Exams › JEE Advanced › Chemistry

Among the following singly charged negative ions, which one has the highest ionisation energy?

1. O-
2. S-
3. Se-
4. Te-

Correct answer: O-

Solution

O- is the smallest anion in the group (Group 16). Its extra electron is in the compact 2p shell and experiences the highest effective nuclear charge relative to its size, making it the hardest to ionise among O-, S-, Se-, Te-.

Related JEE Advanced Chemistry questions

• When the kinetic energy of an electron is quadrupled, how does the wavelength of its associated de-Broglie wave change?
• An electron labeled e₁ is in the fifth energy level, while another electron labeled e₂ is in the fourth energy level. The orbital radius of e₁ is five times that of e₂. What is the ratio of the speed of e₁ (v₁) to the speed of e₂ (v₂)?
• If the minimum wavelength of the spectral line in the Lyman series for a hydrogen atom is X, what is the maximum wavelength of the spectral line in the Balmer series for a Li²⁺ ion?
• For a sub-energy level with an azimuthal quantum number of 4, what are the highest and lowest possible spin multiplicities?
• The wave number is given by the formula ν = 1/λ = kZ² [1/n₁² - 1/n₂²]. For the Lyman series, the shortest wavelength (λₘₐₓ) occurs when n₁ = 1, n₂ = ∞, and Z = 1 (for a hydrogen atom). This simplifies to 1/λ = kZ² [1/1² - 1/∞²] ⇒ λ = 1/x. Which of the following statements is correct?
• In Bohr's theory, the electron with the greatest kinetic energy is found in:

⚔️ Practice JEE Advanced Chemistry free + battle 1v1 →