The laboratory method of preparation of CO is

Options

A. `HCOOH overset(H_2SO_4)to H_2O + CO`
B. `CO_2 +C to 2CO`
C. `H_2 CO_3 overset("Heat")to H_2O + CO + 1/2 O_2`
D. `2C + O_2 to 2CO`

Explanation

**Step-by-Step Solution:**

1. **Understanding Carbon Monoxide (CO):**
- Carbon monoxide is a colorless, odorless, and poisonous gas. It is important to handle it with care in a laboratory setting.

2. **Identifying the Laboratory Method:**
- One common laboratory method for preparing carbon monoxide involves the dehydration of formic acid (HCOOH) using concentrated sulfuric acid (H2SO4).

3. **Chemical Reaction:**
- The reaction can be represented as:
\[ HCOOH \xrightarrow{H_2SO_4} CO + H_2O \]
- In this reaction, formic acid is dehydrated to produce carbon monoxide and water.

4. **Conditions Required:**
- The reaction is typically carried out by heating the mixture to around 373 Kelvin (100 degrees Celsius). This temperature helps facilitate the reaction.

5. **Collecting the Gas:**
- The carbon monoxide gas produced can be collected by downward displacement of water since it is slightly soluble in water.

**Final Answer:**
The laboratory method for the preparation of carbon monoxide (CO) involves dehydrating formic acid (HCOOH) using concentrated sulfuric acid (H2SO4) at a temperature of around 373 Kelvin.

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