Extraction of Metals - Result Question 41

####41. Iron is rendered passive by treatment with concentrated

(a) H2SO4

(b) H3PO4

(c) HCl

(d) HNO3

(1982)

Objective Questions II

(One or more than one correct option)

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Solution:

  1. Iron is rendered passive by concentrated HNO3 due to formation of a thick protective layer of Fe3O4.


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