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Which of the following isoelectronic ion...

Which of the following isoelectronic ions have the lowest ionization enthalpy ?

A

`K^(+)`

B

`Ca^(2+) `

C

`Cl^(-)`

D

`S^(2-)`

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The correct Answer is:
D
In isoelectronic ions, greater the negative charge, lower the ionisation energy
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The properties of the elements (atomic/ionic radii, electron gain enthalpy, ionization enthalpy, electronegativity, valence, oxidising/reducing power, acid/base character, etc.) which are directly or indirectly related to their electronic configirations are called periodic properties. These properties show a regular gradation on moving from left to right in a period or form top to bottom in a group. Down a group, the atomic/ionic radii, metallic character and reducing character increase while ionization enthalpy and electronegativity decrease. Along a period from left to right, atomic/ionic and metallic character decrease while ionization enthaloy, electronegativity, non-metallic character and oxiding power increase. However, electron gain enthalpy becomes less negative down a group butmore negative along a period. In contrast, inert gases have positive electron gain enthalpies which do not show may regular trend. Which of the following isoelectronic ions has the lowest first ionization enthalpy?

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DINESH PUBLICATION-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-All Questions
  1. The second ionisation potential is

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  2. Which of the elements show least values of ionisation enthalpy within ...

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  3. Which of the following isoelectronic ions have the lowest ionization e...

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  4. Which of the following process requires the largest amount of energy ?

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  5. From the ground state electronic configuration of the elements given ...

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  6. The elements which occupy the peaks of ionisation energy curve are

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  7. The power of an atom to attract the shared pair in a molecule:

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  8. Which out of the following has the largest ionisation energy ?

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  9. Which of the following has the largest ionisation energy.

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  10. Which of the following statement concerning ionisation energy is not c...

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  11. The pair in which the ionisation energy of first species is less than ...

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  12. Arrange S, P and As in order of increasing ionisation energy.

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  13. The first ionisation potential of calcium is greatyer than that of pot...

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  14. The increasing order of ionisation energy among sulphur, phosphorous a...

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  15. Which of the following does not affect the ionisation potential of the...

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  16. Which of the following process refers to ionisation potential ?

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  17. r("(van der Waal)") is

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  18. The correct order of the size of C, N, P, S following the order:

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  19. Which of the following has smallest size ?

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  20. Which of the following units are used frequently for atomic radii ?

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