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Grade 12th PassInorganic Chemistry

The correct sequence of ionic mobility in aqueous solution of Rb+,k+,Cs+,Na+ is?

Profile image of abhisar kumar
13 Years agoGrade 12th Pass
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4 Answers

Profile image of Roshan Mohanty
13 Years ago

Cs+ > Rb+ > K+ > Na+

Profile image of pushpendra bansal
13 Years ago

ionic mobility decrases with increase in atomic size

in alkali metal in aaqueos solution size order reverse

so order of ionic mobility order is

cs+ > rb+ >k+ >na+

Profile image of Shubham Bhansali
9 Years ago
The alkali metal ion exist as hydrated ions M+(H2O)n in the aqueous solution. The degree of hydration, decreases with ionic size as we go down the group. Hence Li+ ion is mostly hydrated e.g. [Li(H2O)6]+. Since the mobility of ions is inversely proportional to the size of the their hydrated ions, hence the increasing order of ionic mobility isLi+
Profile image of Sanju
8 Years ago
Reverse order is ssen in case of alkali metals so begin with ce then rb then k then na and lastly li will be present due to reac5ivity

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