Correct order of first IP among following elements Be, B, C, N, O is

Correct Answer:

B< Be < C Explanation:

Be – 1s²2s²; B – 1s²2s²2p¹; C – 1s²2s²2p²;N – 1s²2s²2p³;O – 1s²2s²2p⁴. IP increases along the period. But IP of Be > B. Further IP of O < N because atoms with fully or partly filled orbitals are most stable and hence have high ionisation energy.

Related Questions:

1. Fish die in water bodies polluted by sewage due to
2. When initial concentration of a reactant is doubled in a reaction, its half-life
3. When phenol reacts with phthalic anhydride in presence of H₂SO₄ and heated
4. For a thermodynamically reversible reaction in a galvanic cell at temperature T,
5. How many FeSO₄.7H₂SO₄ will be oxidised by an acidified solution containing 9.48g

Question Type: Memory (964)
Difficulty Level: Easy (1008)
Topics: Classification of Elements and Periodicity (94)
Subject: Chemistry (2512)

---

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.