`2C+O_(2)rarr2CO, Delta H= - 220 kJ` which of the following statements is correct for this reaction

Options

A. Heat of combustion of carbon is `100 kJ`
B. Reaction is exothermic
C. Reaction needs no initiation
D. All of these are correct

Explanation

To analyze the given reaction and determine which statement is correct, let's break down the information provided step by step.

### Given Reaction:
\[ 2C + O_2 \rightarrow 2CO \]
\[ \Delta H = -220 \, \text{kJ} \]

### Step 1: Understanding the Reaction
The reaction involves the combustion of carbon (C) in the presence of oxygen (O2) to produce carbon monoxide (CO). The negative value of ΔH indicates that the reaction releases heat, which is characteristic of exothermic reactions.

**Hint:** Look for the sign of ΔH to determine if the reaction is exothermic or endothermic.

### Step 2: Analyzing the Enthalpy Change
The enthalpy change (ΔH) of -220 kJ signifies that 220 kJ of energy is released when 2 moles of carbon react with oxygen to form 2 moles of carbon monoxide. This means that the reaction is exothermic.

**Hint:** Remember that a negative ΔH indicates that energy is released to the surroundings.

### Step 3: Evaluating the Statements
Now, let's evaluate the possible statements (A, B, C, D) related to this reaction:

1. **Statement A**: The heat of combustion of carbon is 100 kJ.
- This statement is incorrect because the reaction given is not the complete combustion of carbon. The complete combustion of carbon would produce CO2 instead of CO, and the heat of combustion would be different.

2. **Statement B**: The reaction is exothermic.
- This statement is correct. As discussed, the negative ΔH indicates that the reaction releases heat.

3. **Statement C**: The reaction needs no initiation.
- This statement is incorrect. Even though the reaction is exothermic, it typically requires some form of initiation (like a spark or heat) to start the combustion process.

4. **Statement D**: All of these are correct.
- This statement is incorrect because not all previous statements are correct.

### Conclusion
Based on the analysis, the correct statement for the reaction is:
**B: The reaction is exothermic.**

### Final Answer
The correct option is **B**.