First slide

Uses of Boron & Aluminium

Question

Hydrogen gas is liberated when aluminium is treated with
A) Air
B) Dilute HCl (or) H₂SO₄
C) NaOH (or) KOH
D) conc. HNO₃

Easy

A

all the above
B

only A, B and C
C

only B, C and D
D

only B and C

Solution

→ Al metal is stable in dry air due to the formation of protective oxide layer on its surface.Therefore H₂ gas is not liberated when Al is treated with air.
→ $2Al + 6HCl \to AlC{l_3} + 3{H_2} \uparrow$
$2Al + 3{H_2}S{O_4} \to A{l_2}{(S{O_4})_3} + 3{H_2} \uparrow$
→ $2Al + 2NaOH \to \mathop {2NaAl{O_2}}\limits_{Sodium\,\,\,metaaluminate} + {H_2} \uparrow$
→ Al is passive or reluctant to the action of Conc.HNO₃ due to the formation of protective oxide layer on its surface in presence of Conc.HNO_3.

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