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action of acid

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   + 2H_2­O

Silver

Ag + 2HNO₃                   Ag NO₃ + NO₂   + H₂O

 

2Ag + 2 H₂SO₄                       Ag₂SO₄ + SO₂   + 2H₂O