InterviewSolution
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InterviewSolution
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Select right expression for determinig packing fraction (P.F.) of NaCl unit cell (assume ideal ) , if ions along an edge diagonal are absent :A. `P.F = ((4)/(3) pi(r_(+)^(3) + r_(-)^(3)))/(16sqrt2 r^(3))`B. `P.F = ((4)/(3) pi [(5)/(2) r_(+)^(3) + r_(-)^(3)])/(16 sqrt2 r_(-)^(3))`C. `P.F = ((4)/(3) pi [(5)/(2) r_(+)^(3) + r_(-)^(3)])/(16 sqrt2 r_(-)^(3))`D. `P.F = ((4)/(3) pi [(7)/(2) r_(+)^(3) + r_(-)^(3)])/(16 sqrt2 r_(-)^(3))` |
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Answer» Correct Answer - B Effective no. of `Na^(+)=4-(1+2xx(1)/(4))=(5)/(2)` Effective no. of `Cl^(-)=4sqrt(2)a=4r^(-)` P.F, `=("Vol. of effective no. of cations and anions")/("Vol. of unit cell")` |
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