Which of the following reaction is endothermic?

Options

A. `CaCO_(3) rarr CaO +CO_(2)`
B. `Fe +S rarr FeS`
C. `NaOH +HCI rarr NaCI +H_(2)O`
D. `CH_(4)+2O_(2) rarr CO_(2) +2H_(2)O`

Explanation

To determine which of the following reactions is endothermic, we need to analyze each reaction based on the energy changes involved. An endothermic reaction is characterized by the absorption of heat, resulting in a positive change in enthalpy (ΔH > 0), while an exothermic reaction releases heat (ΔH < 0).

### Step-by-Step Solution:

1. **Understand Endothermic Reactions**:
- An endothermic reaction absorbs energy from its surroundings. This means that the energy required to break the bonds in the reactants is greater than the energy released when new bonds are formed in the products.

2. **Analyze Each Reaction**:
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