Question

Which of the following is not a correct formula? A)Ba2O B)Ca3N2 C)KCl D)Li2S

Answer 1

Answer:- A.
`Ba_2O` is not the correct formula.

Explanations:- Charge for Ba is +2 and charge for O is -2, Here the charges are in equal and opposite so their ratio is 1:1 and hence the formula must be BaO and not
`Ba_2O`.

Rest of the formulas are correct as charge for Ca is +2 and charge for N is -3 . On criss cross we get the formula
`Ca_3N_2` .

Charge for K is +1 and charge for Cl is -1 and so KCl is correct.

Charge for Li is +1 and that for S is -2. On criss cross we get the formula
`Li_2S` .