A) dil.\[HN{{O}_{3}}\]
B) cone.\[HN{{O}_{3}}\]
C) dil. \[{{H}_{2}}S{{O}_{4}}\]
D) none of these
Correct Answer: B
Solution :
Aluminium becomes passive on treatment with cone.\[HN{{O}_{3}}\]due to the formation of aluminium oxide on its surface which prevents it from further action.
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