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Iron is rendxred passive by treatment with concentrated

$ (a)\;HCl \\(b)\;HNO_3\\(c)\;H_3PO_4\\ (d)\;H_2SO_4 $
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Iron is rendxred passive by treatment with concentrated $HNO_3$
Hence b is the correct answer.
answered Mar 17, 2014 by meena.p
 

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