Question:
Which of the following chemicals does not liberate hydrogen gas on reaction with aluminium metal?
Which of the following chemicals does not liberate hydrogen gas on reaction with aluminium metal?
Updated On: Jun 21, 2022
- Dil sulphuric acid
- Aqueous sodium hydroxide
- Dil hydrochloric acid
- Conc. nitric acid
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The Correct Option is D
Solution and Explanation
Dilute and concentrated $ {HNO_3}$ has no effect on Al, Aluminium is rendered passive by nitric acid due to the fopnation of a thin. film of oxide $(Al_2O_3)$ on its surface.
Aluminium dissolves in dil . HCl and liberates dihydrogen.
$ { 2Al_{(S)} + 6 HCl_{(aq)} -> 2 Al^{3+}_{(aq)} + 6 Cl^-_{(aq)} + 3H_{2(g)}}$
Aluminium also reacts with aqueous alkali and liberates dihydrogen.
$ { 2Al_{(S)} + 2NaOH_{(aq)} + 6H_2 O_{(l)} -> 2 Na[Al(OH)_4]_{(aq)} + 3H_{2(g)}}$
$ { 2Al + 6HNO_{3(conc)} -> Al_2O_3 + 6 NO_2 + 3H_2O}$
$ { 2Al + 6 H_2SO_4 -> Al_2 (SO_4)_3 + 3SO_2 + 6 H_2O}$
Aluminium dissolves in dil . HCl and liberates dihydrogen.
$ { 2Al_{(S)} + 6 HCl_{(aq)} -> 2 Al^{3+}_{(aq)} + 6 Cl^-_{(aq)} + 3H_{2(g)}}$
Aluminium also reacts with aqueous alkali and liberates dihydrogen.
$ { 2Al_{(S)} + 2NaOH_{(aq)} + 6H_2 O_{(l)} -> 2 Na[Al(OH)_4]_{(aq)} + 3H_{2(g)}}$
$ { 2Al + 6HNO_{3(conc)} -> Al_2O_3 + 6 NO_2 + 3H_2O}$
$ { 2Al + 6 H_2SO_4 -> Al_2 (SO_4)_3 + 3SO_2 + 6 H_2O}$
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Concepts Used:
P-Block Elements
- P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
- P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.
P block elements consist of:
- Group 13 Elements: Boron family
- Group 14 Elements: Carbon family
- Group 15 Elements: Nitrogen family
- Group 16 Elements: Oxygen family
- Group 17 Elements: Fluorine family
- Group 18 Elements: Neon family