Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • Please help! In ZnS crystal , S2- occupy all corners and face centres while Zn2+ occupy alternate tetrahedral voids. If sum of radius of Zn2+ and S2- ion is 280 pm then the edge length of unit cell is

In ZnS crystal , S2- occupy all corners and face centres while Zn2+ occupy alternate tetrahedral voids. If sum of radius of Zn2+ and S2- ion is 280 pm then the edge length of unit cell is

  • Option 1)

    342.8 pm

  • Option 2)

    646.6 pm

  • Option 3)

    280 pm

  • Option 4)

    121.2 pm

 

Answers (2)

Edge\; length=\frac{4}{\sqrt{3}}\left ( r_{Zm^{2+}} +r_{s^{2-}}\right )

                            =\frac{4}{\sqrt{3}}\left ( 280 \right )=646.6pm

 

 

Zinc blende structure (ZnS) -

{S^{2-} arrange in CCP

 

{Zn^{2+} found in 50% tetrahedral voids

 

Edge length = \frac{4}{\sqrt{3}} (r_{Zn^{2+}} + r_{S^{2-}})

 

Coordination number = 4:4

- wherein

Number or {S^{2-} = 4

Number of {Zn^{2+} = 4

Number of ZnS molecule per unit cell = 4

Example = AgCl , AgBr , CuCl , CuBr , etc

 

 


Option 1)

342.8 pm

This is incorrect

Option 2)

646.6 pm

This is correct

Option 3)

280 pm

This is incorrect

Option 4)

121.2 pm

This is incorrect

Posted by

subam

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

q

Posted by

Manoj Kumar

View full answer

Similar Questions

Trending Articles/News

anam-khan

JEE Main 2024 Topper: Farmer’s son Gajare Nilkrishna says ‘keep questioning until you understand’
anam-khan

NIT Puducherry Cut-off 2024: Computer Science and Engineering had highest closing rank last year
anam-khan

JEE Mains: Farmer's son from remote Maharashtra village aces exam

Latest Question