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Consider following statements I: If th...

Consider following statements
I: If three `Fe^(2+)` are missing from its lattice site in `FeO`, then there must be two `Fe^(3+)` ions somewhere in the lattice to balance the electrical charges
II : Crystals with metal deficiency defects are called super-conductors
III: Crystals with metal deficiency defects are called semiconductors
The correct statements are 

A

I,II

B

I,III

C

II only

D

I only

Text Solution

Verified by Experts

The correct Answer is:
B
`3Fe^(+2)=2Fe^(+3)` Crystals with metal deficiency acts as semiconductors not super conductors.
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AAKASH SERIES-SOLID STATE-LEVEL - II LECTURE SHEET (EXERCISE - I)
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  2. A non-stoichiometric compound Cu(1.8)S is formed due to incorporation ...

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  3. Consider following statements I: If three Fe^(2+) are missing from i...

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  4. The n-type semiconductor is obtained when Si is doped with

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  5. Superconductors are technologically and commercially important substan...

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  6. When ferromagnetic substances are heated strongly, its magnetic moment

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  7. Silica (SiO(2)) can be crystalline as well as amorphous, with followin...

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  8. In a face centred cubic arrangement of A and B atoms whose A atoms are...

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  9. Which of the following statements are false:

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  10. Edge length of NaCl unit cell is 552 pm. Then which are correct statem...

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  11. Which is true

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  12. A metallic element crystallises into a lattice containing a sequence o...

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  13. In an FCC unit cell atoms are numbered as shown below the atoms not to...

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  14. Ice crystallises in a hexagonal lattice having volume of the unit cell...

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  15. For the structure of solid given below if the lattice points represent...

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  16. A certain solid mixed oxide crystallising in the cubic system contains...

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  17. It is stated that ZnS does not crystallise in the NaCl structure. It i...

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  18. Frenkel defect appears in

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  19. An electron trapped in an anion vacancy within the crystal is called.....

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  20. The presence of F-centres in a crystal makes it

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