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Explain borax bead test with a suitable ...

Explain borax bead test with a suitable example

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Borax Bead test. This test is useful for the identification of coloured metal radicals in qualitative analysis . On heating , borax swells into a white , opaque mass of anhydrous sodium tetraborate. When it is fused, borax glass is obtained. This contains sodium metaborate and `B_2O_3`. The boric anhydride combines with metal oxides to from metal metaborates as coloured beads.
The reactions are as follows .
`underset"Borax"(Na_2B_4O_7). 10H_2O to Na_2B_4O_7 overset"fused"to ubrace(2NaBO_2 +B_2O_3 )_("Borax glass ")`
`B_2O_3 +CoO to Co(BO_2)_2`
Cobalt Metaborate (Blue bead)
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VGS PUBLICATION-BRILLIANT-THE P-BLOCK ELEMENTS - GROUP 13 -SHORT ANSWER QUESTIONS
  1. What happens when Aluminium is heated with dilute NaOH ?

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  2. What happens when BF3 is treated with ammonia ?

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  3. What happens when Hydrated alumina is treated with aq.NaOH solution ?

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  4. Give reasons Conc. HNO3 can be transported in aluminium container.

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  5. Give reasons A mixture of dil. NaOH and aluminium pieces in used to...

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  6. Give reasons Aluminium alloys are used to make aircraft body

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  7. Give reasons Aluminium utensils should not be kept in water overnigh...

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  8. Give reasons Aluminium wire is used to make transmission cables .

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  9. Explain why the electronegativity of Ga, In and Tl will not vary very ...

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  10. Explain borax bead test with a suitable example

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  11. Explain the structure of diborane.

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  12. Explain the reactions of aluminium with acids.

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  13. Write a short note on the anomalous behaviour of boron in the group - ...

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  14. Aluminium reacts with dil. HNO3 but not with conc. HNO3-explain.

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  15. Give two methods of preparation of diborane.

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  16. How does diborane react with H2O ?

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  17. How does diborane react with CO ?

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  18. How does diborane react with N(CH3)3 ?

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  19. Al2O3 is amphoteric -explain with suitable reactions.

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  20. Na2B4O7 + Conc. H2SO4 to A underset"(ii) Ignite"overset((i)C2H5OH)to B...

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