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  4. The number of metals that show passivity with concentrate HNO3 among Cr, Fe, Ni, Cu, Zn, Al, Ag, Sn

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Q. The number of metals that show passivity with concentrate $HNO_{3}$ among

Cr, Fe, Ni, Cu, Zn, Al, Ag, Sn

NTA AbhyasNTA Abhyas 2022

Solution:

$Cr,Fe,Ni$ and $Al$ react with conc. $H N O_{3}$ to form a protective oxide layer which protest the metal surface from further reaction.