Why does zinc liberate hydrogen gas when it reacts with dilute hydrochloric acid but copper does not ?

Question

Answer

Zinc is more reactive than hydrogen so it liberates hydrogen gas from hcl whereas copper is less reactive than that of hydrogen so it cant liberate hydrogen gas from hcl.......

Answer

Zinc is an amphoteric oxide and it is more reactive than hydrogen but copper is less reactive than hydrogen so copper doesn't displaces hydrogen but zinc does.

I hope it helps !!

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Also becoz of evolution of gas.....

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In electrochemical series the metal below the hydrogen produced hydrogen gas when react with acid.               Zn is below the hydrogen in electrochemical series, but Cu not.

Answer

Introduction:
When zinc reacts with dilute hydrochloric acid, it liberates hydrogen gas, but copper does not. This can be explained based on the reactivity series of metals and their ability to displace hydrogen from acids.

Reactivity Series:
The reactivity series is a list of metals arranged in order of their reactivity with water or acids. It helps us understand the behavior of metals when they react with other substances.

Zinc:
Zinc is an active metal and is placed higher in the reactivity series than hydrogen. This means that zinc has a higher tendency to lose electrons and form positive ions compared to hydrogen. When zinc reacts with dilute hydrochloric acid, the following reaction occurs:

Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

In this reaction, zinc displaces hydrogen from the hydrochloric acid and forms zinc chloride. The liberated hydrogen gas is given off as a byproduct.

Copper:
Copper, on the other hand, is a less reactive metal and is placed lower in the reactivity series than hydrogen. This means that copper has a lower tendency to lose electrons and form positive ions compared to hydrogen. When copper is added to dilute hydrochloric acid, no reaction occurs because copper cannot displace hydrogen from the acid.

Explanation:
The reactivity of a metal depends on its ability to lose electrons and form positive ions. Metals higher in the reactivity series have a greater tendency to lose electrons and react with other substances. In the case of zinc, it is more reactive than hydrogen and can displace hydrogen from hydrochloric acid. However, copper is less reactive than hydrogen and cannot displace it from the acid.

The reactivity of metals depends on factors such as atomic structure and the ease with which they can lose electrons. Zinc has a relatively low ionization energy, allowing it to easily lose electrons and form positive ions. Copper, on the other hand, has a higher ionization energy, making it less likely to lose electrons and react with acids.

Conclusion:
In summary, zinc liberates hydrogen gas when it reacts with dilute hydrochloric acid because it is more reactive than hydrogen. It can displace hydrogen from the acid due to its ability to easily lose electrons and form positive ions. Copper, being less reactive than hydrogen, does not react with hydrochloric acid and does not liberate hydrogen gas. The reactivity series provides a useful tool for predicting the behavior of metals when they come into contact with other substances.

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