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Amongst the following the metals which b...

Amongst the following the metals which become passive when dipped in conc. `HNO_(3)` are Sn, Pb, Fe, Cr, Zn, Ni, Hg, Al, Cu.

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The correct Answer is:
4
4, i.e., Fe, Cr, Ni and Al become passive when dipped in conc. `HNO_(3)`.
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