Question

the formula of a metal chloride is mcl3,the formula iof its oxide

Answer 1

The stoichiometric coefficient of M is 1 that will be valency of Cl and the stoichiometric coefficient of Cl  is 3 which will be valency of M Hence MCl3= M^3+  and 3Cl^1- This empties M^3+ and O^2- = M2O3 this will be the formula of metal oxide

Answer 2

The formula of its oxide is $M_2O_3$.

• The given formula of the metal chloride is $MCl_3$.
• Thus here the metal M exist as $M^{+3}$ ion and Cl exist as chloride ion or $Cl^-$ ion.
• Again oxide exists as $O^{2-}$ ion and metal exist as $M^{+3}$ ion. So, according to the criss cross method M will get the charge of the oxide and the oxygen will get the charge of the metal and te formula of the metal oxide is $M_2O_3$.