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Chemistry

In which pairs, the first ion is more stable than the second?

Consider the ground state of chromium atom (\( Z = 24 \)). How many electrons are with Azimuthal quantum number \( l = 1 \) and \( l = 2 \) respectively?

53.

Match List - I with List – II

List – I (Separation of)		List – II (Separation Technique)
(A) Aniline from aniline-water mixture		(I) Simple distillation
(B) Glycerol from spent-lye in soap industry		(II) Fractional distillation
(C) Different fractions of crude oil in petroleum industry		(III) Distillation at reduced pressure
(D) Chloroform-Aniline mixture		(IV) Steam distillation

Choose the correct answer from the options given below:

54.

A dipeptide, "x" on complete hydrolysis gives "y" and "z". "y" on treatment with aq. \( \mathrm{HNO_2} \) produces lactic acid. On the other hand "z" on heating gives the following cyclic molecule.

Based on the information given, the dipeptide X is:

55.

Consider the following plots of log of rate constant \( k \) \( (\log k) \) vs \( \frac{1}{T} \) for three different reactions.
The correct order of activation energies of these reactions is:

56.

The correct order of basicity for the following molecules is:

57.

The correct order of \( [\mathrm{FeF_6}]^{3-} \), \( [\mathrm{CoF_6}]^{3-} \), \( [\mathrm{Ni(CO)_4} ]\) and \( [\mathrm{Ni(CN)_4}]^{2-} \) complex species based on the number of unpaired electrons present is:

58.

Given below are two statements:
Statement (I): Alcohols are formed when alkyl chlorides are treated with aqueous potassium hydroxide by elimination reaction.
Statement (II): In alcoholic potassium hydroxide, alkyl chlorides form alkenes by abstracting the hydrogen from the \( \beta \)-carbon.
In the light of the above statements, choose the most appropriate answer from the options given below:

59.

The incorrect relationship in the following pairs in relation to ionization enthalpies is:

60.

Given below are two statements:
Statement (I): Molal depression constant \( K_f \) is given by \( \frac{M_1 R T_f}{\Delta S_{fus}} \), where symbols have their usual meaning.
Statement (II): \( K_f \) for benzene is less than the \( K_f \) for water.
In the light of the above statements, choose the most appropriate answer from the options given below:

61.

Given below are two statements:
Statement (I): The first ionisation enthalpy of group \( 14 \) elements is higher than the corresponding elements of group \( 13 \).
Statement (II): Melting points and boiling points of group \( 13 \) elements are in general much higher than those of corresponding elements of group \( 14 \).
In the light of the above statements, choose the most appropriate answer from the options given below:

62.

Half life of zero order reaction \( A \rightarrow \) product is \( 1 \) hour, when initial concentration of reactant is \( 2.0 \, mol \, L^{-1} \). The time required to decrease concentration of \( A \) from \( 0.50 \) to \( 0.25 \, mol \, L^{-1} \) is:

63.

‘\( X \)’ is the number of electrons in \( t_{2g} \) orbitals of the most stable complex ion among \( [Fe(NH_3)_6]^{3+} \), \( [Fe(Cl)_6]^{3-} \), \( [Fe(C_2O_4)_3]^{3-} \) and \( [Fe(H_2O)_6]^{3+} \). The nature of oxide of vanadium of the type \( V_2O_X \) is:

64.

Given below are two statements:

Statement (I): For \(\displaystyle \underset{\bullet \bullet}{\overset{\bullet \bullet}{\text{C}}}\text{IF}_3\) all three possible structures may be drawn as follows.

Statement (II): Structure \( \text{III} \) is most stable, as the orbitals having the lone pairs are axial, where the lp-bp repulsion is minimum.
In the light of the above statements, choose the most appropriate answer from the options given below:

65.

Consider the given data:
(a) \( \mathrm{HCl(g)} + 10 \, \mathrm{H_2O(l)} \rightarrow \mathrm{HCl} \cdot 10 \, \mathrm{H_2O} \, ; \, \Delta H = -69.01 \, \mathrm{kJ} \, mol^{-1} \)
(b) \( \mathrm{HCl(g)} + 40 \, \mathrm{H_2O(l)} \rightarrow \mathrm{HCl} \cdot 40 \, \mathrm{H_2O} \, ; \, \Delta H = -72.79 \, \mathrm{kJ} \, mol^{-1} \)
Choose the correct statement:

66.

Consider the following molecule \( (X) \).

The major product formed when the given molecule \( (X) \) is treated with \( \mathrm{HBr} \) \( (1 \,\text{eq}) \) is:

67.

The IUPAC name of the following compound is :

68.

Which among the following compounds give yellow solid when reacted with \( \mathrm{NaOI}/\mathrm{NaOH} \)?

Choose the correct from the options given below:

69.

A toxic compound ‘A’ when reacted with \( \mathrm{NaCN} \) in aqueous acidic medium yields an edible cooking component and food preservative ‘'B’'. '‘B’' is converted to '‘C’' by diborane and can be used as an additive to petrol to reduce emission. ‘'C’' upon reaction with oleum at \( 140^\circ \mathrm{C} \) yields an inhalable anesthetic '‘D’'. Identify ‘'A'’, '‘B’', '‘C'’ & '‘D’', respectively:

70.

The elements of Group \( 13 \) with highest and lowest first ionisation enthalpies are respectively:

71.

The molar conductance of an infinitely dilute solution of ammonium chloride was found to be \( 185 \, \mathrm{S \, cm^2 \, mol^{-1}} \) and the ionic conductance of hydroxyl and chloride ions are \( 170 \) and \( 70 \, \mathrm{S \, cm^2 \, mol^{-1}} \), respectively. If molar conductance of \( 0.02 \, \mathrm{M} \) solution of ammonium hydroxide is \( 85.5 \, \mathrm{S \, cm^2 \, mol^{-1}} \), its degree of dissociation is given by \( x \times 10^{-1} \). The value of \( x \) is __________. (Nearest integer)

72.

Sea water, which can be considered as a \( 6 \) molar \( (6 \, \text{M}) \) solution of \( \text{NaCl} \), has a density of \( 2 \, \text{g m L}^{-1} \).The concentration of dissolved oxygen \( (\text{O}_2) \) in sea water is \( 5.8 \) ppm. Then the concentration of dissolved oxygen \( (\text{O}_2) \) in sea water, is \( x \times 10^{-4} \, m \).
\( x = \) (Nearest integer)
Given: Molar mass of \( \text{NaCl} \) is \( 58.5 \, \text{g mol}^{-1} \)
Molar mass of \( \text{O}_2 \) is \( 32 \, \text{g mol}^{-1} \)

73.

A metal complex with a formula \( MCl_4.3NH_3 \) is involved in \( \text{sp}^3 d^2 \) hybridisation. It upon reaction with excess of \( \text{AgNO}_3 \) solution gives ‘\( x \)’ moles of \( \text{AgCl} \). Consider ‘\( x \)’ is equal to the number of lone pairs of electron present in central atom of \( \text{BrF}5 \). Then the number of geometrical isomers exhibited by the complex is ________.

74.

\( x \) mg of \( \text{Mg(OH)}_2 \) (molar mass \( = 58 \)) is required to be dissolved in \( 1.0 \, \text{L} \) of water to produce a pH of \( 10.0 \) at \( 298 \, \text{K} \). The value of \( x \) is ________ mg. (Nearest integer)
(Given: \( \text{Mg(OH)}_2 \) is assumed to dissociate completely in \( \text{H}_2\text{O} \) )

75.

The amount of calcium oxide produced on heating \( 150 \, \text{kg} \) limestone \( (75\% \) pure\() \) is ________ \( \text{kg} \). (Nearest integer)
Given: Molar mass (in \( \text{g mol}^{-1} \)) of \( \text{Ca-40} \), \( \text{O-16} \), \( \text{C-12} \).

JEE Main 2025 4th April Evening Shift

Mathematics Physics Chemistry

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