JEE Advanced Model Paper 17 with solutions for online practice

Cation : X+ : Tetrahedral void.
Anion : Y− : CCP
Distance between cation and anion = rcation + ranion = 90 + 400 = 490 pm
rcation = 0.225 ranion = 0.225 × 400 = 90 pm
a

√3

4

= 490 ⇒ a =

1960

√3

pm
Minimum distance between two cation =

a

2

=

1960

2×√3

=

980

√3

pm
Maximum distance between two cation = a

√3

2

=

1960

√3

=

√3

2

= 980 pm
Fraction of edge occupied by particle =

2×rp

a

=

2×400

1960

× √3 = 0.707