Question

Identify the correct statement for ${\mathrm{B}}_2{\mathrm{H}}_6$ from those given below.

(A) In ${\mathrm{B}}_2{\mathrm{H}}_6$, all $\mathrm{B}-\mathrm{H}$ bonds are equivalent.

(B) In ${\mathrm{B}}_2{\mathrm{H}}_6$, there are four $3$-centre- $2$-electron bonds.

(C) ${\mathrm{B}}_2{\mathrm{H}}_6$ is a Lewis acid.

(D) ${\mathrm{B}}_2{\mathrm{H}}_6$ can be synthesized from both ${\mathrm{BF}}_3$ and ${\mathrm{NaBH}}_4$.

(E) ${\mathrm{B}}_2{\mathrm{H}}_6$ is a planar molecule.

Choose the most appropriate answer from the options given below :

JEE Main 2022 (24 Jun Shift 1)

Options

• A: $\left(\mathrm{A}\right)$ and $\left(\mathrm{E}\right)$ only
• B: $\left(\mathrm{B}\right),\left(\mathrm{C}\right)$ and $\left(\mathrm{E}\right)$ only
• C: $\left(\mathrm{C}\right)$ and $\left(\mathrm{D}\right)$ only
• D: $\left(\mathrm{C}\right)$ and $\left(\mathrm{E}\right)$ only

Question

The Lewis acid character of boron tri halides follows the order:

JEE Main 2023 (31 Jan Shift 2)

Options

• A: ${\mathrm{BCl}}_3>{\mathrm{BF}}_3>{\mathrm{BBr}}_3>{\mathrm{Bl}}_3$
• B: ${\mathrm{Bl}}_3>{\mathrm{BBr}}_3>{\mathrm{BCl}}_3>{\mathrm{BF}}_3$
• C: ${\mathrm{BBr}}_3>{\mathrm{Bl}}_3>{\mathrm{BCl}}_3>{\mathrm{BF}}_3$
• D: ${\mathrm{BF}}_3>{\mathrm{BCl}}_3>{\mathrm{BBr}}_3>{\mathrm{Bl}}_3$

Question

Structures of ${\mathrm{BeCl}}_2$ in solid state, vapour phase and at very high temperature respectively are:

JEE Main 2023 (06 Apr Shift 2)

Options

• A: Monomeric, Dimeric, Polymeric
• B: Dimeric, Polymeric, Monomeric
• C: Polymeric, Monomeric, Dimeric
• D: Polymeric, Dimeric, Monomeric

Question

The correct order of bond enthalpy ($\mathrm{kJ} {\mathrm{mol}}^{–1}$) is:

JEE Main 2023 (01 Feb Shift 2)

Options

• A: $\mathrm{Si}-\mathrm{Si}>\mathrm{C}-\mathrm{C}>\mathrm{Sn}-\mathrm{Sn}>\mathrm{Ge}-\mathrm{Ge}$
• B: $\mathrm{Si}-\mathrm{Si}>\mathrm{C}-\mathrm{C}>\mathrm{Ge}-\mathrm{Ge}>\mathrm{Sn}-\mathrm{Sn}$
• C: $\mathrm{C}-\mathrm{C}>\mathrm{Si}-\mathrm{Si}>\mathrm{Sn}-\mathrm{Sn}>\mathrm{Ge}-\mathrm{Ge}$
• D: $\mathrm{C}-\mathrm{C}>\mathrm{Si}-\mathrm{Si}>\mathrm{Ge}-\mathrm{Ge}>\mathrm{Sn}-\mathrm{Sn}$

Question

Given below are two statements:

Statement I: Boron is extremely hard indicating its high lattice energy.

Statement II: Boron has highest melting and boiling point compared to its other group members.

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

JEE Main 2023 (12 Apr Shift 1)

Options

• A: Both Statement I and Statement II are incorrect
• B: Statement I is correct but Statement II is incorrect
• C: Both statement I and Statement II are correct
• D: Statement I is incorrect but Statement II is correct

Question

The correct statements from the following are : (A) The decreasing order of atomic radii of group 13 elements is \(\mathrm{Tl}>\) In \(>\mathrm{Ga}>\mathrm{Al}>\mathrm{B}\). (B) Down the group 13 electronegativity decreases from top to bottom. (C) \(\mathrm{Al}\) dissolves in dil. \(\mathrm{HCl}\) and liberates \(\mathrm{H}_2\) but conc. \(\mathrm{HNO}_3\) renders \(\mathrm{Al}\) passive by forming a protective oxide layer on the surface. (D) All elements of group 13 exhibits highly stable +1 oxidation state. (E) Hybridisation of \(\mathrm{Al}\) in \(\left[\mathrm{Al}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}\) ion is \(\mathrm{sp}^3 \mathrm{~d}^2\). Choose the correct answer from the options given below :

JEE Main 2024 (05 Apr Shift 2)

Options

• A: (A), (C) and (E) only
• B: (A) and (C) only
• C: (C) and (E) only
• D: (A), (B), (C) and (E) only

Question

The number of ions from the following that are expected to behave as oxidising agent is : \(\mathrm{Sn}^{4+}, \mathrm{Sn}^{2+}, \mathrm{Pb}^{2+}, \mathrm{Tl}^{3+}, \mathrm{Pb}^{4+}, \mathrm{Tl}^{+}\)

JEE Main 2024 (06 Apr Shift 2)

Options

• A: 3
• B: 2
• C: 1
• D: 4

Question

Give below are two statements: One is labelled as Assertion \(\mathrm{A}\) and the other is labelled as Reason R: Assertion A: The stability order of +1 oxidation state of Ga, In and T1 is \(\mathrm{Ga} < \mathrm{In} < \) T1. Reason R: The inert pair effect stabilizes the lower oxidation state down the group. In the light of the above statements, choose the correct answer from the options given below:

JEE Main 2024 (08 Apr Shift 1)

Options

• A: \(\mathrm{A}\) is true but \(\mathrm{R}\) is false.
• B: \(\mathrm{A}\) is false but \(\mathrm{R}\) is true.
• C: Both \(\mathrm{A}\) and \(\mathrm{R}\) are true and \(\mathrm{R}\) is the correct explanation of \(\mathrm{A}\).
• D: Both \(\mathrm{A}\) and \(\mathrm{R}\) are true but \(\mathrm{R}\) is NOT the correct explanation of \(\mathrm{A}\).

Question

Given below are two statements : one is labelled as Assertion $\left(\mathrm{A}\right)$ and the other is labelled as Reason $\left(\mathrm{R}\right)$.
Assertion (A) : Melting point of Boron $(2453 \mathrm{K})$ is unusually high in group $13$ elements.
Reason (R) : Solid Boron has very strong crystalline lattice.
In the light of the above statements, choose the most appropriate answer from the options given below ;

JEE Main 2024 (27 Jan Shift 1)

Options

• A: Both (A) and (R) are correct but (R) Is not the correct explanation of (A)
• B: Both (A) and (R) are correct and (R) is the correct explanation of (A)
• C: (A) is true but (R) is false
• D: (A) is false but (R) is true

Question

Match List - I with List - II.

List - I Compound		List-II Use
(A)	Carbon tetrachloride	(I)	Paint remover
(B)	Methylene chloride	(II)	Refrigerators and air conditioners
(C)	DDT	(III)	Fire extinguisher
(D)	Freons	(IV)	Non Biodegradable insecticide

Choose the correct answer from the options given below:

JEE Main 2024 (01 Feb Shift 2)

Options

• A: $\text{ (A)-(I), (B), (II), (C)-(III), (D)-(IV) }$
• B: $\text{ (A)-(III), (B)-(I), (C)-(IV), (D)-( II) }$
• C: $\text{ (A)-(IV), (B)-(III), (C)-(II), (D)-(I) }$
• D: $\text{ (A)-( II), (B)-(III), (C)-(I), (D)-(IV) }$

Question

Given below are two statements :

Statement I: Group $13$ trivalent halides get easily hydrolysed by water due to their covalent nature.

Statement II: ${\mathrm{AlCl}}_3$ upon hydrolysis in acidified aqueous solution forms octahedral ${\left[\mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}$ ion.

In the light of the above statements, choose the correct answer from the options given below :

JEE Main 2024 (31 Jan Shift 2)

Options

• A: Statement I is true but statement II is false
• B: Statement I is false but statement II is true
• C: Both statement I and statement II are false
• D: Both statement I and statement II are true