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If the ionic radii of each K^(+) and F^(...

If the ionic radii of each `K^(+)` and `F^(-)` are `1.34Å`, then tha atomic radii of `K` and `F` will be respectively:

A

1.34 Å, 1.34 Å

B

0.72 Å, 1.96 Å

C

1.96 Å, 0.72 Å

D

1.96 Å, 1.34 Å

Text Solution

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The correct Answer is:
C
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If the ionic radii of K^(+) and F^(-) are nearly the same (i.e., 1.34A^(o) ) ,then the atomic radii of K and F respectively are:

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. If the ionic radii of K^(+) and F^(-) are about 1.34 Å each, then the expected value of atomic radii of K and F should be respectively:

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VK JAISWAL-PERIODIC PROPERTIES-Level 2
  1. Increasing order of ionic size : N^(3-),Na^(+),F^(-),O^(2-),Mg^(2+)

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  2. The order of increasing ionic radius of the following is:

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  3. If the ionic radii of each K^(+) and F^(-) are 1.34Å, then tha atomic ...

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  5. X((g)) to X((g))^(+) +e^(-), " "DeltaH=+720kJ" "mol^(-1) C...

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  6. Consider the following changes :- M((s)rarrM((g))" ""....."(a) ...

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  7. The correct order of second ionisation potential of C, N, O and F is:

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  8. Which is the correct order of ionisation energies ?

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  9. Which of the following statements is incorrect?

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  10. First ionization energy is the lowest with:

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  12. The correct values of ionization enthalpies(in KJ "mol"^(-1)) of Si, P...

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  13. The third ionisation energy will be maximum for:

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