Find the oxidation number of the element in bold in the following speices
`(i) SiH_(4), BH_(3),BF_(3),S_(2)O_(3)^(2-),BrO_(4)^(-) "and" HPO_(4)^(2-)
(ii) PbSO_(4),U_(2)O_(7)^(2-),CrO_(4)^(2-), K_(2)MnO_(4)`

Explanation

To find the oxidation number of the specified elements in the given compounds, we will follow a systematic approach. Let's break down the calculations for each species step by step.

### Part (i)

1. **SiH₄ (Silane)**
- Let the oxidation number of Si be \( x \).
- The oxidation number of H is +1.
- The equation becomes:
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