RbCl has same type of lattice as NaCl. The radius of rNa+/Cl− and rRb+/Cl−is 0.55 and 0.74 respectively. The ratio of the side of unit cell for RbCl to that of NaCl is ______.

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answer is 1.12.

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Detailed Solution

rNa+/Cl−=0.55 and rRb+/Cl−=0.74 or rNa+rCl−+1=0.55+1 and rRb+rCl-+1=0.74+1rNa++rCl−rCl−=1.55 and rRb++rCl−rCl-=1.74rRb++rCI-rNa++rCI-=1.741.55=1.12

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