Question

X is an ionic compound containing
only magnesium, aluminium and
oxygen. Which of the following can be
the formula of X?
a. Mg AIO
b. MgAl204
c. MgAIOA
d. Mg,AIO​

Answer 1

Answer:

b. MgAl204

Explanation:

Net charge on an ionic compound is always zero.

Mg has a charge of 2+, Al has 3+ and O has 2-

Let's look at the options and calculate the net charge. Among the given options, MgAl2O4 is the best answer.

Because its net charge is 0 -> (1)(+2) + 2(+3) + 4(-2) = 0.