Write the formula of compounds formed by :
(i) `Ag^(+)` and `S^(2-)`
(b) `Cr^(3+)` and `O^(2-)`
( c) `Al^(3+)` and `SO_(4)^(2-)`

Explanation

To write the formulas of the compounds formed by the given ions, we will follow these steps:

### Step 1: Identify the charges of the ions
- For (i) `Ag^(+)` and `S^(2-)`:
- Silver ion (Ag) has a charge of +1.
- Sulfide ion (S) has a charge of -2.

- For (ii) `Cr^(3+)` and `O^(2-)`:
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