Li,Be,B,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) is lower than that of beryllium (Be →2s2 ), since in case of boron, 2p1 electron have to be removed to get B+, while in case of Be,2s2 electron have to be removed to get Be+(2s1). p electron can be removed more easily than s electron so the energy required to remove electron will be less in case of boron. The order will be Li<B<Be<C
Which of the following order is wrong?
NEET UG 2002 — Chemistry Inorganic Chemistry
2002mcqmedium
Which of the following order is wrong?
Official previous-year question
Held on 30 Apr 2002 · Verified 9 Jul 2026.
Options
- A
NH3<PH3<AsH3 - Acidic
- B
Li<Be<B<C− First ionization potential
- C
Al2O3<MgO<Na2O<K2O− Basic
- D
Li+<Na+<K+<Cs+−Ionic radius
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