Find the total number of metals, which makes a thin protective layer of its oxide on treatment with conc. HNO_(3) Al,Zn,Sn,Cu,Pt,Cr,Au,Ag

Find the total number of metals, which makes a thin protective layer o

1.	Find the total number of metals, which makes a thin protective layer of its oxide on treatment with conc. HNO_(3) Al,Zn,Sn,Cu,Pt,Cr,Au,Ag
Answer» SOLUTION :`AI,CR`