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Introduction to Optical Isomerism

Which ionisat...

Question

Which ionisation energy of alkaline earth metal is less than that of alkali metals?

A

Third

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B

Second

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C

First

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D

Fourth

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Solution

The correct option is B Second
The second ionisation energy of alkaline earth metal is less than that of alkali earth metals.
The 2nd electron in case of alkali metal is to be removed from a cation (unipostive ion) which has already acquired a noble gas configuration whereas, in case of alkaline earth metals, the second electron is to be removed from a cation which is yet to acquire the stable noble gas configuration. Therefore, removal of 2nd electron in case of alkaline earth metals requires much less energy than that in the case of alkali metals.

Hence, the correct option is $B$

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Similar questions

Q. The first ionisation enthalpies of the alkaline earth metals are higher than that of alkali metals but second ionisation enthalpies are smaller, why?

Q. Assertion :Alkaline earth metals have lower densities than alkali metals. Reason: Atomic radii of alkaline earth metals are larger than that of corresponding alkali metals.

Q. Assertion :Alkaline earth metal salts are less soluble in water than the corresponding alkali metal salts. Reason: Alkaline earth metal cations possess high lattice energy due to their smaller size and higher charge.

Q. Assertion :The crystalline salts of alkaline earth metals contain more water of crystallization than the corresponding alkali metal salts. Reason: The size of alkaline earth metal ions is lower than the size of alkali metal ions. The lower the size of the cation, the higher is the hydration energy. So the salts of alkaline earth metals have more water molecules of crystallization than those of alkali metals.

The first ionization energies of alkaline earth metal are higher than of the alkali metals. Explain.

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