Q.

Hydrogen gas is liberated when aluminium is treated withA) AirB) Dilute HCl (or) H2SO4C) NaOH (or) KOHD) conc. HNO3

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a

all the above

b

only A, B and C

c

only B, C and D

d

only B and C

answer is D.

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Detailed 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.→ →→ 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.HNO3.
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