Answer:
ii and iv.
Explanation:
i C10H8 can form simplest ratio o that is C5H4, so it is molecular formula and it is wrong.
The same goes to iii Al2Cl6 ......AlCl3
and v. HgCl
If the simplest ratio is one than it shouldn't be written down.
Eg. Hg2Cl2......HgCl
