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A glassy bead formed by heating borax on...

A glassy bead formed by heating borax on a platinum wire loop is

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_4O_(7).10H_(2)O overset("Heat")rarrNa_(2)B_(4)O_(7)+10H_2O`
`Na_(2)B_(4)O_(7) rarr ubrace(2NaBO_2 + B_2O_3)_("Glassy bead")`
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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 :

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 :

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:

State with equations what happens when borax is heated on a platinum wire loop and to resulting transparent mass, a mixture amount of CuO is added and the mixture is again heated. (a) First in the oxidising flame and (b) Then in the reducing flame of a Bunsen burner ?

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:

What is borax bead mixture ?

i.(A) overset(Delta)to glassy traparent beat (B) on platinum wire (B) + CuSO_(4) rarr coloured bead(C ) ii underset((D))((A))+conc. H_(2)SO_(4)+CH_(3)CH_(2)OH overset("ignite")rarr green flame iv.Aqueous solution (A) is alkline Identify (B) .

i.(A) overset(Delta)to glassy traparent beat (B) on platinum wire (B) + CuSO_(4) rarr coloured bead(C ) ii underset((D))((A))+conc. H_(2)SO_(4)+CH_(3)CH_(2)OH overset("ignite")rarr green flame iv.Aqueous solution (A) is alkline Identify A .

i.(A) overset(Delta)to glassy traparent beat (B) on platinum wire (B) + CuSO_(4) rarr coloured bead(C ) ii underset((D))((A))+conc. H_(2)SO_(4)+CH_(3)CH_(2)OH overset("ignite")rarr green flame iv.Aqueous solution (A) is alkline Identify AC.

i.(A) overset(Delta)to glassy traparent beat (B) on platinum wire (B) + CuSO_(4) rarr coloured bead(C ) ii underset((D))((A))+conc. H_(2)SO_(4)+CH_(3)CH_(2)OH overset("ignite")rarr green flame iv.Aqueous solution (A) is alkline Identify D.