Questions
Which of the following element exhibit passivity with conc.
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a
B
b
Al
c
Ga
d
Tl
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Correct option is B
Al initially reacts with conc HNO3 and forms Al2O3 . Aluminium oxide is a very hard substance and so this oxide layer prevents further reaction. Thus, Al is renndered passive by conc HNO3 .
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