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
Glassy bead is of
A$$B_2O_3 + NaBO_2$$
Correct Answer
B$$NaBO_2 + Na_3BO_3$$
C$$Na_2B_4O_7 + B_2O_3$$
D$$SiO_2 + B_2O_3$$
Solution
If borax, $$Na_{2}B_{4}O.,10H_{2}O$$ is heated on the platinum loop, a transparent colourless glass like bead of sodium metaborate $$(NaBO_{2})$$and boric anhydide $$(B_{2}O_{3})$$
$$Na_{2}B_{4}O_{7}\overset{\Delta }{\rightarrow} 2NaBO_{2}+B_{2}O_{3}$$
So, glassy bead is of $$B_2O_3 \ + \ NaBO_2$$
Hence, Option "A" is the correct answer.
SIMILAR QUESTIONS
p - block Elements
The metal which does not give any color in the borax bead test is:
p - block Elements
The platinum wire which is used in borax bead test is dipped in:
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
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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