Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid.

41 What type of oxides are formed when metals combine with oxygen? Explain with the help of an example. 42 Explain why, metals usually do not liberate hydrogen gas with dilute nitric acid. 43 How do metals react with hydrogen? Explain with an example. 43 How do non-metals react with hydrogen? Explain with an example.