Question

When metals react with acids they form corresponding salt and_____. 
1. chlorine
2. oxygen
3. hydrogen
4. hydroxide

Answer 1

Correct Answer - Option 3 : hydrogen

The correct answer is hydrogen.

• When a metal reacts with acids, displacement reaction take place to form a salt and hydrogen gas.
• The general chemical equation for this reaction is:
  •  Metal + Acid → Salt + Hydrogen gas
• For example, when Sodium (Na) reacts with hydrochloric acid (HCl) then sodium chloride (NaCl) and hydrogen gas (H2) form.
  • 2 Na (s) + 2 HCl (aq) → 2 NaCl (s) + H2 (g)
  •  Zn(s) + 2HCl (aq) → ZnCl₂ (aq) + H₂ (g)
• Non-metals do not react with acids because non-metals are themselves acceptors of electrons so there is no way they can donate electrons to the hydrogen ion of the acid.