JEE Main 20207 JanuaryEvening Shift
- Exam
- JEE Main
- Year
- 2020
- Date
- 7 January
- Shift
- Evening Shift
- Subject
- Chemistry
- Chapter
- Classification of Elements and Periodicity in Properties
JEE Main 2020 · 7 January · Evening Shift · Chemistry · Classification of Elements and Periodicity in Properties
Within each pair of elements F and~ Cl , S and~ Se , and Li and~ Na...
Within each pair of elements and~ , and~ , and and~ , respectively, the elements that release more energy upon an electron gain are
Options
- A and
- B and
- C and
- D and
Correct answer
B. and
Step-by-step solution
(i) Electron affinity of second period -block element is less than third period -block element due to small size of second period -block element, due to small size electron density is more and upcoming electron face extra repulsion, so energy release is less. Hence, EA order: .
(ii) Down the group electron affinity decreases due to size increases. EA order: .
(ii) Down the group electron affinity decreases due to size increases. EA order: .