Arrange the following in the increasing order of acidic strength
(i) `FSO_(3)H` (ii) `HCO_(3)^(-)` (iii) `H_(2)O` (iv) `HSO_(4)^(-)`

Explanation

To arrange the given compounds in increasing order of acidic strength, we will analyze each compound based on their acidic properties.

### Step-by-Step Solution:

1. **Identify the Compounds**: The compounds given are:
- (i) `FSO₃H` (Fluorosulfonic acid)
- (ii) `HCO₃⁻` (Bicarbonate ion)
- (iii) `H₂O` (Water)
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