Iron is rendered passive by treatment with concentrated:
A
H2SO4
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B
H3PO4
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C
HCl
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D
HNO3
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Solution
The correct option is DHNO3 The inertness exhibited by metals under condition in which chemical activity is expected is known as passivity. The phenomenom of passivity is explained by assuming the formation of a thin film of oxide on the surface of the metal which prevents the action of the regents.
The concentrated nitric acid makes metal such as iron, cobalt, nickel, chromium, aluminium, etc. passive.