If the positions of Na^+ and Cl^- are interchanged in NaCl, the crystal lattice with respect to Na^+ and Cl^- is:

JEE Main Chemistry question

Not in JEE Main or NEET syllabus

If the positions of and are interchanged in , the crystal lattice with respect to and is:

(A)Both fccCorrect
(B)Both bcc
(C)Fcc and bcc
(D)Bcc and fcc

Answer: (A)

Solution

In , the ions occupy an fcc lattice (corners + face centres), while the ions occupy all the octahedral voids of that lattice (edge centres + body centre); checking the coordinates shows this second set of points is itself congruent to an fcc lattice, merely translated by half an edge length

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Question ID VK-141731