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HNO
3
Cu + O
2
Cu + 2HCl
XX
Cu(NO
3
)
2
+ 2 NO
2
+ 2 H
2
O
Mn + HCL
Cu
Cu + 2HCl
XX
Cu + 4 HNO
3
Cu(NO
3
)
2
+ 2 NO
2
+ 2 H
2
O
Ag
Ag + HCl
XX
4 Ag + 6 HNO
3
4 AgNO
3
+ NO
2
+ NO + 3 H
2
O
XX XX