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Q.

Which of the following order is wrong?

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a

NH3 < PH3 < AsH3 - Acidic

b

Li < Be < B < C - 1st ionisation potential

c

Al2O3 < MgO < Na2O < K2O - Basic

d

Li+ < Na+ < K+ < Cs+ - ionic radius

answer is B.

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Detailed Solution

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The right order of ionization potential of Li, Be, B and C is C>Be>B>Li.

In a period the ionization potential increases from left to right due to increase in the effective nuclear charge. The ionization potential of Be is higher than that of B. The electronic configurations of Be and  B are 1s22s2 and 1s22s22p1 respectively. Less energy is required to remove p electron than s electron.

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