Question

Which formula shows the correct ratio of ions in thecompound formed by each pair of elements? Why?Element Q. Element R 7. Aluminum Sulfur8. Potassium oxygen 9. lithium chloride 10. Strontium. bromine A) QR (B) QR2 (C) QR (D) Q2 R3

Answer 1

7) or A) QR

Al and S => QR = AlS

This is not correct because the Oxidation state of Al is +3 and for S should be -3 too, but S doesn't have a number 3 as oxidation state.

8) or B) QR2=> KO2

It's incorrect, It should be K2O

9) or C) QR => LiCl

This is correct, here the charges are +1 for Li and -1 for Cl

LiCl => Li+1 + Cl-1

10) or D)Q2R3 => Sr2Br3

This isn't correct, Oxidation state for Sr is +2, not +3

Answer: 9) or C) LiCl