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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.