| \[X={{[Li{{({{H}_{2}}O)}_{n}}]}^{+}}\] |
| \[Y={{[K{{({{H}_{2}}O)}_{n}}]}^{+}}\] |
| \[Z={{[Cs{{({{H}_{2}}O)}_{n}}]}^{+}}\] |
A) \[Z>Y>X\]
B) \[Z>X>Y\]
C) \[X=Y=Z\]
D) \[X>Y>Z\]
Correct Answer: D
Solution :
The degree of hydration depends upon the size of the cation. Smaller the size of a cation greater is its charge density and hence greater is its tendency to draw electrons from molecules which are thus polarised. \[L{{i}^{+}}\] ion being smallest in size among alkali metal ions is the most extensively hydrated while \[C{{s}^{+}}\] ion the largest alkali metal ion is the least hydrated. The size of hydrated alkali ions is as \[L{{i}^{+}}>N{{a}^{+}}>{{K}^{+}}>R{{b}^{+}}>C{{s}^{+}}\]
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