Question

Molecular formula of Gallium chloride is:

• A. $\text{GaCl}$
• B. $\text{GaC}{\text{l}}_5$
• C. $\text{GaC}{\text{l}}_{\text{3}}$
• D. $\text{G}{\text{a}}_{\text{2}}\text{C}{\text{l}}_{\text{2}}$

Answer 1

The correct option is C $\text{GaC}{\text{l}}_{\text{3}}$

Gallium is a 13th group element whose valency is 3. So it forms a chloride of the formula $GaC{l}_3$. (Formula is given in cris cross method)

The oxidation number of $Ga$ is $+3$ and $Cl$ is $-1$. Criss-cross method gives absolute values of $GaC{l}_3$

Hence, the correct op[tion is $\left(C\right)$.