JEE Main Chemistry question
Not in JEE Main or NEET syllabus
If a solid having a ZnS (zinc blende) structure is heated so that the ions along two of the axes passing through the face centre particles are lost, and a bivalent ion enters here to maintain the electrical neutrality, so that the new formula unit becomes , report the value of .
Answer: 7
Solution
In zinc blende, each unit cell normally contains ions in a ccp arrangement (4 per cell: 8 corners + 6 faces ) and ions in alternate tetrahedral voids (4 per cell), so for , unaffected by the change. A cube has 3 axes, each passing through one opposite pair of
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