During the borax bead test, a glassy transparent bead is formed which gives characteristic colors with transition metals. The blue bead formed when reacting with copper oxide () is chemically composed

Question

During the borax bead test, a glassy transparent bead is formed which gives characteristic colors with transition metals. The blue bead formed when reacting with copper oxide ($CuO$) is chemically composed of:

Prashant Kotian · Accepted Answer

Correct answer: C. Heating borax yields a glassy bead of sodium metaborate () and boric anhydride (). The basic reacts with the acidic to form Copper(II) metaborate, , which exhibits a distinct blue color.

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