WBCS.LIVE practice question

Which of the following pairs is isoelectronic?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. N₂, CO
  2. NO, CO
  3. CO, CN⁻
  4. O₂, CN⁻

Correct answer and explanation

Correct answer: CO, CN⁻

Explanation: ✅ Correct Answer: C. CO, CN- 📚 Explanation: Isoelectronic species are atoms or ions that have the same total number of electrons. Carbon Monoxide (CO) has 6 + 8 = 14 electrons. The Cyanide ion (CN-) has 6 + 7 + 1 = 14 electrons. Therefore, CO and CN- are isoelectronic with each other. This concept is important in understanding molecular structures and bonding.