Which of the following oxides give chromic acid in sulphuric acid solutions

Options

A. `CrO`
B. `Cr_(2)O_(3)`
C. `CrO_(3)`
D. `CrO_(2)`

Answer

To determine which of the following oxides gives chromic acid in sulfuric acid solutions, we can follow these steps:

### Step 1: Identify the Relevant Oxides
First, we need to identify the oxides provided in the options. The question does not specify the options, but we will assume they are common chromium oxides such as CrO, Cr2O3, CrO2, and CrO3.

### Step 2: Understand the Reaction with Sulfuric Acid
Chromic acid (H2CrO4) can be formed when certain chromium oxides react with sulfuric acid (H2SO4). We need to focus on the oxide that can produce chromic acid upon reaction with sulfuric acid.

### Step 3: Analyze Each Oxide
1. **CrO (Chromium(I) oxide)**: This oxide does not react with sulfuric acid to produce chromic acid.
2. **Cr2O3 (Chromium(III) oxide)**: This oxide also does not react directly to form chromic acid.
3. **CrO2 (Chromium(IV) oxide)**: This oxide does not yield chromic acid when reacted with sulfuric acid.
4. **CrO3 (Chromium(VI) oxide)**: This oxide reacts with sulfuric acid to produce chromic acid and sulfur trioxide (SO3).

### Step 4: Write the Reaction
The reaction of chromium trioxide (CrO3) with sulfuric acid can be represented as:
\[ \text{CrO}_3 + \text{H}_2\text{SO}_4 \rightarrow \text{H}_2\text{CrO}_4 + \text{SO}_3 \]

### Step 5: Conclusion
From the analysis, we can conclude that the oxide that gives chromic acid in sulfuric acid solutions is **CrO3**.

### Final Answer
The correct option is **CrO3**.

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