Chemistry · Oct / Nov 2016 · Paper 12 · Question 32

When reacted with an excess of dilute hydrochloric acid, 0.002 moles of a metal M liberated 48 cm³ of hydrogen measured at r.t.p. Which equation is correct for this reaction?

1. A2M + 2H⁺ → 2M⁺ + H₂
2. BM + H⁺ → M⁺ + H
3. CM + 2H⁺ → M²⁺ + H₂
4. DM + 2H⁺ → M²⁺ + 2H

As printed in the paper