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Write reactions to justify amphoteric na...

Write reactions to justify amphoteric nature of aluminium .

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`to` Amphoteric nature means having acidic as well as basic nature.
`to` Aluminium reacts with both mineral acids as well as aqueous alkalis.
a) Reaction with mineral acid :
Al reacts with dil.HCl and liberates hydrogen gas.
`2Al + 6HCl to 2AlCl_3 + 3H_2 uarr`
b) Reaction with aqueous alkali :
`Al` reacts with aqueous alkali (NaOH) and liberates hydrogen gas.
`2Al + 2NaOH + 6H_2 O to Na_2 [Al(OH)_4] + 3H_2 uarr`
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-THE P-BLOCK ELEMENTS GROUP-13-Short Answer Questions
  1. Write reactions to justify amphoteric nature of aluminium .

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  2. What are electron deficient compounds ? Is BCl3 an electron deficient ...

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  3. Suggest reasons why the B-F bonds lengths in BF3 (130 pm) and BF4^- ...

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  4. B-Cl bond has a bond moment. Explain why BCl3 molecule has zero dipole...

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  5. Explain the structure of boric acid.

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  6. What happens when Borax is heated strongly ?

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  7. What happens when Boric acid is added to water ?

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  8. What happens when Aluminium is heated with dilute NaOH ?

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  9. What happens when BF3 is treated with ammonia ?

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

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

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

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

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

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

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

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  17. Explain borax bead test with a suitable example

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  18. Explain the structure of diborane.

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  19. Explain the reactions of aluminium with acids.

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

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