Inorganic Chemistry> which of the alkali metal has lowest ioni...

which of the alkali metal has lowest ionic mobility under electric field

divya , 7 Years ago

Grade 12th pass

4 Answers

Shlok Agrawal

Last Activity: 7 Years ago

as u have mentioned no options i assume this question is from neet 2017 paper , the answer to this is LITHIUM..

Ankur

Last Activity: 7 Years ago

Li+ being smallest, has maximum charge density . Li+ is most heavily hydrated among all alkali metal ions. Effective size of Li+ in aq solution is therefore, largestand therefore moves slowest under electric field.

Shlok Agrawal

Last Activity: 7 Years ago

Yes lithium is correct ans.. Challenge that question..

its answer is given wrong in neet answer key.. lithium being smallest is hydrated most . Thus attains very large size in aq. State thus moves slowest

Suman Rk

Last Activity: 7 Years ago

In the answer key Rb is given as the answer. I think that is because under electric field the alkali metal ions are not hydrated as H+ and OH- ions move towards positive and negative electrode. So Rb (among the others) having the largest size has least mobility