SATHEE: The sBlock Elements - Result Question 8

The sBlock Elements - Result Question 8

####9. The correct order of the mobility of the alkali metal ions in aqueous solutions is

[2006]

(a) $N a^{+} > K^{+} > R b^{+} > L i^{+}$

(b) $K^{+} > R b^{+} > N a^{+} > L i^{+}$

(c) $R b^{+} > K^{+} > N a^{+} > L i^{+}$

(d) $L i^{+} > N a^{+} > K^{+} > R b^{+}$

Show Answer

Solution:

(c) Hydrated Ionic radii of alkali metals in water follows the order $L i^{+} > N a^{+} > K^{+} > R b^{+} > C s^{+}$

Thus in aqueous solution due to larger ionic radius $L i^{+}$ has lowest mobility and hence the correct order of ionic mobility is

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