Question

What is the formula for Barium Oxide?

Answer 1

Hint : We have to know that we have to cross over the numerical value of each of the ions to become the subscript of another ion. We know that Barium peroxide is the inorganic compound and the chemical formula of the compound is $BaO$ .

Complete Step By Step Answer:
We know that the crisscross method is used to determine the chemical formula. We can write the chemical formula of the ionic compound by the following steps using criss cross method,
We have to write symbols and charges of the anion and cation. The cation is written first, and then anion is written.
We have to transpose the number of positive charges to become the subscript of the anion and the number of negative charges to become the subscript of the cation.
We have to reduce to the smallest ratio.
The final chemical formula has to be written and the subscript that has one is left off.
Barium oxide is an ionic compound, composed of a barium metal cation, and an oxygen non-metal anion. Looking at the periodic table, oxygen is in group 6 or 16, and will therefore have an oxidation number of $-2,$ while barium sits in group two, and will have an oxidation number of $+2.$
So, one ion of barium neutralizes one ion of oxygen, and so those two combine to form barium oxide, $BaO$ .

Note :
We have to remember that the barium peroxide is mainly used to produce hydrogen peroxide by reaction of barium peroxide with sulphuric acid. We can write the chemical equation for this hydrogen peroxide preparation.