Q.

The edge length of sodium chloride unit cell is 564 pm. If the size of Cl− ion is 181 pm. The size of Na+ ion will be

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a

101 pm

b

181 pm

c

410 pm

d

202 pm

answer is A.

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Detailed Solution

2r++r-=a2rNa++rCl−=564pmrNa+=5642−181=101pm
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