Question

Assertion. Zinc blende and wurtzite both have fcc arrangement of sulphide ions.
Reason. A unit cell of both has four formula units of ZnS.

Answer 1

Correct Answer - d
Correct R. Zinc blende has fcc arrangement of `S^(2-)` ions while wurtzite has hexagonal, close packing arrangement of `S^(2-)` ions.
Correct R. A unit cell of zine blende has 4 formula unit while that of wurzite has 6 formula units of ZnS.