NEET Solved Paper 2017 Question 44
Question: Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field?
Options:
A) Li
B) Na
C) K
D) Rb
Show Answer
Answer:
Correct Answer: A
Solution:
$ L{i^{+}} $ being smallest, has maximum charge density
$ \therefore $ $ L{i^{+}} $ is most heavily hydrated among all alkali metal ions. Effective size of $ L{i^{+}} $ in aq solution is therefore, largest.
$ \therefore $ Moves slowest under electric field.
