`NAHSO_(3) + [X] ("excess") + H_(2)O rarr NaHSO_(4) + HI`
`[X] + Na_(2)S_(2)O_(3) rarr Nal + [Y]`
Identify X and Y ?

Explanation

To solve the problem, we need to identify the substances X and Y in the given reactions. Let's break down the reactions step by step.

### Step 1: Analyze the first reaction
The first reaction is:
\[ \text{NaHSO}_3 + [X] \text{ (excess)} + \text{H}_2\text{O} \rightarrow \text{NaHSO}_4 + \text{HI} \]

Here, we have sodium bisulfite (NaHSO3) reacting with some substance X in the presence of water to produce sodium bisulfate (NaHSO4) and hydrogen iodide (HI).

...