Question

Does colour change occur in a double displacement reaction?

Answer 1

When one element in a compound is replaced by another, it is called a single displacement reaction. Metal can only replace another metal, and a nonmetal can only replace another nonmetal. The other element can only be replaced by a more reactive element in the compound with which it
reacts.

Complete answer:
Double displacement reactions are those in which two compounds react by exchanging ions to produce two new compounds. Positive ions exchange negative ion partners in double replacement reactions. Ionic compounds dissolved in water undergo a lot of double displacement reactions. The general equation represents a double replacement reaction.

A double displacement reaction occurs when two reactants exchange ions, resulting in the formation of two new compounds. In most cases, double displacement reactions result in the formation of a precipitate.

Counter-ion exchange, alkylation, neutralization, acid-carbonate reactions, aqueous metathesis with precipitation (precipitation reactions), and aqueous metathesis with double decomposition are all examples of double displacement reactions (double decomposition reactions). A color change will occur as a result of a double replacement reaction between two solids. The yellow compound of lead iodide is formed when lead ions combine with iodide ions. The potassium ions combine with the nitrate ions to form potassium nitrate, a white compound that cannot be seen because the yellow compound obscures it.

Thus, colour change does not occur in a double displacement reaction.

Note:
A precipitation reaction occurs when two aqueous ionic compounds react to form a new insoluble ionic compound. Here's an example of a reaction between lead (II) nitrate and potassium iodide that produces (soluble) potassium nitrate and (insoluble) lead iodide. A neutralization reaction occurs when an acid and a base react chemically to produce salt and water. The PH of the resulting salt is determined by the PH of the reacting acids and bases.