On performing a borax-bead test with a given inorganic mixture for qualitative analysis, the colour of the bead was found to emerald green both in oxidising and reducing flame. It indicates the possibility of the presence of

Options

A. `Co^(+2)`
B. `Ni^(+2)`
C. `Cr^(+3)`
D. `Cu^(+2)`

Explanation

To solve the problem regarding the borax-bead test and the emerald green color observed in both oxidizing and reducing flames, we will follow these steps:

### Step 1: Understand the Borax-Bead Test
The borax-bead test is a qualitative analysis method used to identify certain metal ions based on the color of the bead formed when the metal salt is heated with borax (sodium tetraborate) in a flame.

### Step 2: Analyze the Color Observed
In this case, the bead color observed is emerald green in both oxidizing and reducing flames. This color is significant as it indicates the presence of specific metal ions.

### Step 3: Identify Possible Metal Ions
The emerald green color in the borax bead test is typically associated with the presence of chromium (Cr). Chromium ions can produce this color in both oxidizing and reducing conditions.

### Step 4: Confirm the Presence of Chromium
Since the color remains consistent in both types of flames, it strongly suggests that chromium is present in the inorganic mixture being tested. Other metal ions do not typically display this behavior in the borax-bead test.

### Conclusion
Based on the analysis, the presence of chromium ions in the inorganic mixture is indicated by the emerald green color of the borax bead in both oxidizing and reducing flames.

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