The distance between `Na^+` and `Cl^-` ions in NaCl with a density `3.165 g cm^(-3)` is
The distance between `Na^+` and `Cl^-` ions in NaCl with a density `3.165 g cm^(-3)` is
A. 497 pm
B. 248.5 pm
C. 234 pm
D. 538.5 pm
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Correct Answer - B
`d=(ZxxM)/(a^3xxN_A)`
`a^3=(ZxxM)/(d xx N_A)=(4xx58.5)/(3.165xx6.023xx10^23)`
`a^3=122.77xx10^(-24)cm^3`
`a=4.97xx10^(-8)` cm or 497 pm
Distance between `Na^+` and `Cl^(-)=a/2=497/2`=248.5 pm
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