The oxidation state of hydrogen in `CaH_(2)` is +1.

Answer

To determine the oxidation state of hydrogen in calcium hydride (CaH₂), we can follow these steps:

### Step 1: Identify the compound
We start with the compound CaH₂, which is known as calcium hydride.

### Step 2: Determine the oxidation state of calcium
Calcium (Ca) is an alkaline earth metal, and it typically has an oxidation state of +2. This is because it tends to lose two electrons to achieve a stable electron configuration.

### Step 3: Set up the equation for oxidation states
Let the oxidation state of hydrogen be denoted as \( x \). Since there are two hydrogen atoms in CaH₂, the total contribution from hydrogen will be \( 2x \).

### Step 4: Write the equation for the overall charge
The compound CaH₂ is neutral, meaning the sum of the oxidation states must equal zero. Therefore, we can set up the equation:
\[ \text{Oxidation state of Ca} + \text{Oxidation state of H} = 0 \]
Substituting the known values, we have:
\[ +2 + 2x = 0 \]

### Step 5: Solve for \( x \)
Now, we can solve for \( x \):
\[ 2x = -2 \]
\[ x = -1 \]

### Step 6: Conclusion
The oxidation state of hydrogen in CaH₂ is -1.

### Final Answer
Thus, the statement that the oxidation state of hydrogen in CaH₂ is +1 is **false**. The correct oxidation state of hydrogen in calcium hydride is -1.

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