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Which one of the following statements is...

Which one of the following statements is incorrect about rock salt type ?

A

It has fcc arrangement of `CI^(-)`

B

`Na^(+) and Cl^(-)` ions have a co-ordination number of `6:6`

C

A unit cell of NaCl consists of four Nacil units

D

All halides of alkali metals have rock-salt type structure

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The correct Answer is:
D
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AAKASH SERIES-SOLIDS STATE-PRACTICE EXERCISE
  1. The packing fraction in a simple cubic cell of crystals is :

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  2. A solid AB has NaCl type structure. If the radius of the cation A is 1...

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  3. Which one of the following statements is incorrect about rock salt typ...

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  4. In sodium chloride, Cl^(-) ions form ccp arrangement. In which sites, ...

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  5. The packing fraction in a face - centred cubic cell of crystals is

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  6. A hydrogen bonded molecular crystal among the following:

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  7. The crystal system of a compound with unit cell dimensions a = 0.387, ...

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  8. {:("List - I","List - II"),("(Crystal System)","(Exmaple)"),("A) Ortho...

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  9. Three metals X, Y and Z are crystallised in simple cubic, B. C. C and ...

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  10. X-rays of wavelength equal to 0.134 nm give a first order diffraction ...

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  11. In a diffraction experiment, X-rays of wavelength 0.14 nm were used on...

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  12. (A): ABAB ..... pattern of close packing gives hcp arrangement (R): ...

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  13. In a cubic arrangement of A and B atoms, A atoms are at corners of uni...

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  14. In a hypothetical ionic crystal, B is arranged in cubic close packing ...

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  15. In an ionic crystal, cation "A" occupiesthe  lattice points in a FCC a...

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  16. A solid is made up of two types of atoms "X" and "Y". Atoms of "X" occ...

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  17. (A) : In many crystal structures of ionic substances cations occupy th...

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  18. In a compound oxide ions have CCP arrange ment. Cations A are present ...

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  19. An alloy of Cu, Ag and Au is found to have copper onstituting the CCP ...

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  20. In polonium the total space occupied by the atoms in its crystal latti...

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