JEE Main Chemistry question
Not in JEE Main or NEET syllabus
Consider an ionic solid with structure. Carry out the following sequential instructions to construct a new structure from the unit cell of (neglect charge balance): (i) Remove all the anions () except the central one. (ii) Replace all face-centred cations () by anions (). (iii) Replace the central anion () with a cation (). The value of in a unit cell of is .
Answer: 1.5
Solution
Take (anion) at the body centre + 12 edge centres ( total) and (cation) at the 8 corners + 6 face centres ( total). (i) Removing all anions except the central one leaves 1 anion (body centre), 4 cations unchanged. (ii) Converting the 3
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