p - block Elements
Borax on heating strongly above its melting point melts to a liquid, which then solidifies to a transparent mass commonly known as borax-bead. The transparent glassy mass consists of:
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Single Choice
The platinum wire which is used in borax bead test is dipped in:
Apowdered borax
Correct Answer
Bmetaboric acid
Corthoboric acid
Dall
Solution
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.
SIMILAR QUESTIONS
p - block Elements
The metal which does not give any color in the borax bead test is:
p - block Elements
Glassybead is obtained by heating :
p - block Elements
Which of the following compounds is formed in borax bead test?
p - block Elements
Borax-bead test is responded by ?
p - block Elements
Which of the following ions cannot be detected by the borax bead or microcosmic bead test?
p - block Elements
Glassy bead is of
p - block Elements
Blue bead can be of
p - block Elements
The flame used in Borax bead test is:
p - block Elements
Which of the following cations will turn a borax bead green in an oxidising flame?
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