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Yes, metal can react with concentrated acid to form hydrogen and metal salt.

Zn + 2HCl --------------> ZnCl₂ + H₂
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Yes concentrated acids can react with metals and they liberate hydrogen gas and salt 

for example :

Mg+2HCL ----------------------------> MgCl₂ + H₂ ..
                      MgCl₂ is a salt (metallic) and H₂ is the gas liberated

when non metals are dissolved in water they produce acids. all metals are alkali in nature but every alkali is a metal in nature.these metals they act as a base when they are dissolved in acids (concentrated).
                                                               Hope this answer would help you.....
                                                                                         thank you.....
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