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Why no visible reaction occurs when alum...

Why no visible reaction occurs when aluminium is left in contact with concentrated nitric acid?

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Aluminium is a reactive metal and initially reacts with con. `HNO_(3)` to form `Al_(2)O_(3)`. The oxide forms a protective coating on the surface of the metal and it becomes passive, Therefore, no visible reaction is noticed in this case.
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DINESH PUBLICATION-P BLOCK ELEMENTS (GROUP 13 AND 14 )-Concept based
  1. Hallides of boron and aluminium are Lewis Acids. Assign reason.

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  2. Anhydrous AlCl(3) is covalent but hydrated AlCl(3) is electrovalent. ...

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  3. Why no visible reaction occurs when aluminium is left in contact with ...

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  4. Aluminium metal is frequently used as a reducing agent for the extract...

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  5. Why B-X bond distance in BX(3) is shorter than theoretically expected ...

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  6. Aluminium is a highly electropositive metal but it find extensive use ...

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  7. Elemental silicon does not form a graphtie like structure. Explain.

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  8. C Cl(4) does not act a Lewis acid while SiCl(4) behaves as a Lewis aci...

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  9. Why is C Cl(4) used in fire extinguishers while CS(2) cannot be used?

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  10. Stannous chloride and ferric chloride cannot be kept in the same cont...

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  11. How is lithium aluminium hydride prepared? What is its important use?

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  12. What are methanides? Whichg as do they liberate on hydrolysis?

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  13. Why is+2oxidiation state of lead more stable than +4 oxidation state?

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  14. Diagonal Relationship Between Beryllium And Aluminium

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  15. White fumes appear around the bottle of anhydrous aluminium chloride. ...

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  16. Boron is unable to form BF(6)^(3-)– ion. Explain.

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  17. Why is boric acid considered as a weak acid ?

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  18. In elements of group 14. (a) which forms the most acidic oxide (b)...

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  19. [SiF(6)]^(2-) is a well known compound but [SiCl(6)[^(2-) is not. Expl...

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  20. Diamond is covalent, yet it has high melting point. Why ?

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