下列反应能否反应，能反应，请写出化学方程式。    

(1) Fe和稀H₂SO₄：________________________________________________________。    

(2)汞和硫酸锌溶液：________________________________________________________。    

(3)Al和硝酸银溶液：________________________________________________________。    

(4) Ag和稀盐酸：___________________________________________________________。