Question

The formula of a metal oxide is $M_2{O}_3$. If the metal forms its chloride, what will the formula of that compound be?

• A. $M_{2}Cl$
• B. $MC{l}_2$
• C. $M_{3}Cl$
• D. $MC{l}_3$

Answer 1

The correct option is D $MC{l}_3$

We know the valency of oxygen is 2, so from the formula $M_2{O}_3$, we get to know the valency of M is 3.

Valency of chlorine is 1.
So, for chloride of M:
$\begin{array}{ccc}Symbol:& M& Cl\\ Valency:& 3& 1\end{array}$

The formula will be $MC{l}_3$.