Group 13 Elements

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JEE Advanced 2022

The compound(s) which react(s) with $NH_{3}$ to give boron nitride (BN) is(are)

B_{2} H_{6}

(C)

B_{2} O_{3}

(D)

HBF_{4}

JEE Advanced 2016

LEVELJEE Main

The crystalline form of borax has

* Multiple Correct Options

(A)

Tetranuclear

[B_{4} O_{5} (O H)_{4}]^{2 -}

unit

(B)

All boron atoms in the same plane

(C)

Equal number of

s p^{2}

and

s p^{3}

hybridized boron atoms

(D)

One terminal hydroxide per boron atom

JEE Advanced 2017

LEVELJEE Main

Among the following, the correct statement(s) is are

* Multiple Correct Options

(A)

Al (CH_{3})_{3}

has the three-centre two-electron bonds in its dimeric structure

(B)

AlCl_{3}

has the three-centre two-electron bonds in its dimeric structure

(C)

BH_{3}

has the three-centre two-electron bonds in its dimeric structure

(D)

The Lewis acidity of

BCl_{3}

is greater than that of

AlCl_{3}

JEE Advanced 2015

LEVELJEE Main

Three moles of $B_{2} H_{6}$ are completely reacted with methanol. The number of moles of boron containing product formed is –

JEE Advanced 2014

LEVELJEE Advanced

The correct statements(s) for orthoboric acid is/are-

* Multiple Correct Options

(A)

It behaves as a weak acid in water due to self ionization

(B)

Acidity of its aqueous solution increses upon addition of ethylene glycol

(C)

It has a three dimensional structure due to hydrogen bonding.

(D)

It is a weak electrolyte in water

JEE Main 2020

LEVELJEE Advanced

The reaction of $H_{3} N_{3} B_{3} C l_{3}$ (A) with $L i B H_{4}$ in tetrahydrofuran gives inorganic benzene (B). Further, the reaction of (A) with (C) leads to $H_{3} N_{3} B_{3} (M e)_{3}$ . Compounds (B) and (C) respectively, are

(A)

diborane and MeMgBr

(B)

boron nitride and MeBr

The correct statement about $B_{2} H_{6}$ is

(A)

all

B—H—B

angles are of

12 0^{\circ}

(B)

the two

B—H—B

bonds are not of same length

(C)

terminal

B—H

bonds have less p-character when compared to bridging bonds

(D)

Its fragment,

BH_{3}

, behaves as a Lewis base

LEVELJEE Main

The structure of diborane ( $B_{2} H_{6}$ ) contains

(A)

four

2 c - 2 e^{-}

bonds and four

3 c - 2 e^{-}

bonds

(B)

two

2 c - 2 e^{-}

bonds and two

3 c - 3 e^{-}

bonds

(C)

two

2 c - 2 e^{-}

bonds and four

3 c - 2 e^{-}

bonds

(D)

four

2 c - 2 e^{-}

bonds and two

3 c - 2 e^{-}

bonds

JEE Main 2021

LEVELJEE Main

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) In $TlI_{3}$ , isomorphous to $CsI_{3}$ , the metal is present in $+ 1$ oxidation state. Reason (R) Tl metal has fourteen f-electrons in the electronic configuration. In the light of the above statements, choose the most appropriate answer from the options given below.

(A)

A is correct but R is not correct.

(B)

Both A and R are correct and R is the correct explanation of A.

(C)

A is not correct but R is correct.

(D)

Both A and R are correct but R is not correct explanation of A.

LEVELJEE Main

Boron can't form which one of the following anions?

(A)

B F_{6}^{3 -}

(B)

B H_{4}^{-}

(C)

B (O H)_{4}^{-}

(D)

B O_{2}^{-}

JEE Main 2009

LEVELJEE Main

The bond dissociation energy of B—F in $BF_{3}$ is $646 kJ mol^{- 1}$ whereas that of C—F in $CF_{4}$ is $515 kJ mol^{- 1}$ . The correct reason for higher B—F bond dissociation energy as compared to that of C—F is

(A)

smaller size of B-atom as compared to that of C-atom

(B)

stronger

σ

-bond between B and F in

BF_{3}

as compared to that between C and F in

CF_{4}

(C)

significant

p π - p π

interaction between B and F in

BF_{3}

whereas there is no possibility of such interaction between C and F in

CF_{4}

(D)

lower degree of

p π - p π

interaction between B and F in

BF_{3}

than that between C and F in

CF_{4}

LEVELJEE Main

Which one of the following is the correct statement ?

(A)

Boric acid is a protonic acid

(B)

Beryllium exhibits coordination number of six

(C)

Chlorides of both beryllium and aluminium have bridged chloride structures in solid phase

(D)

B_{2} H_{6} \cdot 2 NH_{3}

is known as 'inorganic benzene'

LEVELJEE Main

Beryllium and aluminium exhibit many properties which are similar. But the two elements differ in

(A)

exhibiting maximum covalency in compounds

(B)

forming polymeric hydrides

(C)

forming covalent halides

(D)

exhibiting amphoteric nature in their oxides

JEE Main 2019

LEVELJEE Main

The electronegativity of aluminium is similar to

Aluminium chloride exists as dimer, $Al_{2} Cl_{6}$ in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives

(A)

Al^{3 +} + 3 Cl^{-}

(B)

[Al (H_{2} O)_{6}]^{3 +} + 3 Cl^{-}

(C)

[Al (OH)_{6}]^{3 -} + 3 HCl

(D)

Al_{2} O_{3} + 6 HCl

JEE Main 2019

LEVELJEE Main

The number of 2-centre-2-electron and 3-centre-2-electron bonds in $B_{2} H_{6}$ , respectively, are

The correct statements among I to III regarding group 13 element oxides are: I. Boron trioxide is acidic. II. Oxides of aluminium and gallium are amphoteric. III. Oxides of indium and thallium are basic.

The relative stability of $+ 1$ oxidation state of group 13 elements follows the order

(A)

Al < Ga < Tl < In

(B)

Al < Ga < In < Tl

(C)

Tl < In < Ga < Al

(D)

Ga < Al < In < Tl

JEE Main 2018

LEVELJEE Main

When metal 'M' is treated with NaOH, a white gelatinous precipitate 'X' is obtained, which is soluble in excess of NaOH. Compound 'X' when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal 'M' is

Given below are the statements about diborane. (A) Diborane is prepared by the oxidation of $NaBH_{4}$ and $I_{2}$ . (B) Each boron atom is in $sp^{2}$ -hybridised state. (C) Diborane has one bridged 3 centre -2 - electron bond. (D) Diborane is a planar molecule. The option with correct statement(s) is

In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?

(A)

BCl_{3}

(B)

BF_{3}

(C)

BBr_{3}

(D)

BI_{3}

LEVELJEE Main

The type of hybridisation of boron in diborane is

(A)

s p

hybridisation

(B)

s p^{2}

hybridisation

(C)

s p^{3}

hybridisation

(D)

s p^{3} d^{2}

hybridisation

JEE Main 2019

LEVELJEE Main

Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in +1 and +3 oxidation states. This is due to

(A)

lattice effect

(B)

lanthanoid contraction

(C)

inert pair effect

(D)

diagonal relationship

LEVELJEE Main

Heating of an aqueous solution of aluminium chloride to dryness will give

(A)

Al(OH)Cl_{2}

(B)

Al_{2} O_{3}

(C)

Al_{2} Cl_{6}

(D)

AlCl_{3}

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The compound(s) which react(s) with NH3​ to give boron nitride (BN) is(are)

The crystalline form of borax has

Among the following, the correct statement(s) is are

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Three moles of B2​H6​ are completely reacted with methanol. The number of moles of boron containing product formed is –

The correct statements(s) for orthoboric acid is/are-

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The correct statement about B2​H6​ is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The structure of diborane (B2​H6​) contains

Boron can't form which one of the following anions?

Which one of the following is the correct statement ?

Beryllium and aluminium exhibit many properties which are similar. But the two elements differ in

The electronegativity of aluminium is similar to

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Aluminium chloride exists as dimer, Al2​Cl6​ in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The number of 2-centre-2-electron and 3-centre-2-electron bonds in B2​H6​, respectively, are

The correct statements among I to III regarding group 13 element oxides are: I. Boron trioxide is acidic. II. Oxides of aluminium and gallium are amphoteric. III. Oxides of indium and thallium are basic.

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The relative stability of +1 oxidation state of group 13 elements follows the order

When metal 'M' is treated with NaOH, a white gelatinous precipitate 'X' is obtained, which is soluble in excess of NaOH. Compound 'X' when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal 'M' is

In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?

The type of hybridisation of boron in diborane is

Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in +1 and +3 oxidation states. This is due to

Heating of an aqueous solution of aluminium chloride to dryness will give

The compound(s) which react(s) with $NH_{3}$ to give boron nitride (BN) is(are)

Three moles of $B_{2} H_{6}$ are completely reacted with methanol. The number of moles of boron containing product formed is –

The correct statement about $B_{2} H_{6}$ is

The structure of diborane ( $B_{2} H_{6}$ ) contains

Aluminium chloride exists as dimer, $Al_{2} Cl_{6}$ in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives

The number of 2-centre-2-electron and 3-centre-2-electron bonds in $B_{2} H_{6}$ , respectively, are

The relative stability of $+ 1$ oxidation state of group 13 elements follows the order