Question

The reaction in which ions in the reactants are exchanged to form a precipitate is called as ______ reaction.

Options

• Combination

• Decomposition

• Displacement

• Double Displacement

Answer 1

The reaction in which ions in the reactants are exchanged to form a precipitate is called as double displacement reaction.

Explanation:

When the ions of two compounds exchange places and a new compound is formed, either of which can be a precipitate, gas or water (H₂O), it is called a pair displacement reaction.

\[\ce{BaCl2 ​ + Na2​SO4 -> BaSO4 ​(precipitate) + 2NaCl}\]

In this reaction, BaSO₄ (barium sulphate) is formed as a precipitate.