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20 Ag - + H
2
SO
4
HNO
3
21 Fe + - H
2
SO
4
HNO
3
22 Pb + - HCl H
2
SO
4
23 Ca - + HNO
3
HNO
3
24 Sn + - HCl H
2
SO
4
25 Zn + - HNO
3
H
2
SO
4
26 Cr + - H
2
SO
4
HNO
3
27 Ba - + HCl HNO
3
28 Cu - + H
2
SO
4
HNO
3
29 Na + - HCl H
2
SO
4
30 Be + - HNO
3
HNO
3
