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option b : O₉S₁₀

Explanation:

There are some points to name a covalent compound, according to that

number of atoms numbered as

**mono for one, di - for two tri for three and so on.

the name of the atom as

**carbon as carbide, sulfur as sulfide, oxygen as oxide, foulrine as flouro etc.

So,

Formula of Nonoxide decasulfide

Now Naming of the Chemical compound

Following are the explanations of  terms

So keeping the above points in mind

The right answer is

Option b : O₉S₁₀