action of acid

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Reaction of dilute Acid with metals: -
Copper
2Cu+4HCl+O2 (air)                        2CuCl2 + 2H2O

2Cu + 2H2So4+ O2 (air)                      2Cu So4 + 2H2O
 

3Cu + 8HNO3                         3Cu (NO3)2 + 2NO    + 4H2O

Chromium
Cr + 2HCl                       CrCl2 + H2
 

Cr + H2So4                                CrSo4 + H2

Zinc
Zn + 2HCl                       ZnCl2 + H2
 

Zn + H2So4                           ZnSo4 + H2
 

4Zn + 10HNO3 (dil)                   4Zn (NO3)2 + N2O    + 5H2O

4Zn + 10HNO3 (Very dil)                     4Zn (NO3)2 + NH4NO3 + 3H2O

Silver
3Ag + 4HNO3                            3Ag NO3 + NO   + 2H2O

Gold
2Au + 9HCl + 3HNO3                      2AuCl3 + 6H2O + 3NOCl

Reaction of concentrated Acid with metals: -
Copper
Cu + 2H2SO4                         Cu So4 + SO2   + 2H2O
 

Cu + 4HNO3                           Cu (NO3)2 + 2NO2    + 2H2O
Chromium
2Cr + 6H2SO4                           Cr2(So4)3 + 3SO2  + 6H2O
Zinc
Zn + 2H2So4                         ZnSo4 + SO2   + 2H2­O
Silver
Ag + 2HNO3                   Ag NO3 + NO2   + H2O
 

2Ag + 2 H2SO4                       Ag2SO4 + SO2   + 2H2O






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