A) The conductivity decreases from \[\text{Li}\]to \[\text{C}{{\text{s}}^{+}}\]in the hydrated ions.
B) The stability of +5 oxidation state decreases from nitrogen to bismuth.
C) In HalFs process, bauxite is fuse with \[\text{N}{{\text{a}}_{\text{2}}}\text{C}{{\text{O}}_{\text{3}}}\text{.}\]
D) The atomic radius in IIIA group elements increases from boron to aluminium and thereafter remains constant up to gallium.
Correct Answer: A
Solution :
The conductivity of an ion depends upon its size as follows: \[\text{Conductivity}\propto \frac{\text{1}}{\text{ionic}\,\text{size}}\] In aqueous solution, \[\text{L}{{\text{i}}^{\text{+}}}\,\text{ion}\]is extensively hydrated. Hence, \[\text{L}{{\text{i}}^{\text{+}}}\,\,\text{ion}\]has the largest hydrated ionic radius. The hydrated ionic radius decreases down the group, ie, it decreases from \[\text{L}{{\text{i}}^{\text{+}}}\,\]to \[\text{C}{{\text{s}}^{+}}\,.\]Therefore, in hydrated ions, the conductivity increases from\[\text{L}{{\text{i}}^{\text{+}}}\]to \[\text{C}{{\text{s}}^{+}}.\]
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