Question:

Which set of characteristics of ZnS crystal is correct?

Updated On: Jul 7, 2022

Coordination number (4: 4) ; cep ; $Zn^{2+}$ ions in the alternate tetrahedral voids
Coordination number (6: 6); hep ; $Zn^{2+}$ ions in all tetrahedral voids
Coordination number (6: 4); hep ; $Zn^{2+}$ ions in all octahedral voids
Coordination number (6: 6); hep ; $Zn^{2+}$ ions in all octahedral voids

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The Correct Option is A

Solution and Explanation

ZnS has ccp structure (fee) in which $S^{2-}$ ions occupy comers and face-centres and $Zn^{2+}$ ions are present in alternate tetrahedral voids. Further, each $Zn^{2+}$ ion is surrounded tetrahedrally by $4 \, S^{2-}$ ions and vice-versa.

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Notes on The solid state

Concepts Used:

Solid State

Solids are substances that are featured by a definite shape, volume, and high density. In the solid-state, the composed particles are arranged in several manners. Solid-state, in simple terms, means "no moving parts." Thus solid-state electronic devices are the ones inclusive of solid components that don’t change their position. Solid is a state of matter where the composed particles are arranged close to each other. The composed particles can be either atoms, molecules, or ions.

Types of Solids:

Based on the nature of the order that is present in the arrangement of their constituent particles solids can be divided into two types;

Amorphous solids behave the same as super cool liquids due to the arrangement of constituent particles in short-range order. They are isotropic and have a broad melting point (range is about greater than 5°C).
Crystalline solids have a fixed shape and the constituent particles are arranged in a long-range order.