Extraction of Metals - Result Question 41

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

(a) $H _2 SO _4$

(b) $H _3 PO _4$

(c) $HCl$

(d) $HNO _3$

(1982)

Objective Questions II

(One or more than one correct option)

Show Answer

Solution:

  1. Iron is rendered passive by concentrated $HNO _3$ due to formation of a thick protective layer of $Fe _3 O _4$.


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