Answer:- 
Explanations:- It is given that the charge for A is +2 and the charge for B is -3. The over all compound is neutral means the over all charge is zero. For making the over all charge zero, we need 3 positive ions and 2 negative ions. This makes a +6 charge for A and -6 charge for B and the over all charge is zero.
Also, if we think about the criss cross then charge of A becomes the subscript of B and the charge of B becomes the subscript of A.
So, the formula of the ionic compound is
. In this compound the ratio of A to B is 3:2.
The balanced equation could be shown as:

Because all matter has density and since air has density then air is matter and plus EVERYTHING is made of matter
They will attract each other. Similar to the saying opposites attract.