Home
Class 14
GENERAL KNOWLEDGE
Sapphire and ruby are varieties of natur...

Sapphire and ruby are varieties of natural:

A

aluminium sulphide

B

aluminium hydroxide

C

aluminium carbonate

D

aluminium oxide

Text Solution

Verified by Experts

The correct Answer is:
D
Sapphire and ruby are varieties of natural aluminium oxide. Aluminium forms one stable oxide, known by its mineral name corundum ( corundum is a crystalline form of aluminium oxide `(Al_2O_3)`.Sapphire and ruby are impure corundum contaminated with trace amounts of other metals.
Promotional Banner

Topper's Solved these Questions

  • CHEMISTRY

    PINNACLE|Exercise COMMON NAME |15 Videos

  • BIOLOGY

    PINNACLE|Exercise MISCELLANEOUS|44 Videos

  • CURRENT AFFAIRS

    PINNACLE|Exercise SCHEMES & PROJECTS|40 Videos

Similar Questions

Explore conceptually related problems

Main varieties of potato are

Best varieties of sugarbeet are

The wheat varieties are:

An improved variety is

Sonalika and Kalyan sona are the varieties of

PINNACLE-CHEMISTRY-MISCELLANEOUS
  1. Rusting of iron is an example of

    Text Solution

    |

  2. After going through the processes of scouring and bleaching, 99% of co...

    Text Solution

    |

  3. is one of the liquids commonly used in liquid-in-glass thermometers.

    Text Solution

    |

  4. Which of the following fuels has calorific value equal to petrol?

    Text Solution

    |

  5. Sapphire and ruby are varieties of natural:

    Text Solution

    |

  6. Which among the following combinations is present in higher amount in ...

    Text Solution

    |

  7. Heavy water is used as moderator in a nuclear reactor. The function of...

    Text Solution

    |

  8. Which acid makes the atmosphere of venus have thick white and yellowis...

    Text Solution

    |

  9. Which of the following can be used as a catalyst in Hydrogenation reac...

    Text Solution

    |

  10. Which of the following is used to remove the green colour from glass?

    Text Solution

    |

  11. Which of the following is used for removing permanent hardness of wate...

    Text Solution

    |

  12. Name the densest stable element known on earth.

    Text Solution

    |

  13. In which process is a protective zinc coating applied on iron to preve...

    Text Solution

    |

  14. NPK is a :

    Text Solution

    |

  15. is the inflammatory compound in pepper spray.

    Text Solution

    |

  16. Iron nails become after being dipped in copper sulphate solution.

    Text Solution

    |

  17. What is the number of hydrogen atoms in a molecule of calcium bicarbon...

    Text Solution

    |

  18. What is the meaning of the Greek origin word, 'Elektron'?

    Text Solution

    |

  19. In a galvanic cell, the half-cell in which oxidation takes place is ca...

    Text Solution

    |

  20. solids are formed by the three-dimensional arrangements of cations and...

    Text Solution

    |