Home
Class 12
CHEMISTRY
Aluminium reacts with dil. HNO3 but not ...

Aluminium reacts with dil. `HNO_3` but not with conc. `HNO_3`-explain.

Text Solution

Verified by Experts

Conc. Nitric acid oxidises the aluminium to aluminium oxide. This forms as a layer on the surface of the metal which prevents the further reaction. This oxide layer acts as a protective layer . Thus aluminium becomes passive with conc. `HNO_3` and does not react with conc. `HNO_3`.
In dilute `HNO_3` oxide layer on the surface will be dissolved, then the hydrogen liberated from nitric acid reduces it to ammonium nitrate .
Promotional Banner

Topper's Solved these Questions

  • THE P-BLOCK ELEMENTS - GROUP 13

    VGS PUBLICATION-BRILLIANT|Exercise LONG ANSWER QUESTIONS|3 Videos

  • THE P-BLOCK ELEMENTS - GROUP 13

    VGS PUBLICATION-BRILLIANT|Exercise LONG ANSWER QUESTIONS|3 Videos

  • STOICHIOMETRY

    VGS PUBLICATION-BRILLIANT|Exercise ADDITIONAL QUESTIONS & ANSWERS|10 Videos

  • THE p-BLOCK ELEMENTS-GROUP 14

    VGS PUBLICATION-BRILLIANT|Exercise LONG ANSWER QUESTIONS|7 Videos

Similar Questions

Explore conceptually related problems

Though aluminium reacts with dil. HNO_3 why it does not react with conc. HNO_3 ?

Cane sugar reacts with conc. HNO_3 to give :

How does aluminium react with dil. NaOH and fused NaOH?

Zn gives H_2 gas with H_2SO_4 and HCl but not with HNO_3 because

Give equations for all reactions of aluminium metals with dil. HCl conc. HCl dil H_2SO_4 and conc. H_2SO_4 .

Anisole with HNO_3 and conc H_2SO_4 gives

Lassaigne's extract of m-nitrochlorobenzene is acidified with dil. HNO_(3) and then treated with AgNO_(3) solution, the white precipitate formed is due to :

What happens when boron reacts with a) conc. H_(2)SO_(4) b) conc. HNO_(3) c) SiO_(2)

When PbO_(2) reacts with conc. HNO_(3) , the gas evolved is

VGS PUBLICATION-BRILLIANT-THE P-BLOCK ELEMENTS - GROUP 13 -SHORT ANSWER QUESTIONS
  1. What happens when Aluminium is heated with dilute NaOH ?

    Text Solution

    |

  2. What happens when BF3 is treated with ammonia ?

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  10. Explain borax bead test with a suitable example

    Text Solution

    |

  11. Explain the structure of diborane.

    Text Solution

    |

  12. Explain the reactions of aluminium with acids.

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  15. Give two methods of preparation of diborane.

    Text Solution

    |

  16. How does diborane react with H2O ?

    Text Solution

    |

  17. How does diborane react with CO ?

    Text Solution

    |

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

    Text Solution

    |

  19. Al2O3 is amphoteric -explain with suitable reactions.

    Text Solution

    |

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

    Text Solution

    |