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Chemistry

The correct statements from the following are:
A. Ionic radii of trivalent cations of group \( 13 \) elements decreases down the group.
B. Electronegativity of group \( 13 \) elements decreases down the group.
C. Among the group \( 13 \) elements, Boron has highest first ionisation enthalpy.
D. The trichloride and triiodide of group \( 13 \) elements are covalent in nature.
Choose the correct answer from the options given below:

Given below are two statements:
Statement-I: \([\mathrm{CoBr}_{4}]^{2-} \) ion will absorb light of lower energy than \([\mathrm{CoCl}_{4}]^{2-} \) ion.
Statement-II: In \([\mathrm{CoI}_{4}]^{2-} \) ion, the energy separation between the two set of d-orbitals is more than \([\mathrm{CoCl}_{4}]^{2-} \) ion.
In the light of the above statements, choose the correct answer from the options given below:

Given,
(A) $n = 5, m_{\ell} = -1$
(B) $n = 3, \ell = 2, m_{\ell} = -1, m_s = +\frac{1}{2}$
The maximum number of electron(s) in an atom that can have the quantum numbers as given in (A) and (B) respectively are:

Compound ‘P’ undergoes the following sequence of reactions:

Consider the following compounds:

Arrange these compounds in the increasing order of reactivity with nitrating mixture.

Which one of the following graphs accurately represents the plot of partial pressure of $\text{CS}_2$ vs its mole fraction in a mixture of acetone and $\text{CS}_2$ at constant temperature?

Match List-I with List-II.

Choose the correct answer from the options given below:

But-2-yne and hydrogen (one mole each) are separately treated with (i) Pd/C and (ii) Na/liq. \( \mathrm{NH_3} \) to give the products X and Y respectively.

Identify the incorrect statements.
A. X and Y are stereoisomers.
B. Dipole moment of X is zero.
C. Boiling point of X is higher than Y.
D. X and Y react with O₃ / Zn + H₂O to give different products.

A cup of water at \( 5^\circ \text{C} \) (system) is placed in a microwave oven and the oven is turned on for one minute during which the water begins to boil. Which of the following option is true?

Identify the molecule \( (X) \) with maximum number of lone pairs of electrons (obtained using Lewis dot structure) among \( \mathrm{HNO_3} \), \( \mathrm{H_2SO_4} \), \( \mathrm{NF_3} \) and \( \mathrm{O_3} \). Choose the correct bond angle made by the central atom of the molecule \( (X) \).

From the given following (A to D) cyclic structures, those which will not react with Tollen’s reagent are:

\( 'x' \) is the product which is obtained from propanenitrile and stannous chloride in the presence of hydrochloric acid followed by hydrolysis. \( 'y'\) is the product which is obtained from the but-2-ene by the ozonolysis followed by hydrolysis. From the following, which product is not obtained when one mole of \( 'x' \) and one mole of \( 'y' \) react with each other in the presence of alkali followed by heating?

Given below are two statements:
Statement-I: Sublimation is used for the separation and purification of compounds with low melting point.
Statement-II: The boiling point of a liquid increases as the external pressure is reduced.
In the light of the above statements, choose the correct answer from the options given below:

Consider the following sequence of reactions.

Assuming that the reaction proceeds to completion, then \( 137 \, \text{mg} \) of \( 4 \)-nitrotoluene will produce ______ \( \, \text{mg} \) of B.
[Given molar mass in \( \, \text{g mol}^{-1} \): H \( = 1 \), C \( = 12 \), N \( = 14 \), O \( = 16 \) and Br \( = 80 \)]

The statements that are incorrect about the Nickel(II) complex of dimethylglyoxime are:
A. It is red in colour.
B. It has a high solubility in water at \( \mathrm{pH} = 9 \).
C. The Ni ion has two unpaired d-electrons.
D. The N – Ni – N bond angle is almost close to \( 90^\circ \).
E. The complex contains four five-membered metallacycles (metal containing rings).
Choose the correct answer from the options given below:

Which of the following statements regarding the energy of the stationary state is true in the following one-electron systems?

In the given electrochemical cell, \( \mathrm{Ag(s) \, | \, AgCl(s) \, | \, FeCl_2(aq), \, FeCl_3(aq) \, | \, Pt(s)} \) at \( 298 \, \text{K} \), the cell potential (\( E_\text{cell} \)) will increase when:
A. Concentration of \( \mathrm{Fe^{2+}} \) is increased.
B. Concentration of \( \mathrm{Fe^{3+}} \) is decreased.
C. Concentration of \( \mathrm{Fe^{2+}} \) is decreased.
D. Concentration of \( \mathrm{Fe^{3+}} \) is increased.
E. Concentration of \( \mathrm{Cl^-} \) is increased.

Choose the correct answer from the options given below:

The correct trend in the first ionization enthalpies of the elements in the \( 3^\text{rd} \) period of periodic table is:

The correct sequence of reagents for the above conversion of X to Y is:

Consider the general reaction given below at \( 400 \, \text{K} \).
\( xA(g) \rightleftharpoons yB(g) \)
The values of \( K_p \) and \( K_c \) are studied under the same condition of temperature but variation in \( x \) and \( y \).
(i) \( K_p = 85.87 \) and \( K_c = 2.586 \) appropriate units
(ii) \( K_p = 0.862 \) and \( K_c = 28.62 \) appropriate units
The values of \( x \) and \( y \) in (i) and (ii) respectively are:

\( x \) \( \text{mg} \) of pure \( \mathrm{HCl} \) was used to make an aqueous solution. \( 25.0 \, \text{mL} \) of \( 0.1 \, \text{M} \) \( \mathrm{Ba(OH)_2} \) solution is used when the \( \mathrm{HCl} \) solution was titrated against it. The numerical value of \( x \) is _______ \( \times 10^{-1} \). (Nearest integer) [Given: Molar mass of \( \mathrm{HCl} \) and \( \mathrm{Ba(OH)_2} \) are \( 36.5 \) and \( 171.0 \, \text{g mol}^{-1} \) respectively]

For the following gas phase equilibrium reaction at constant temperature, \( \mathrm{NH_3(g)} \rightleftharpoons \dfrac{1}{2}\mathrm{N_2(g)} + \dfrac{3}{2}\mathrm{H_2(g)} \) if the total pressure is \( \sqrt{3} \, \text{atm} \) and the pressure equilibrium constant \( (K_p) \) is \( 9 \, \text{atm} \), then the degree of dissociation is given as \( (x \times 10^{-2})^{1/2} \). The value of \( x \) is _______. (Nearest integer)

For the thermal decomposition of reactant \( \mathrm{AB(g)} \), the following plot is constructed.

The half-life of the reaction is ‘\( x \)’ \( \text{min} \). \( x = \) min ________. (Nearest integer)

Consider all the structural isomers with molecular formula \( \mathrm{C_5H_{11}Br} \) are separately treated with \( \mathrm{KOH(aq)} \) to give respective substitution products, without any rearrangement. The number of products which can exhibit optical isomerism from these is ________.

The crystal field splitting energy of \( [Co(oxalate)_3]^{3-} \) complex is \( n \) times that of the \( [Cr(oxalate)_3]^{3-} \) complex. Here \( n \) is ______. [Assume \( \Delta_o \gg P \)]

JEE Main 2026 23rd Jan Morning Shift

Mathematics Physics Chemistry

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From the given following (A to D) cyclic structures, those which will not react with Tollen’s reagent are: