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In the borax test of Co^(2+) , the blue ...

In the borax test of `Co^(2+)` , the blue colour of bead is due to the formation of

A

`B_(2)O_(3)`

B

`Co_(3)B_(2)`

C

`Co(BO_(2))_(2)`

D

`CoO`

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The correct Answer is:
3
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NARAYNA-QUALITATIVE ANALYSIS-LEVEL -III
  1. Which of the following is incoluble in excess of NaOH?

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  2. In the borax test of Co^(2+) , the blue colour of bead is due to the f...

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  3. Mercurous ion is represent as

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  4. The metal ion which is precipitated when H(2)S is passed with HCl is

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  5. Which of the following is not a prelminary test used to detect ions?

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  6. Which of the following metal sulphides has maximum solubility in water...

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  7. The compound formed in the borax bead test of Cu^(2+) ion in oxidising...

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  8. A gas X is passed through water to form a saturated solution. The aque...

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  9. An aqueous solution of a substance gives a white percipitate on treatm...

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  10. Identify the correct order of solubility of Na(2)S,CuS and ZnS in aque...

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  11. When H(2)S gas is passed thorugh the HCl containing aqueous solution o...

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  12. Mark the correct statement

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  13. Potassium chromate solution is added to an aqueous solution of a metal...

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  14. PbCrO(4) is yellow in colour due to

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  15. PbCl(2) is added with 'X' as a result an yellow coloured precipitate '...

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  16. Which of the following can be used to precipitated lead salt

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  17. When cupric sulphate solution is added with 'X' it produced a deep blu...

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  18. Schewitzer's reagent is

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  19. Which of the following is used to oxidise Fe^(+2) to Fe^(+3) in III gr...

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  20. On addition of aqueous NaOH to a salt solution, a white gelatinous pre...

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