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Periodic Table and Periodicity question

2002 · Q100
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Periodic Table and Periodicity question

2002 · Q100

NEETChemistryPeriodic Table and PeriodicityMCQ+4 / −1
Which of the following order is wrong?
  1. A
    NH3 < PH3 < AsH3 −-− acidic
  2. B
    Li < Be < B < C −-− 1st IP
  3. C
    Al2O3 < MgO < Na2O < K2O −-− basic
  4. D
    Li+ < Na+ < K+ < Cs+ −-− ionic radius.
View written solutionFree

Correct answer: B

Along the period, I.P. generally increases but not regularly. Be and B are exceptions. First I.P. increases in moving from left to right in a period, but I.P. of B is lower than Be.

As in case of boron, 2p1 electron have to be removed to get B+(1s2 2s2) from B(1s2 2s2 2p1), while in case of Be (1s22s2) electron have to be removed to get Be+ (1s22s1). p electron can be removed more easily than s electron so the energy required to remove electron will be less in case of boron.

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