The correct order hydration |Thes-BlockElementsJEEMain2019

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JEE MAIN 2019

08-04-2019 S1

Question

The correct order of hydration enthalpies of alkali metal ions is

Select the correct option:

$\mathrm{Na}^{+}>\mathrm{Li}^{+}>\mathrm{K}^{+}>\mathrm{Rb}^{+}>\mathrm{Cs}^{+}$

$\mathrm{Li}^{+}>\mathrm{Na}^{+}>\mathrm{K}^{+}>\mathrm{Cs}^{+}>\mathrm{Rb}^{+}$

$\mathrm{Na}^{+}>\mathrm{Li}^{+}>\mathrm{K}^{+}>\mathrm{Cs}^{+}>\mathrm{Rb}^{+}$

$\mathrm{Li}^{+}>\mathrm{Na}^{+}>\mathrm{K}^{+}>\mathrm{Rb}^{+}>\mathrm{Cs}^{+}$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

Smaller is size more is hydration energy. $$ \begin{array}{ll} \mathrm{Li}^{+}<\mathrm{Na}^{+}<\mathrm{K}^{+}<\mathrm{Rb}^{+}<\mathrm{Cs}^{+} & \text {Size } \\ \mathrm{Li}^{+}>\mathrm{Na}^{+}>\mathrm{K}^{+}>\mathrm{Rb}^{+}>\mathrm{Cs}^{+} & \text {Hydration energy } \end{array} $$

Question Tags

JEE Main

Chemistry

Easy

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