Question

why Hydrogen gas is released when metals react with acid.​

Answer 1

Word equation

hydrochloric acid + magnesium → magnesium chloride + hydrogen gas

Chemical equation 2 HCl + Mg → MgCl2 + H2

General equation acid + metal → salt + hydrogen

conclusion:

If we reacte metal with H2SO4 acid then metal combine with SO4 and hydrogen is released

because Atoms are always competing with each other for valence electrons. Hydrogen "wants" those electrons. So an active metal reacts with acids to produce hydrogen.

Answer 2

Answer:

Dilute acids react with relatively reactive metals such as magnesium, aluminium, zinc and iron. The products of the reaction are a salt plus hydrogen gas.

metal + acid → salt + hydrogen

Here’s a good way to remember it: MASH (M+A→S+H)

may this answer help u