Give an example of a compound in which hydrogen exists in (a) `+1`, (b) `-1`,

Explanation

To solve the question of providing examples of compounds where hydrogen exists in the oxidation states of +1 and -1, we can follow these steps:

### Step 1: Identify a compound where hydrogen has an oxidation state of +1.
- **Example**: Hydrochloric acid (HCl).
- In HCl, hydrogen is bonded to chlorine, which is more electronegative. The oxidation state of hydrogen in this compound is +1.

### Step 2: Calculate the oxidation state of hydrogen in HCl.
- The oxidation state of chlorine (Cl) is -1.
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