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KCl crystallises in the same type of lattice as does NaCl. Given that

r Na +     /  r Cl –  = 0.55  and r  k+      / r Cl–   = 0. 74. Calculate the ratio of the side of the unit cell for KCl to that of NaCl

a. 1.123

b. 0.891

c. 1.414

d. o.414

e. 1.732

Ans. c

(8)

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