 62 \, \text{L Torr K}^{-1} \text{ mol}^{-1} \); Assume \( \Delta_{\text{mix}} H = 0 \), \( \Delta_{\text{mix}} V = 0 \)]

30.

The reaction of \( 4 \)-methyloct-\( 1 \)-ene (\( P, 2.52 \, \text{g} \)) with \( \mathrm{HBr} \) in the presence of \( (\mathrm{C}_6\mathrm{H}_5\mathrm{CO})_2\mathrm{O}_2 \) gives two isomeric bromides in a \( 9:1 \) ratio, with a combined yield of \( 50\% \). Of these, the entire amount of the primary alkyl bromide was reacted with an appropriate amount of diethylamine followed by treatment with aq. \( \mathrm{K}_2\mathrm{CO}_3 \) to give a non-ionic product \( S \) in \( 100\% \) yield.
The mass (in \( \text{mg} \)) of \( S \) obtained is ________.
[Use: molar mass (in \( \text{g mol}^{-1} \)): \( \mathrm{H} = 1 \), \( \mathrm{C} = 12 \), \( \mathrm{N} = 14 \), \( \mathrm{Br} = 80 \) ]

31.

Paragraphs-1
The entropy versus temperature plot for phase \( \alpha \) and \( \beta \) at \( 1 \) bar pressure is given. \( S_T \) and \( S_0 \) are entropies of the phases at temperature \( T \) and \( 0 \, \text{K} \), respectively.

The transition temperature for \( \alpha \) to \( \beta \) phase change is \( 600 \, \text{K} \) and \( C_{p,\beta} - C_{p,\alpha} = 1 \, \text{J mol}^{-1} \text{ K}^{-1} \). Assume \( (C_{p,\beta}-C_{p,\alpha}) \) is independent of temperature in the range of \( 200 \) to \( 700 \, \text{K} \). \( C_{p,\alpha} \) and \( C_{p,\beta} \) are heat capacities of \( \alpha \) and \( \beta \) phases, respectively.
The value of entropy change, \( S_{\beta} - S_{\alpha} \) (in \( \text{J mol}^{-1} \text{ K}^{-1} \)), at \( 300 \, \text{K} \) is ____________.
[Use : \( \ln 2 = 0.69 \) ;
Given : \( S_{\beta} - S_{\alpha} = 0 \) at \( 0 \, \text{K} \) ]

32.

Paragraphs-1
The entropy versus temperature plot for phase \( \alpha \) and \( \beta \) at \( 1 \) bar pressure is given. \( S_T \) and \( S_0 \) are entropies of the phases at temperature \( T \) and \( 0 \, \text{K} \), respectively.

The transition temperature for \( \alpha \) to \( \beta \) phase change is \( 600 \, \text{K} \) and \( C_{p,\beta} - C_{p,\alpha} = 1 \, \text{J mol}^{-1} \text{ K}^{-1} \).Assume \( (C_{p,\beta}-C_{p,\alpha}) \) is independent of temperature in the range of \( 200 \) to \( 700 \, \text{K} \). \( C_{p,\alpha} \) and \( C_{p,\beta} \) are heat capacities of \( \alpha \) and \( \beta \) phases, respectively.
The value of enthalpy change, \( H_{\beta} - H_{\alpha} \) (in \( \text{J mol}^{-1} \)), at \( 300 \, \text{K} \) is ____________.

33.

Paragraphs-2
A trinitro compound, \( 1,3,5 \)-tris-(\( 4 \)-nitrophenyl) benzene, on complete reaction with an excess of \( \mathrm{Sn/HCl} \) gives a major product, which on treatment with an excess of \( \mathrm{NaNO_2/HCl} \) at \( 0^\circ \text{C} \) provides \( P \) as the product. \( P \), upon treatment with excess of \( \mathrm{H_2O} \) at room temperature, gives the product \( Q \). Bromination of \( Q \) in aqueous medium furnishes the product \( R \). The compound \( P \) upon treatment with an excess of phenol under basic conditions gives the product \( S \).
The molar mass difference between compounds \( Q \) and \( R \) is \( 474 \, \text{g mol}^{-1} \) and between compounds \( P \) and \( S \) is \( 172.5 \, \text{g mol}^{-1} \).
The number of heteroatoms present in one molecule of \( R \) is ___________.
[Use : Molar mass (in \( \text{g mol}^{-1} \)): \( \mathrm{H} = 1 \), \( \mathrm{C} = 12 \), \( \mathrm{N} = 14 \), \( \mathrm{O} = 16 \), \( \mathrm{Br} = 80 \), \( \mathrm{Cl} = 35.5 \) ; Atoms other than \( \mathrm{C} \) and \( \mathrm{H} \) are considered as heteroatoms]

34.

Paragraphs-2
A trinitro compound, \( 1,3,5 \)-tris-\( (4\text{-nitrophenyl}) \) benzene, on complete reaction with an excess of \( \text{Sn/HCl} \) gives a major product, which on treatment with an excess of \( \text{NaNO}_2 / \text{HCl} \) at \( 0^\circ \text{C} \) provides \( P \) as the product. \( P \), upon treatment with excess of \( \text{H}_2\text{O} \) at room temperature, gives the product \( Q \). Bromination of \( Q \) in aqueous medium furnishes the product \( R \). The compound \( P \) upon treatment with an excess of phenol under basic conditions gives the product \( S \).
The molar mass difference between compounds \( Q \) and \( R \) is \( 474 \, \text{g mol}^{-1} \) and between compounds \( P \) and \( S \) is \( 172.5 \, \text{g mol}^{-1} \).
The total number of carbon atoms and heteroatoms present in one molecule of \( S \) is ______.
[Use: Molar mass \( (\text{in } \text{g mol}^{-1}) \): \( \text{H} = 1 \), \( \text{C} = 12 \), \( \text{N} = 14 \), \( \text{O} = 16 \), \( \text{Br} = 80 \), \( \text{Cl} = 35.5 \) Atoms other than \( \text{C} \) and \( \text{H} \) are considered as heteroatoms]

JEE Advanced 2023 Paper - 2

Physics Chemistry Mathematics

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The correct molecular orbital diagram for \( \mathrm{F_2} \) molecule in the ground state is:

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