The colour of ferric metaborate is

Options

A. Yellow
B. Blue
C. Green
D. Grey

Answer

To determine the color of ferric metaborate, we can follow these steps:

### Step 1: Understand the Composition
Ferric metaborate is a compound that contains iron (Fe) in its ferric state (Fe³⁺) and the metaborate ion (BO₂⁻).

**Hint:** Look for the oxidation state of the metal in the compound to understand its properties.

### Step 2: Reference the Borax Bead Test
The color of metal metaborates can be determined using the borax bead test. This test involves heating a mixture of borax and the metal compound to observe the color produced.

**Hint:** Recall that the borax bead test is a common method used to identify metal ions based on the color they produce.

### Step 3: Identify the Color for Ferric Ion
For ferric ions (Fe³⁺), the borax bead test typically produces a yellow color. This is a characteristic color associated with iron in its ferric state.

**Hint:** Remember that different metal ions can produce different colors in the borax bead test, so it's important to know the specific color for each ion.

### Step 4: Conclusion
Since the question specifically asks for the color of ferric metaborate, and we established that ferric ions produce a yellow color in the borax bead test, we conclude that the color of ferric metaborate is yellow.

**Final Answer:** The color of ferric metaborate is yellow.

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