Answer :
I'm sorry, but the correct answer to the question "Metals react with dilute acids to liberate" is:
b. hydrogen gas
When metals react with dilute acids, they release hydrogen gas. This is because metals displace hydrogen from acids in a single displacement reaction. For example, when zinc reacts with hydrochloric acid, it forms zinc chloride and hydrogen gas is released:
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
This is a common reaction observed when metals like magnesium, iron, or aluminum react with acids like hydrochloric acid or sulfuric acid. The liberation of hydrogen gas is a characteristic feature of such reactions between metals and acids.
