Question

What is the chemical formula of aluminium chloride?

• A. $AlC{l}_3$
• B. $AlC{l}_2$
• C. $A{l}_{2}C{l}_3$
• D. $AlCl$

Answer 1

The correct option is A $AlC{l}_3$

Aluminium is a cation with a positive charge of 3 and is expressed as ${Al}^{3+}$.

Chlorine is an anion with negative charge of 1 and is expressed as ${Cl}^{1-}$.

After cross multiplication, aluminium chloride has the formula of $AlC{l}_3$.