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2014-10-26T04:33:47+05:30

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When metals react with acids, Hydrogen gas and metal salt are produced.

       2 Na + 2 H Cl  ==> 2 Na Cl + H₂
                            Heat

Similarly other metals also produce the salt and hydrogen.

When metals react with bases, hydrogen gas is produced.  With some metals and weak bases, nothing may happen.
 
       2 Na OH + Zn  ==>  H₂ +  Na₂ (Zn O₂)    (sodium zincate) 
                             heat
      Zn + 2 H₂ O  + Na OH  ====>  Na₂ (Zn (OH)₄)  + H₂ 


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