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Which of the following is ferromagnetic...

Which of the following is ferromagnetic

A

`Ni`

B

`Co`

C

`CrO_(2)`

D

All

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The correct Answer is:
D
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AAKASH SERIES-SOLID STATE-LEVEL - I (EXERCISE - I)
  1. The limiting radius ratio for tetrahedral shape is

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  2. AB is an ionic solid. If the ratio of ionic radii of A^(+) and B^(+) i...

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  3. For an octahedral arrangement the lowest radius ratio limit is

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  4. (A): Thermodynamically all solids possess a tendency to acquire defect...

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  5. At zero kelvin, most of the ionic crystals possess

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  6. In stoichiometric defects, the ratio of positive and negative ions as ...

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  7. In a solid lattice the cation has left a lattice site and is located a...

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  8. Non stoichiometric solid among the following

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  9. Which of the following has both Schottky and Frenkel defects.

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  10. (A) Schottky and Frenkel defects are also called thermodynamic defects...

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  11. On doping Ge metal with a little of gallium one gets

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  12. A solid with high electrical and thermal conductivity from the followi...

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  13. Which substance will conduct the current in the solid state

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  14. Metals have conductivity in the order of ("ohm"^(-1)" cm"^(-1))

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  15. An example for metallic conductor and semiconductor is

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  16. Moleten sodium chloride conducts electricity due to the presence of

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  17. A diode is

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  18. Which of the following is ferromagnetic

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  19. Ferromagnetic substances have

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  20. Extent of Ferromagnetism is maximum in

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