Question

Rusting of iron is a chemical reaction. The reaction is:

• A. double decomposition
• B. combination
• C. displacement
• D. analysis

Answer 1

The Correct Option is B

Answer (b) combination

Answer 2

principal classes of chemical reactions

Addition reactions are another name for combination reactions. A combination reaction is one in which the atoms of two or more compounds come together to generate a single product. Often, it is shown as A+B\(\rightarrow \)AB.

Example:

H₂+\(\frac{1}{2}\)O₂→H₂O

Decomposition reactions—A reaction is referred to be a decomposition reaction when a single chemical is divided into two or more products. It is the combo reaction's exact opposite. Typically, it is shown as

 

AB→A+B.

Example: CaCO₃ →CaO+CO₂

Displacement reactions are defined as those in which a more electronegative element displaces a less electronegative element from the salt of the element's aqueous solution. Often, it is written as A+XY → AY+X.

 

For instance, Zn+CuSO₄\(\rightarrow\)ZnSO₄+Cu

 

A reaction is referred to as a double-displacement reaction when it involves the exchange of ions between the reactants. It is often written as AB+XY\(\rightarrow\)AY+XB.

Examples are Na₂S+2HCl\(\rightarrow \)2NaCl+H₂S.

 

 

Rusting is a phenomenon caused by the oxidative assault of oxygen and moisture on iron surfaces, which results in the production of an iron oxide known as rust. Below is a representation of the process's chemical reaction:

4Fe+2H₂O+3O₂→2Fe₂O₃⋅H₂O

It is hence a combination reaction.

 

Thus, the alternative is the right response (B).