Question
Electron affinity is positive, when
BITSAT
Chemistry
Classification of Elements and Periodicity in Properties
2024
BITSAT 2024 (Memory Based Paper 3)
BITSAT Chemistry Question (2024) — Solution
Options
- A. O changes into O ^ -
- B. O ^ - changes to O ^ 2-
- C. O changes into O ^ +
- D. O changes to O ^ 2+
Answer
B. O ^ - changes to O ^ 2-
Step-by-step solution
When O ^ - changes into O ^ 2- , energy is absorbed i.e the change is endothermic because O ^ - repels the incoming electron due to similar charge. H ice, it needs energy to add (accept) the electron. So, electron affinity ( EA _2 ) is positive.
Related: Chemistry — Classification of Elements and Periodicity in Properties · All PYQ Banks