Write the balanced equation for the following chemical reaction: 

Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride

Reactions in chemistry essentially involve the creation of new compounds through the reaction of certain elements or compounds, and these new compounds have unique features that set them apart from the original molecules. The initial chemicals serve as the reactants, while the newly created compounds are referred to as products. We have a typical way to write a balanced chemical equation to express it.

We must take certain factors into account in order to build a balanced chemical equation. when a chemical reaction is balanced. Coefficients and subscripts are important.
As they contribute to the makeup and characteristics of the chemical substance, subscripts are an essential component that cannot be modified. While coefficients show the quantity of precursor molecules needed to create the final product.
Take the case of barium chloride plus aluminium sulphate over barium sulphate plus aluminium chloride as an example.
The chemical formulas for all of the aforementioned reactants and products are known.

Barium chloride is - BaCl₂
Aluminium sulphate is - Al₂(SO4)₃
Barium sulphate is - BaSO₄
And lastly Aluminium chloride is - AlCl₃

_{The chemistry can be expressed as follows:}

${\mathrm{BaCl}}_2+{\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3\to {\mathrm{BaSO}}_4+{\mathrm{AlCl}}_3$

_{Aluminum sulphate is a gas, barium sulphate is a solid material once more, and aluminium chloride is a solid. The barium chloride is present in solid crystalline form.
As a result, we shall subscript each compound's condition in our writing. The response will appear as,}

BaCl₂(s)+Al₂(SO₄)₃(g)→BaSO₄(s)+AlCl₃(s)

We will now equalise the equation by placing the same amount of atoms from compounds on both sides. We shall achieve this by giving the compounds coefficients.
The balanced chemical reaction can be expressed as,

3BaCl₂(s)+Al₂(SO₄)₃(g)→3BaSO₄(s)+2AlCl₃(s)
Hence, option A is correct.