Iron is rendered passive by treatment with

Iron is rendered passive when treated with conc. :

Iron becomes passive on treatment with

Give reason for the following: Iron is rendered passive with fuming nitric acid.

Give reasons for the following: Iron is rendered passive with fuming nitric acid.

Which fo the following metal is rendered passive by the action of highly concentrated nitric acid (~80%)?

Which of the following is rendered passive by conc. HNO_(3) is

Which of the following metals is rendered passive by conc. HNO_(3) ?