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Which of the following order is wrong ?

$ (a)\;NH_3 < PH_3 < ASH_3 \;-acidic \\(b)\;li < Be < B < C -(IE), \\ (c)\;Al_2O_3 > MgO < Na_2O < K_2 O \\ (d)\;Li^{+} < Na^+ < K^+ -Cos^+ -ionic\; value $

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Wrong order is $li < Be < B < C -(IE)$
Hence b is the correct answer.
answered Mar 6, 2014 by meena.p
 

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