Question

Ionic conductances of hydrated $M ^{+}$ ions are in the order-

• A. $L i^{+}(a q) > N a^{+}(a q) > K^{+}(a q) > R b^{+}(a q) > C s^{+}(a q)$
• B. $Li ^{+}( aq ) > Na ^{+}( aq ) < K ^{+}( aq ) < Rb ^{+}( aq ) < Cs ^{+}( aq )$
• C. $L i^{+}(A q) > N a^{+}(a q) > K^{+}(a q) > R b^{+}(a q) < C s^{+}(a q)$
• D. $L i^{+}(a q) < N a^{+}(a q) < K^{+}(a q) < R b^{+}(a q) < C s^{+}(a q)$

Answer 1

Answer: (D)

Due to high charge density of $Li ^{+}$ is attracts more water molecules and becomes bulky so the ionic conductances of $M ^{+}$ ions increase from $Li ^{+}$ ion to $Cs ^{+}$ ion.

$Li ^{+}($ aq. $)< Na ^{+}($ aq. $)< K ^{+}($ aq. $)< Rb ^{+}($ aq. $)< Cs ^{+}($ aq. $)$