Which of the following statements is incorrect ?

Options

A. The catalyst used in the hydrogenation of carbo monoxide is a mixture of oxides of zinc and chromium
B. Synthesis gas used to make methanol is a mixture of CO and hydrogen in the ratio 1 : 2 by volume
C. Methanol is used as a fuel in power alcohol
D. Methanol vapours form an explosive mixture with air or oxygen when ignited

Answer

To determine which of the statements is incorrect, let's analyze each option step by step:

### Step 1: Analyze the first statement
**Statement:** The catalyst used in hydrogenation of carbon monoxide is a mixture of oxides of zinc and chromium.

**Analysis:** This statement is correct. The hydrogenation of carbon monoxide to produce methanol indeed involves a catalyst that is a mixture of zinc oxide (ZnO) and chromium oxide (Cr2O3). This is a well-known industrial process.

### Step 2: Analyze the second statement
**Statement:** Synthesis gas used to make methanol is a mixture of carbon monoxide and hydrogen in the ratio of 1:2 by volume.

**Analysis:** This statement is also correct. Synthesis gas (syngas) is primarily composed of carbon monoxide (CO) and hydrogen (H2) in a ratio of 1:2, which is suitable for the production of methanol.

### Step 3: Analyze the third statement
**Statement:** Methanol is used as a fuel in power alcohol.

**Analysis:** This statement is incorrect. Power alcohol is a mixture of absolute ethanol (not methanol) and petrol, typically in a ratio of 20% ethanol to 80% petrol. Therefore, stating that methanol is used as a fuel in power alcohol is incorrect.

### Step 4: Analyze the fourth statement
**Statement:** Methanol vapors form an explosive mixture with air or oxygen when ignited.

**Analysis:** This statement is correct. Methanol can easily vaporize and when its vapors mix with air or oxygen, they can form an explosive mixture that can ignite.

### Conclusion
After analyzing all four statements, the incorrect statement is:
**Methanol is used as a fuel in power alcohol.**

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