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

Question

The number of metals that show passivity with concentrate HNO3 among Cr, Fe, Ni, Cu, Zn, Al, Ag, Sn (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

Cr,Fe,Ni and Al react with conc. H N O3 to form a protective oxide layer which protest the metal surface from further reaction.

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

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