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Generally the ionisation potential in a ...

Generally the ionisation potential in a period increases, but there are some exceptions. The one which is not an exception is

A

Be and B

B

N and O

C

Mg and AI

D

Na and Mg

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The correct Answer is:
C
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Discuss the variation of ionisation potentials of second period elements

The minimum amount of energy required to remove the most loosely bound electron from an isolated atom in the gaseous state in known as ionisation energy or ionisation enthalpy (IE_1) of the element. The energy required to remove the second electron from the monovalent cation is called second ionisation enthalpy (IE_2) . Similarly, we have third, fourth ..... inonisation enthalpies. The values of ionisation energy depends on a number of factors such as (i) size of the atom (ii) screening effect (iii) nuclear charge (iv) half filled and fully filled orbitals (v) shape of orbital. In a group, the ionisation energy decreases from top to bottom. In a period, the value of ionisation energy increases from left to right. Compared to the second ionisation energy of an atom, the third ionisation

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AAKASH SERIES-PERIODIC CLASSIFICATION-OBJECTIVE EXERCISE - 2 (IONISATION POTENTIAL)
  1. IP1 and IP2 of Mg are 178 and 348 "k cal mol"^(-1). The energy require...

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  2. Among the elements A, B, C and D having atomic numbers 7,8,9 and 12 th...

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  3. Correct order of first ionisation potentials

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  4. The first ionisation potentials of four consecutive elements present i...

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  5. The decreasing order of second ionisation potential of K, Ca, Ba is

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  6. The incorrect order of second ionization energies in the following is

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  7. Ionisation energy of F^- is equal in magnitude with the electron affin...

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  8. Some statements are given. Among them the correct statements are (a...

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  9. (IE)1 and (IE)2 of Mg((g)) are 740, 1540 kJ mol^(-1) . Calculate perce...

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  10. Successive ionisation potentials of an element M are 8.3, 25.1, 37.9, ...

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  11. The decreasing order of the first ionization energy in kJmol^(-1) of H...

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  12. In a period from left to right A) nuclear charge increases B) eff...

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  13. If the lonisation potential (I.P.) of Na is 5.48 eV. The I.P. of K wil...

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  14. A sudden jump between the values of second and third ionisation energi...

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  15. Amongst the following elements (whose electronic configurations are gi...

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  16. The first ionization energy of Lithium will be

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  17. A sudden jump between the values of second and third ionisation energi...

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  18. Generally the ionisation potential in a period increases, but there ar...

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  19. Element that has the highest first ionisation energy among the followi...

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  20. The ionization potential of nitrogen is more than that of oxygen becau...

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