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Chemistry Question on p -Block Elements

Which of the following chemicals does not liberate hydrogen gas on reaction with aluminium metal?

A

Dil sulphuric acid

B

Aqueous sodium hydroxide

C

Dil hydrochloric acid

D

Conc. nitric acid

Answer

Conc. nitric acid

Explanation

Solution

Dilute and concentrated HNO3 {HNO_3} has no effect on Al, Aluminium is rendered passive by nitric acid due to the fopnation of a thin. film of oxide (Al2O3)(Al_2O_3) on its surface.
Aluminium dissolves in dil . HCl and liberates dihydrogen.
2Al(S)+6HCl(aq)−>2Al(aq)3++6Cl(aq)−+3H2(g){ 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)+6H2O(l)−>2Na[Al(OH)4](aq)+3H2(g){ 2Al_{(S)} + 2NaOH_{(aq)} + 6H_2 O_{(l)} -> 2 Na[Al(OH)_4]_{(aq)} + 3H_{2(g)}}
2Al+6HNO3(conc)−>Al2O3+6NO2+3H2O{ 2Al + 6HNO_{3(conc)} -> Al_2O_3 + 6 NO_2 + 3H_2O}
2Al+6H2SO4−>Al2(SO4)3+3SO2+6H2O{ 2Al + 6 H_2SO_4 -> Al_2 (SO_4)_3 + 3SO_2 + 6 H_2O}