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(A): ABAB ..... pattern of close packing...

(A): ABAB ..... pattern of close packing gives hcp arrangement
(R): In hcp arrangement each sphere is associated with two tetrahedral voids 

A

Both (A) and (R) are true. (R) properly explain (A)

B

Both (A) and (R) are true. (R) does not explain (A)

C

(A) is true. (R) is false

D

(A) is false. (R) is true

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-SOLIDS STATE-PRACTICE EXERCISE
  1. X-rays of wavelength equal to 0.134 nm give a first order diffraction ...

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

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

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

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

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

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

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

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

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

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

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  12. Edge length of a cube is 400 pm. Then its bodydiagonal length would be

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  13. Copper crystallises in fcc with a unit cell length of 361 pm. What is ...

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  14. Ar crystallizes in a F.C.C lattice with one atom at each lattice point...

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  15. Sodium  crystalises in body centred cubic lattice. The edge length of ...

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  16. A metallic element exists in simple cubic structure. Each edge length ...

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  17. At room temperature, Polonium (atomic weight 209 gm mol^(-1)) crystall...

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  18. Iron (alpha-from) crystallises in a body - centred cubic system with e...

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  19. A crystalline solid substance has a density of 10 g//cm^(3) and the le...

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  20. An element crystallises in a structure having a f.c.c unit cell of an ...

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