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Sn, Pb + HCl, HNO
3
Pb
Pb + HCl
XX
Pb + 4 HNO
3
Pb(NO
3
)
2
+ 2 NO
2
+ 2 H
2
O
Sn
Sn + HCl
XX
Sn + 4 HNO
3
SnO
2
+ 4 NO
2
+ 2 H
2
O
XX XX
