Question

In rock salt crystal, all ions present in one of tetrad axis are removed, then the hypothetical formula of crystal is
(A) Na3Cl2 (B) Nacl(C) Na2C13 (D) Na3Cl4
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Answer 1

Correct option is

A

Na

7

Cl

8

In NaCl structure Na

+

ion will occupy the tetrahedral voids while the Cl

−

ion will occupy the FCC lattice

At the corners =

2

1

×6=3

And at the octahedral body diagonal =1

Total number of octahedral voids in FCC lattice is =4

Thus, if the Na

+

ion is lost from one of the corner then the total number of Na

+

ion =

2

1

(6−1)+1=

2

7

And Number of Cl

−

ions =4

Therefore the formula is Na

7

Cl

8

Answer 2

Answer:

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