Question

identify the type of chemical reaction in the following statement and define each of them
a)magnesium + hydrochloric acid - magnesium chloride + hydrogen​

Answer 1

Answer :-

Word equation :-

Magnesium + Hydrochloric acid → Magnesium Chloride + Hydrogen

Chemical equation :-

Mg + HCl → MgCl₂ + H₂

Balanced chemical equation :-

Mg + 2HCl → MgCl₂ + H₂

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In this reaction, magnesium being more reactive than hydrogen, displaces it from 'HCl' and forms two new products i.e. Magnesium Chloride and Hydrogen gas.

So, it is a displacement reaction [single].

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Displacement reaction : This reaction occurs, when an element (more reactive) displaces another element (less reactive) from it's compound.

Some other examples :-

• Fe (s) + CuSO₄ (aq) → FeSO₄ (aq) + Cu (s)

• Pb (s) + CuCl₂ (aq) → PbCl₂ (aq) + Cu (s)

Answer 2

Required Answer :-

We know that

Magnesium is denoted by Mg

Hydrochloric acid is denoted by HCI

Magnesium chloride is denoted by MgCI₂

Hydrogen is denoted by H₂

Balanced equation will be :-

Mg + 2HCl ⇒ MgCl₂ + H₂

The reaction is a type of displacement reaction or replacement reaction.

As the word defines that there is a replacement between the elements in the reaction

Equation for displacement reaction

AB + C ⇒ A + BC