Home
Class 12
CHEMISTRY
Borax Bead Test is carried out when the ...

Borax Bead Test is carried out when the original mixture is coloured. It is done with the help of a cleam platinum wire on which a small loop is made at the end. When borax is heated on platinum wire loop transparent glass like bead is obtained. The hot bead is brought in contact with salt till it reacts with fused borax and colour is imparted to the bead. bead colour is noted.
`{:("Colour of the bead","Ion"),(1." Blue green",Cu^(2+)),(2." Yellow ",Fe^(3+)),(3." Green",Cr^(3+)),(4." Violet",Mn^(2+)),(5." Dark blue",Co^(2+)),(6." Brown",Ni^(2+)):}`
Q. Glassy bead of :

A

sodium tetraborate

B

sodium metaborate

C

sodium metabarate and boric anhydride

D

sodium tetraborate and boric anhydride

Text Solution

Verified by Experts

The correct Answer is:
C
`Na_(2)B_(4)O_(7). 10H_(2)O overset("Heat") to Na_(2)B_(4)O_(7)+10H_(2)O`
`Na_(2)B_(4)O_(7)to underset("Glassy bead")(ubrace(2NaBO_(2)+B_(2)O_(3)))`
Promotional Banner

Similar Questions

Explore conceptually related problems

Borax Bead Test is carried out when the original mixture is coloured. It is done with the help of a cleam platinum wire on which a small loop is made at the end. When borax is heated on platinum wire loop transparent glass like bead is obtained. The hot bead is brought in contact with salt till it reacts with fused borax and colour is imparted to the bead. bead colour is noted. {:("Colour of the bead","Ion"),(1." Blue green",Cu^(2+)),(2." Yellow ",Fe^(3+)),(3." Green",Cr^(3+)),(4." Violet",Mn^(2+)),(5." Dark blue",Co^(2+)),(6." Brown",Ni^(2+)):} Q. The flame used in Borax Bead Test is:

Borax Bead Test is carried out when the original mixture is coloured. It is done with the help of a cleam platinum wire on which a small loop is made at the end. When borax is heated on platinum wire loop transparent glass like bead is obtained. The hot bead is brought in contact with salt till it reacts with fused borax and colour is imparted to the bead. bead colour is noted. {:("Colour of the bead","Ion"),(1." Blue green",Cu^(2+)),(2." Yellow ",Fe^(3+)),(3." Green",Cr^(3+)),(4." Violet",Mn^(2+)),(5." Dark blue",Co^(2+)),(6." Brown",Ni^(2+)):} Q. Blue bead can be of:

Borax bead test is used to identify the

Borax bead test is given by:

Borax bead test is based upon the formation of

Borax bead test is given by :