66. What is electronegativity of Pb in Allred-Rochow scale ? Given Z_{(eff)} of Pb for the valence electron = 5.3 , covalent radius of Pb = 1.53 angstrom.

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_{82} P b

1.53 ˚ A

Find the valency of Pb in PbO

If P (A|B) > P (A), then which of the following is correct:

(A) P (B|A) < P (B) (B) P (A ∩ B) < P (A).P (B)

[1] P b^{2 +} > P b^{4}, S n^{2 +} > S n^{4 +}

[2] P b^{2 +} < P b^{4}, S n^{2 +} < S n^{4 +}

[3] P b^{2 +} > P b^{4}, S n^{2 +} < S n^{4 +}

[4] P b^{2 +} < P b^{4}, S n^{2 +} > S n^{4 +}

[5] S n^{2 +} < P b^{2 +}, S n^{4 +} > P b^{4 +}

[6] S n^{2 +} < P b^{2 +}, S n^{4 +} < P b^{4 +}

χ = \frac{0.359 Z_{e f f}}{r^{2}} + 0.744

χ

r

Z_{e f f}

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