`A + CO to CO_(2)`
`B + CO to CO_(2)`
`X + O_(2) to CO_(2)`
A , B & X respectively are

Options

A. `CH_(4)` , Carbon , `Fe_(2) O_(3)`
B. `Fe_(2) O_(3) , ZnO , CH_(4)`
C. `Fe_(2) O_(3) , CH_(4) , ZnO`
D. `HCO OH ` , Carbon , `CH_(4)`

Answer

To solve the problem, we need to identify the substances A, B, and X based on the given chemical reactions. Let's analyze each reaction step by step.

### Step 1: Analyze the Reaction A + CO → CO₂
In this reaction, A reacts with carbon monoxide (CO) to produce carbon dioxide (CO₂). A must be a substance that can react with CO to oxidize it to CO₂. Common candidates for such reactions include metal oxides or metals that can reduce CO.

### Step 2: Analyze the Reaction B + CO → CO₂
Similar to the first reaction, B also reacts with carbon monoxide to produce carbon dioxide. Again, B must be a substance capable of oxidizing CO to CO₂. This suggests that B is likely a reducing agent.

### Step 3: Analyze the Reaction X + O₂ → CO₂
In this reaction, X reacts with oxygen (O₂) to produce carbon dioxide (CO₂). This indicates that X is undergoing combustion, which is typical for hydrocarbons. Therefore, X is likely a hydrocarbon.

### Step 4: Identify X
From the analysis of the third reaction, we conclude that X is a hydrocarbon. The only hydrocarbon among the options provided is CH₄ (methane). Therefore, we can conclude:
- **X = CH₄**

### Step 5: Identify B
In the second reaction, B reacts with CO to produce CO₂. We need to consider the oxidation states involved. Carbon in CO has an oxidation state of +2 and in CO₂ it has an oxidation state of +4. This means that B must be able to reduce CO.

Among the options, ZnO is a metal oxide that can act as a reducing agent. Zinc can be reduced from +2 to 0 oxidation state, making it a suitable candidate for B. Therefore:
- **B = ZnO**

### Step 6: Identify A
Finally, we look at the first reaction. A must be a substance that can react with CO. The only remaining option that fits this description is Fe₂O₃ (iron(III) oxide), which can also react with CO to produce CO₂. Thus, we conclude:
- **A = Fe₂O₃**

### Final Answers:
- A = Fe₂O₃
- B = ZnO
- X = CH₄