Fe is made passive by : \( \mathrm{P} \) (a) dil. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) (b) dil. ...

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Fe is made passive by :
\( \mathrm{P} \)
(a) dil. \( \mathrm{H}_{2} \mathrm{SO}_{4} \)
(b) dil. \( \mathrm{HCl} \)
W
(c) conc. \( \mathrm{HNO}_{3} \)
(d) conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \)
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