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Chemistry
Chemistry
Problem
Iron is rendered passive by treatment with : a.
H
2
SO
4
\text{H}_2\text{SO}_4
H
2
SO
4
(dil.) b.
H
2
PO
4
\text{H}_2\text{PO}_4
H
2
PO
4
conc.
HNO
3
\text{HNO}_3
HNO
3
d.
HCl
\text{HCl}
HCl
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