The acidic strength decreases in the order : `HCl gt H_(2)S gt PH_(3)`. Explain.
Or The acidic strength of compounds increases in the order : `PH_(3) lt H_(2)S lt HCl`.

Explanation

To explain the acidic strength of the compounds HCl, H₂S, and PH₃, we can analyze the factors that influence acidity, particularly electronegativity and bond strength.

### Step-by-Step Solution:

1. **Understanding Acidity**:
- Acidity is the ability of a compound to donate a proton (H⁺ ion). The stronger the acid, the more readily it donates H⁺.

2. **Identifying the Compounds**:
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