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Chemical Properties of Boron Family - Practice Questions & MCQ

Chemical Properties of Boron Family - Practice Questions & MCQ

Edited By admin | Updated on Sep 18, 2023 18:35 AM | #JEE Main

Quick Facts

Chemical Properties of Group 13 is considered one of the most asked concept.
48 Questions around this concept.

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Which of the following statements about the chemical properties of Group 13 elements is true?

They tend to form covalent bonds with nonmetals

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They exhibit an oxidation state of -3 in their compounds

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They are generally unreactive with other elements

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They have high electron affinities

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Which of the following statements is true regarding the chemical properties of Group 13 elements?

They exhibit metallic character.

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They have a strong tendency to form compounds in the +1 oxidation state.

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They react with acids to form salts.

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They form hydrides that are strong reducing agents.

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Which one of the following elements will remain as liquid inside pure boiling water?

$\mathrm{Li}$

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$\mathrm{Ga}$

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$\mathrm{Cs}$

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$\mathrm{Br}$

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The hybridization of Boron in the product formed in the given reaction is:

$\mathrm{B}+\mathrm{HNO}_3 \rightarrow$

$s p$

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$s p^2$

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$s p^3$

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$s p^3 d$

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Which gas is liberated when Al reacts with NaOH :

$\mid \mathrm{Cl}_2$

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H₂

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O₂

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None of these

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Alums are

Coordination compounds

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Double salts

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complex salt

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none of these

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Anhydrous $\mathrm{AlCl}_3$ is

covalent

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Ionic

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network solid

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None of the above

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Aqueous $\mathrm{AlCl}_3$ is

covalent

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Ionic

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Network solid

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Dimetric in nature

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The formula of Chrome Alum is:

$\mathrm{K}_2 \mathrm{SO}_4 \cdot \mathrm{Al}_2\left(\mathrm{SO}_4\right)_3 \cdot 24 \mathrm{H}_2 \mathrm{O}$

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$\mathrm{Na}_2 \mathrm{SO}_4 \cdot \mathrm{Cr}_2\left(\mathrm{SO}_4\right)_3 \cdot 24 \mathrm{H}_2 \mathrm{O}$

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$\mathrm{K}_2 \mathrm{SO}_4 \cdot \mathrm{Cr}_2\left(\mathrm{SO}_4\right)_3 \cdot 24 \mathrm{H}_2 \mathrm{O}$

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$\mathrm{K}_2 \mathrm{SO}_4 \cdot \mathrm{Fe}_2\left(\mathrm{SO}_4\right)_3 \cdot 24 \mathrm{H}_2 \mathrm{O}$

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Which of the following compound acts as a catalyst in Friedel-Craft reaction?

$B F_3$

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$\mathrm{NaBH}_4$

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$H B F_4$

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$\mathrm{Na}\left[\mathrm{B}(\mathrm{OH})_4\right]$

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Concepts Covered - 1

Chemical Properties of Group 13

Reaction towards air
Boron is unreactive in crystalline form. Aluminium forms a very thin oxide layer on the surface which protects the metal from further attack. Amorphous boron and aluminium metal on heating in air form B₂O₃ and Al₂O₃ respectively. With dinitrogen at a high temperature they form nitrides.

$\begin{array}{l}{2 \mathrm{E}(\mathrm{s})+3 \mathrm{O}_{2}(\mathrm{g}) \longrightarrow 2 \mathrm{E}_{2} \mathrm{O}_{3}(\mathrm{s})} \\ {2 \mathrm{E}(\mathrm{s})+\mathrm{N}_{2}(\mathrm{g}) \longrightarrow 2 \mathrm{EN}(\mathrm{s})}\end{array}$
Where E is an element

The nature of these oxides varies down the group. Boron trioxide is acidic and reacts with basic (metallic) oxides forming metal borates. Aluminium and gallium oxides are amphoteric and those of indium and thallium are basic in their properties.

Reactivity towards acids and alkalies
Boron does not react with acids and alkalies even at moderate temperature; but aluminium dissolves in mineral acids and aqueous alkalies and thus shows amphoteric character. Aluminium dissolves in dilute HCl and liberates dihydrogen.

$2 \mathrm{Al}(\mathrm{s})+6 \mathrm{HCl}(\mathrm{aq}) \rightarrow 2 \mathrm{Al}^{3+}(\mathrm{aq})+6 \mathrm{Cl^{-}(aq)+3H_{2}(g)}$

However, concentrated nitric acid renders aluminium passive by forming a protective oxide layer on the surface.
Aluminium also reacts with aqueous alkali and liberates dihydrogen.

$2 \mathrm{Al}(\mathrm{s})+2 \mathrm{NaOH}(\mathrm{aq})+6 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})\: \rightarrow \: 2 \mathrm{Na}^{+}\left[\mathrm{Al}(\mathrm{OH})_{4}\right]^{-}(\mathrm{aq})+3 \mathrm{H}_{2}(\mathrm{g})$