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How many molecules are there in the unit...

How many molecules are there in the unit cell of sodium chioride?

A

2

B

4

C

6

D

8

Text Solution

Verified by Experts

The correct Answer is:
B
In NaCl (rock salt) : Number of `Na^+` ions = 12 ( at edge centres) ` xx 1/4 + 1` ( at body centre ) x 1 = 4 . Number of `Cl^-` ions = 8 (at corners) x `1/8 + 6` (at face centre) ` xx 1/2 = 4 ` Thus, 4 formula unit cell .
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NARAYNA-SOLID STATES-EXERCISE-3
  1. AB crystallizes in a body centred cubic lattice with edge length a equ...

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  2. The total number of octahedral void (s) per atom present in a cubic cl...

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  3. Diamond is an example of .

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  4. The characteristic features of solids are:

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  5. Potassium crystallizes with a

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  6. How many molecules are there in the unit cell of sodium chioride?

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  7. Crystals can be classified into ….basic crystal habits

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  8. Tetragonal crystal system has the unit cell dimensions:

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  9. Which of the following is an example of covalent crystal solid?

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  10. Amorphous substances show (A) short and long range order (B) short ...

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  11. The property of crystalline solid is not

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  12. Which of the following is an amorphous solid

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  13. Which of the following is ferroelectric compound?

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  14. If a is the length of the side of a cube, the distance between the bod...

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  15. A given metal crystalline out with a cubic structure having edge leng...

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  16. The vacant space in bcc lattice unit cell is

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  17. The correct statement regarding defects in crystalling solids.

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  18. In calcium, fluoride having the florite structures. The coordination n...

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  19. Lithium has a bcc structure .Its density is 530 kg m^(-3) and its atom...

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  20. The ionic radii of A^(+) and B^(-) ions are 0.98 xx 10^(-10) and 1.81 ...

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