During the borax bead test, a transparent glassy bead is formed, which gives characteristic colors with transition metals. The blue bead formed with is chemically:

Question

During the borax bead test, a transparent glassy bead is formed, which gives characteristic colors with transition metals. The blue bead formed with $Co^{2+}$ is chemically:

Prashant Kotian · Accepted Answer

Correct answer: B. Heating borax produces a glassy bead of sodium metaborate () and boric anhydride (). The basic metal oxide reacts with acidic to form a colored metal metaborate. For Cobalt, it forms , which is blue.

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