Home
Class 12
CHEMISTRY
(A): High purity gallium for semiconduct...

(A): High purity gallium for semiconducting purpose can be obtained by zone refining
(R): Zone refining works on the principle of fractional crystallisation, leading to high purity

A

Both A & R are true, R is the correct explanation of A

B

Both A & R are true, R is not correct explanation of A

C

A is true, R is false

D

A is false, R is true

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • PRINCIPLES OF METALLURGY

    AAKASH SERIES|Exercise OBJECTIVE EXERCISE-2|45 Videos

  • PRINCIPLES OF METALLURGY

    AAKASH SERIES|Exercise PRACTICE EXERCISE|84 Videos

  • PRINCIPLES OF METALLURGY

    AAKASH SERIES|Exercise SUBJECTIVE EXERCISE-4 ( VERY SHORT ANSWER QUESTIONS )|18 Videos

  • PRACTICAL CHEMISTRY

    AAKASH SERIES|Exercise PRACTICE SHEET-5 (Integer answer Type questions)|6 Videos

  • PROTEINS AND NUCLEIC ACIDS

    AAKASH SERIES|Exercise PRACTICE SHEET - 4|30 Videos

Similar Questions

Explore conceptually related problems

What is Zone refining ? Describe the principle involved in the purification of the metal by this method.

Which of the following statements are correct related to metallurgy? (A) In electrolytic refining of copper, pure Cu is used as anode. (B) Zone refining is based on the principle that impurities are more soluble in the melt than in the solid state of the metal. (C) (C) TiI_4 upon heating will give pure Ti. (D) Very pure Zr may be obtained by galvanisation (E) In copper smelting, hot air is used to convert to CuSO_4 The correct answer is

Outline the principles of refining of metals by the following methods. zone refining

Outline the principles of refining of metals by the following methods. (a)Zone refining (b) Electrolytic refining (c) poling (d) Vapour phase refining.

In electrolytic fefining of cooper, pure Cu os used as anode. (B) Zone refining is based on the principle that impurities are more solutble in the melt than in the solid states of the metal. (D) Very pure Zr may be obtained by Galvanisation. (E) In copper smelting hot air is used to convery Cu_(2) S to CuSO_(4).

(A): Zinc can be refined from lead by distillation (R): Vapour pressure of lead is more compared to that of zinc

Silicon crystallises in fcc lattice, a single crystal of high purity like diamond. Gram atomic weight of silicon is 28 g mol^(-1) . Edge length of unit cell is 0.543nm. Calculate the number of silicon atoms per unit cell and density of unit cell.

Silicon crystallises in foc lattice, a single crystal of high purity like diamond. Gram atomic weight of silicon is 28 g mol^(-) . Edge length of unit cell is 0.543nm. Calculate the number of silicon atoms per unit cell and density of unit cell.

AAKASH SERIES-PRINCIPLES OF METALLURGY-OBJECTIVE EXERCISE-1
  1. (A): Hydrated oxides are usually subjected to roasting (R) : Hydrate...

    Text Solution

    |

  2. (A): Levigation is used for the separation of oxide ores from impuriti...

    Text Solution

    |

  3. (A): High purity gallium for semiconducting purpose can be obtained by...

    Text Solution

    |

  4. (A): Copper metal can be extracted by electrolysis even from aqueous s...

    Text Solution

    |

  5. (A): Last traces of lead from silver is removed by cupellation (R): ...

    Text Solution

    |

  6. (A): Zinc can be refined from lead by distillation (R): Vapour press...

    Text Solution

    |

  7. (A): Metals like Sn and Pb can be refined by liquation (R) : Sn and ...

    Text Solution

    |

  8. (A): Mond's process is used to refine nickel metal (R) : With carbon...

    Text Solution

    |

  9. (A): Corrosion involves the oxidation of metal (R): Oxidised form of...

    Text Solution

    |

  10. (A): Silver cyanide complex is treated with zinc to precipitate silver...

    Text Solution

    |

  11. (A): In aluminothermic process, Al reduction increases the heat of the...

    Text Solution

    |

  12. (A) : Sulphide ores are concentrated by froth floatation process. (R...

    Text Solution

    |

  13. (A): Platinum and gold occur in native state in nature. (R): Platinu...

    Text Solution

    |

  14. (A): Graphite is an example of neutral refractory material used in fur...

    Text Solution

    |

  15. Which of the following is true ?

    Text Solution

    |

  16. Which of the following is not found in native state ?

    Text Solution

    |

  17. Cassiterite ore is used to extract

    Text Solution

    |

  18. The metal never found in free state is

    Text Solution

    |

  19. Both calcination and roasting can be performed in

    Text Solution

    |

  20. Copper pyrites ore is concentrated by

    Text Solution

    |