Solid State - Result Question 19

####19. A compound MpXq has cubic close packing (ccp) arrangement of X. Its unit cell structure is shown below. The empirical formula of the compound, is

(2012)

(a) MX

(b) MX2

(c) M2X

(d) M5X14

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Answer:

Correct Answer: 19. (b)

Solution:

  1. Contribution of atom from the edge centre is 1/4. Therefore, number of

M=14×4 (from edge centre) +1 (from body centre) =2

Number of X=18×8 (from corners) +12×6

Empirical formula =M2X4=MX2

( from face centre )=4



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