Instructions

For each question, enter the correct numerical value (in decimal notation, truncated/rounded-off to the second decimal place; e.g. 6.25, 7.00, -0.33, -.30, 30.27, -127.30) using the mouse and the on-screen virtual numeric keypad in the place designated to enter the answer.

Question 27

Consider an ionic solid MX with NaCl structure. Construct a new structure (Z) whose unit
cell is constructed from the unit cell of MX following the sequential instructions given
below. Neglect the charge balance.
(i) Remove all the anions (X) except the central one
(ii) Replace all the face centered cations (M) by anions (X)
(iii) Remove all the corner cations (M)
(iv) Replace the central anion (X) with cation (M)
The value of $$\left(\frac{number of anions}{number of cations}\right)$$ in Z is ..........

Correct Answer: e

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