Home
Class 12
CHEMISTRY
Heating an ore in the absence of air. be...

Heating an ore in the absence of air. below its melting point is called

A

leaching

B

roasting

C

smelting

D

calcination

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • ELECTROCHEMISTRY

    V PUBLICATION|Exercise QUESTION BANK|154 Videos

  • HALOALKANES AND HALOARENES

    V PUBLICATION|Exercise QUESTION BANK|144 Videos

Similar Questions

Explore conceptually related problems

Assertion : During calcination, the ore is heated well below its melting point in the limited supply of oxygen. Reason: The process of calcination is carried out for sulphide ores. (1) If both (A) and (R) are correct and (R) is the correct explanation of(A). (2) If both (A) and (R) are correct, but (R) is not the correct explanation of (A). (3) If (A) is correct, but (R) is incorrect. (4) If both (A) and (R) are incorrect.

Consider the following metallurgical processes in 1. Heating impure metal with CO and distilling the resulting volatile carbonyl boiling point 43^@C and finally decomposing at 150^@ to 200^@C to get the pure metal. II. Heating the sulphide ore in air until a part is converted to oxide and then further heating in the absence of air to let the oxide react with unchanged sulphide. III. Electrolysing the molten electrolyte containing approximately equal amounts of the metal chloride and CaCl_2 to obtain the metal. The processes used for obtaining sodium, nickel and copper are respectively

In a period, the elements having least melting point are:

Manganese and technetium have very low melting points. Why?

Which one of the following reactions will occur on heating AgNO_(3) above its melting point ?

. Name the metal, with highest melting point?

Stability of a crystal is reflected in the magnitude of its melting points'. Comment. Collect melting points of solid, water, ethyl alcohol, diethyl ether and methane from a data book. What can you say about the intermolecular forces between these molecules?

Look at the following reactions on heating pentane: 1)In the presence of air, 2) In the absence of air. Write the chemical equation for the reactions.

V PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-QUESTION BANK
  1. Silver is obtained from Na [ '.Ag(CN)2]' by reaction with

    Text Solution

    |

  2. Van Arkel method of purification of metals involves converting the met...

    Text Solution

    |

  3. Heating an ore in the absence of air. below its melting point is calle...

    Text Solution

    |

  4. In the froth floatation process for benefication of the ores, the ore ...

    Text Solution

    |

  5. Galena is an ore of

    Text Solution

    |

  6. For which ore of the metal, froth floatation method is used for concen...

    Text Solution

    |

  7. The froth floatation process is based upon

    Text Solution

    |

  8. Which one of the following ores is best concentrated by froth floatati...

    Text Solution

    |

  9. Cassiterite is an ore of

    Text Solution

    |

  10. Cassiterite is concentrated by

    Text Solution

    |

  11. Which of the following metals is extracted by. the electrometallurgica...

    Text Solution

    |

  12. The methods chiefly. used for the extraction of lead and tin from thei...

    Text Solution

    |

  13. In the extraction of Fe from 'Fe2 O3' the reducing agent is

    Text Solution

    |

  14. During the extraction of iron, slag produced is

    Text Solution

    |

  15. The magnetite ore is

    Text Solution

    |

  16. The ore having two different metal atom is

    Text Solution

    |

  17. The most electropositive metals are isolated from their ores by

    Text Solution

    |

  18. Which method of purification is represented by the equations. Ti(s)+2...

    Text Solution

    |

  19. Vapour phase refining of nickel is carried out using

    Text Solution

    |

  20. Mond's process is used for

    Text Solution

    |