Question

zinc liberates hydrogen gas when reacted with dilute hydrochloric acid whereas copper dies not .explain ,why ?

Answer 1

Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid whereas copper does not because it depends on the reactivity of metal to get the hydrogen gas as the product with dilute acid. When zinc react with "dilute hydrochloric acid" it forms zinc chloride with hydrogen gas.  

$Zn (s) + 2 HCl (aq) \rightarrow ZnCl_{2} (aq) + H_{2} (g)$

But same reaction does not occur with copper metal because copper is less reactive than hydrogen. Therefore, copper cannot replace hydrogen from "hydrochloric acid" to form "copper chloride" and hydrogen like zinc.

Answer 2

Answer:Answer: Reaction depends upon the reactivity of metals. Copper is less reactive than zinc. Copper is also known as noble metal along with gold, silver, etc. that are very less reactive under normal conditions. This is the cause that copper does not react with dilute hydrochloric acid and consequently does not liberate hydrogen gas while zinc does.

Explanation:give me vote