Question

Write chemical equation for the event: Iron filings are dropped in the aqueous solution of copper sulphate.

Answer 1

Hint: We know that, in a chemical, a displacement reaction occurs where an atom or a group of atoms is replaced by another atom. A metal can only replace another metal, and a non-metal can only replace another non-metal. Also, the other element can only be replaced by a more reactive element in the compound with which it reacts.

Complete answer: When iron filings are dropped in the aqueous solution of copper sulphate, the iron fillings turn a reddish brown colour. This is when a coating of copper is accumulated on the iron nail's surface.
Since iron is more reactive than copper, it displaces copper from the copper sulphate solution, causing the colour of the solution to change from blue to green as iron sulphate forms.
The reaction is a displacement reaction in which copper is displaced by iron and the formula will be,
\[Fe + CuS{O_4} \to F{e_2}S{O_4} + Cu\]

Additional Information:
A single displacement reaction, also known as a single substitution reaction, is a type of oxidation-reduction chemical reaction in which an ion or element moves out of a compound, replacing one element with another. When a portion of two ionic compounds is exchanged to form two new elements, this is known as a double displacement reaction.

Note:
Combination, decomposition, single-displacement, double-displacement, and combustion are the five basic forms of chemical reactions. By examining the reactants and products of a reaction, you can categorise it into one of these groups. Some reactions will fall into multiple categories.