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Among the metals, Fe, Zn, Pb, Ag and Pt which do not give a metal nitrate on treatment with concentrated `HNO_(3)`

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Among the metals, Fe, Zn, Pb, Ag and Pt which do not give a metal nitrate on treatment with concentrated `HNO_(3)`
A. Fe and Zn
B. Fe and Pt
C. Pb, Ag and Pt
D. Fe, Ag and Pt
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Correct Answer - B
When iron is treated with conc. `HNO_(3)`, it becomes passive due to the formation of a protective layer of `FeO.Fe_(2)O_(3)` on its surface. Pt, on the other hand, being a noble metal does not react with conc. `HNO_(3)`.
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