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Question

The platinum wire which is used in borax bead test is dipped in:

A
powdered borax
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B
metaboric acid
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C
orthoboric acid
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D
all
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Solution

The correct option is A powdered borax
The borax bead test is the most common. A small loop is formed at the end of a platinum wire. The loop is cleaned with concentrated hydrochloric acid and dipped in powdered borax, then heated in the flame of a Bunsen burner until the borax melts, forming a bead.

The powdered borax when heated gives a glassy bead.

The glassy bead is dipped in metal oxide and heated to get the characteristic bead color.

Option A is correct.

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