Which of the following statements correct?

Options

A. 28 g of CO contains 12 g and 16g oxygen
B. One mole of CO reacts completely with half mole of `O_(2)` to form 1 mole of `CO_(2)`
C. `N_(2)` and `CO` have same molar mass
D. All of these

Answer

To determine which statements are correct regarding carbon monoxide (CO), we will analyze each statement step by step.

### Step 1: Analyze Statement 1
**Statement 1:** 28 gm of carbon monoxide (CO) contains 12 gm of carbon and 16 gm of oxygen.

- **Molecular Weight of CO:**
- Carbon (C) has an atomic weight of 12 gm.
- Oxygen (O) has an atomic weight of 16 gm.
- Therefore, the molecular weight of CO = 12 gm (C) + 16 gm (O) = 28 gm.

- **Conclusion for Statement 1:**
- Since 28 gm of CO consists of 12 gm of carbon and 16 gm of oxygen, this statement is correct.

### Step 2: Analyze Statement 2
**Statement 2:** 1 mole of CO reacts completely with 0.5 mole of O2 to form 1 mole of CO2.

- **Balanced Reaction:**
- The reaction can be written as:
\[ \text{CO} + \text{O}_2 \rightarrow \text{CO}_2 \]
- To balance the reaction:
- On the left side, we have 1 carbon atom and 2 oxygen atoms (from O2).
- On the right side, we have 1 carbon atom and 2 oxygen atoms (from CO2).
- Thus, the balanced equation is:
\[ \text{2 CO} + \text{O}_2 \rightarrow \text{2 CO}_2 \]
- From this, we can see that 1 mole of CO reacts with 0.5 mole of O2 to produce 1 mole of CO2.

- **Conclusion for Statement 2:**
- This statement is also correct.

### Step 3: Analyze Statement 3
**Statement 3:** Nitrogen (N2) and CO have the same molar mass.

- **Molecular Weight of N2:**
- The atomic weight of nitrogen (N) is 14 gm.
- Therefore, the molecular weight of di-nitrogen (N2) = 14 gm × 2 = 28 gm.

- **Molecular Weight of CO:**
- As calculated earlier, the molecular weight of CO = 28 gm.

- **Conclusion for Statement 3:**
- Since both N2 and CO have a molecular weight of 28 gm, this statement is correct.

### Final Conclusion
All three statements are correct. Therefore, the answer is:
**Option D:** All statements are correct.

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