Match the column- - Column-I - - - Column-IINa - Be - p - Show diagonal relstionship with other elements-lb - Mg - q - Highest hydration energy of - cation among the elements 1c - Ca - r - Cation has lowest hydrated size in aqueous solution-d - Sr - s - Metals which dissolve in liquid ammonia to give deep blue solutionll-t - s-block elements l array

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Hydration Enthalpy and Lattice Enthalpy (Group 2)

Match the col...

Question

Match the column:
$\begin{matrix} C o l u m n - I & C o l u m n - I I (a) & B e & (p) & S h o w d i a g o n a l r e l s t i o n s h i p w i t h o t h e r e l e m e n t s (b) & M g & (q) & H i g h e s t h y d r a t i o n e n e r g y o f c a t i o n a m o n g t h e e l e m e n t s (c) & C a & (r) & C a t i o n h a s l o w e s t h y d r a t e d s i z e i n a q u e o u s s o l u t i o n (d) & S r & (s) & M e t a l (s) w h i c h d i s s o l v e i n l i q u i d a m m o n i a t o g i v e d e e p b l u e s o l u t i o n (t) & s - b l o c k e l e m e n t s \end{matrix}$

(a) p,q,t; (b) p,t; (c) s, t; (d) r, s, t

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(a) p,q,t; (b) s,t; (c) p, t; (d) r, s, t

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(a) r,s,t; (b) p,t; (c) s, t; (d) p,q,t

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(a) p,q,t; (b) r,s,t; (c) s, t; (d) p,t

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Solution

The correct option is A (a) p,q,t; (b) p,t; (c) s, t; (d) r, s, t
All the elements belong to the alkaline earth metals (s-block).
From the given alkaline earth metals, $B e$ exhibits a diagonal relationship with $A l$ .
Likewise, $M g$ displays diagonal relationship with $L i$ .
Like alkali metals, both $C a$ and $S r$ are soluble in liquid ammonia.

$B e^{2 +}$ has the highest hydration enthalpy. This can be explained by the smallest
ionic radius and thus the highest charge density (among the given ions).
The extent of hydration and also the hydration sphere is the largest for $B e^{+ +}$ .
$S r^{+ +}$ has the lowest charge density $\Rightarrow$ lowest hydration sphere radius.

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