The correct order of hydration energy of alkaline
earth metal is:

B e^{2 +} > M g^{2 +} > C a^{2 +} > S r^{2 +} > B a^{2 +}

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B a^{2 +} > B e^{2 +} > C a^{2 +} > M g^{2 +} > S r^{2 +}

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M g^{2 +} > B e^{2 +} > B a^{2 +} > C a^{2 +} > S r^{2 +}

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Solution

The correct option is A $B e^{2 +} > M g^{2 +} > C a^{2 +} > S r^{2 +} > B a^{2 +}$
The hydration energies of alkaline earth metals decreases on moving down the group. The decreasing order is $B e^{2 +} > M g^{2 +} > C a^{2 +} > S r^{2 +} > B a^{2 +}$ . All the alkaline earth metals have same charge. But the atomic size increases on moving down the group. Hence, the charge density decreases on moving down the group. This decreases the hydration energy.

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Similar questions

Q. Predict the correct order of mobility of

B e^{2 +}

M g^{2 +},

S r^{2 +}

and

C a^{2 +}

ions in aqueous medium.

Q. Predict the correct order of mobility of

B e^{2 +}

M g^{2 +},

S r^{2 +}

and

C a^{2 +}

ions in aqueous medium.

The charge/ size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, $K^{+}, C a^{2 +}, M g^{2 +}, B e^{2 +}$

C f^{2 +}, E s^{2 +}, F m^{2 +}, M d^{2 +} a n d N o^{2 +}

have the properties similar to that of alkaline earth metal

Q. The heat of hydration of

C a^{2 +}, S r^{2 +}

and

B a^{2 +}

in the decreasing order is:

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The correct order of hydration energy of alkalineearth metal is:

The correct order of hydration energy of alkaline
earth metal is: