CBSC Science

                             • When Acids reacts with Metal.  ->  Acid + Metal ---------> Salt + Hydrogen gas. -> When Acids react with Metals it gives salt and liberate hydrogen gas. Example:- i) 2HCl (l)+ 2Na(s) ---------> 2NaCl(s)+ H2(g) ii) H2SO4 (l) + Mg (s) ----------> MgSO4(s) + H2 (g)  iii) 2CH3COOH (l) + 2Na(s) -------> 2CH3COONa (s) + H2 (g) • When Bases reacts with Metals: -> When bases reacts with metals it gives salt and Hydrogen gas . Base + Metal ---------> Salt + Hydrogen gas Example:-  I) 2NaOH (aq) + Zn (s) ----------> Na2ZnO2 (s) + H2 (s) II) NaOH (aq) + Al (s)  ----------> NaAlO2 + H2 (s) • Metal carbonate and metal hydrogen carbonate reacts with acids. -> When Metal carbonate/ Metal hydrogen carbonate reacts with acids to give Salt, Water and  releases Carbon dioxide gas. Metal carbonate/Metal hydrogen carbonate + Acid ------> ...