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Q.

Iron is made inactive or passive by:

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a

H3PO4

b

conc. HNO3

c

conc. H2SO4

d

dil. HNO3

answer is B.

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Detailed Solution

Iron is made inactive or passive by oxidizing agent such as conc. nitric acid, chromic acid, and acidified KMnO4. the cause of this is the formation of a film of oxide on the surface of themetal.
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