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NEET 2002
Exam
NEET
Year
2002
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

NEET 2002 · Chemistry · Classification of Elements and Periodicity in Properties

Which of the following order is wrong?

Which of the following order is wrong?

Options

  1. ANH3<PH3<AsH3\mathrm{NH}_3 < \mathrm{PH}_3 < \mathrm{AsH}_3 - Acidic
  2. BLi<Be<B<C−\mathrm{Li} < \mathrm{Be} < \mathrm{B} < \mathrm{C}- First ionization potential
  3. CAl2O3<MgO<Na2O<K2O−\mathrm{Al}_2 \mathrm{O}_3 < \mathrm{MgO} < \mathrm{Na}_2 \mathrm{O} < \mathrm{K}_2 \mathrm{O}- Basic
  4. DLi+<Na+<K+<Cs+−\mathrm{Li}^{+} < \mathrm{Na}^{+} < \mathrm{K}^{+} < \mathrm{Cs}^{+}-Ionic radius

Correct answer

B. Li<Be<B<C−\mathrm{Li} < \mathrm{Be} < \mathrm{B} < \mathrm{C}- First ionization potential

Step-by-step solution

Li,Be,B,C\mathrm{Li}, \mathrm{Be}, \mathrm{B}, \mathrm{C} - these elements belong to the same period. Generally, the value of 1 st ionisation potential increases in moving from left to right in a period, since the nuclear charge of the elements also increase in the same direction. But the ionisation potential of boron (B→2s2p1)islowerthanthatof\left(\mathrm{B} \rightarrow 2 s^2 p^1\right)is lower than that ofberyllium (Be \rightarrow 2 s^2),sinceincaseofboron,), since in case of boron,2 p^1electron have to beremovedtogetB+,whileincaseofBe,2s2be removed to get \mathrm{B}^{+}, while in case of \mathrm{Be}, 2 s^2 electron have to be removed to get Be+(2s1).\mathrm{Be}^{+}\left(2 s^1\right).pelectroncanberemovedmoreeasilythanelectron can be removed more easily thanselectron so the energyrequiredtoremoveelectronwillbelessincaseofboron.TheorderwillbeLienergy required to remove electron will be less in case of boron. The order will be \mathrm{Li} <B\mathrm{B}<Be\mathrm{Be}< C\mathrm{C}
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