Question

Please explain how it is choice A

Answer 1

size of ions different atoms can determined by the following rules

1) if same number of electrons are present   then size order : anion > neutral > cation

2) more atomic number for same ions either cations or anions the size will be more . here Cl- and F- are same group elements

F atomic number is 9 Cl atomic number is 17. so larger size Cl-

3) now compare K + and Cl- both have same number of electrons 18. but anion size is more than cation size. so Cl- is larger than F- and K+

4) now Cu2+ is d-block element due to poor shield effect of d-block element the size of Cu2+ is lower than anion Cl-