First slide

13th group or boron group

Question

Which of the following element exhibit passivity with conc. $H N O_{3}$

Easy

A

B
B

Al
C

Ga
D

Tl

Solution

Al initially reacts with conc $H N O_{3}$ and forms $A l_{2} O_{3}$ . Aluminium oxide is a very hard substance and so this oxide layer prevents further reaction. Thus, Al is renndered passive by conc $H N O_{3}$ .

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