Question

What information does the following chemical equation convey? a)Zn + H2SO4 -> ZnSO4 + H2 b) Mg + 2Hl -> MgCl2 + H2

Answer 1

Hi friend, Here is the required answer :-

The first equation conveys that Zinc metal reacts with Sulphuric acid to give rise to Zinc Sulphate and Hydrogen gas. In this reaction, zinc being a more reactive metal displaces Hydrogen from its sulphate solution. So this a displacement reaction.

The second equation should be Mg+2HCl - MgCl2+ H2.


The second equation conveys that Magnesium reacts with hydrochloric acid to form Magnesium Chloride and Hydrogen gas. Magnesium displaces Hydrogen from its solution, thus it is a displacement reaction.


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Answer 2

a) Zn + H₂SO₄ ------>ZnSO₄ + H₂O

Here Zn has displaced 'H₂' from its sulfate solution and formed its own sulfate solution that is ZnSO₄. This tells us that Zn (Zinc) is more reactive than H₂(Hydrogen). If you observe the chemical reactivity series also you can see that Zinc has been placed quite higher than hydrogen.So Zinc is more reactive element and hydrogen less reactive . This process is called displacement reaction.

b) Mg + 2HCl-------->  MgCl₂ + H₂
(you have missed the letter 'C')

Here, ,Mg displaces H₂ from its compound and forms its own compound i.e MgCl₂ (Magnesium chloride)
This tells us that Magnesium is more reactive element than hydrogen as it is able to displace H₂.
If you observe the Chemical reactivity series, Magnesium has been placed at a higher position than hydrogen.

This is a displacement reaction in which a more reactive element (Mg) displaces a less reactive element (H₂) from its compound

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