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On dipping a loop of platinum wire in bo...

On dipping a loop of platinum wire in borax paste and heating the wire subsequently in hot oxidising flame, produces a colourless, transparent, glass-like bead. The bead contains:

A

`H_(3)BO_(5)`

B

`NaBO_(2)`

C

`B_(2)O_(3)`

D

`Na_(2)B_(4)O_(7)`

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The correct Answer is:
B, C
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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. 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. 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. Blue bead can be of:

State with equations what happens when borax is heated on a platinum wire Ioop and to the resulting transparent mass, a minute amount of CuO is added and the mixture is again heated first in the oxidising flame and then in the reducing flame of a Bunsen burner?

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 ?

What happen when a mixture of cobalt oxide and borax is heated in a flame on a loop of platinum wire?

GRB PUBLICATION-SALT ANALYSIS-Multiple Objective Type
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  2. Which of the following anionic radicals give white precipitate with ma...

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  3. Which of the following compounds give white ppt. with dil. HCI?

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  4. Which of the following compound(s) give yellow precipitate with BaCI(2...

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  5. Which of the following compound(s) reduces chromates and dichromates?

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  6. On dipping a loop of platinum wire in borax paste and heating the wire...

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  7. Which of the following compound(s) give white precipitate with silver ...

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  8. An aqueous solution of a substance gives a white precipitate on treatm...

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  9. Which of the following compound(s) gives brownish-black precipitate, o...

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  10. Select the correct statement(s):

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  11. Which of the following reagents give white precipitate with MgSO(4) so...

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  12. Which of the following reactions is/are represented correctly?

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  13. Given are the following observation: The correct statement is/are...

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  14. HgS is insoluble in:

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  15. Which of the following ppt. is soluble in both aqua regia and sodium d...

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  16. Which of the following compound(s) give precipitate of its basic salt ...

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  17. Soluble complex of 'R' Compound 'P' may be:

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  18. Which of the following reaction(s) give(s) blue precipitate?

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  19. Which of the following pair of species can be separated by dil. HCI?

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  20. In which reaction(s) blood red colouration is observed in product:

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