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What will be the order of first ionisati...

What will be the order of first ionisation energy?

A

`Li gt Na gt k `

B

`K gt Li gt Na`

C

` Na gt Li gt K`

D

`Li gt K gt Na`

Text Solution

Verified by Experts

The correct Answer is:
A
In a group, the ionisation potential decreases from top to bottom. In the alkali group, the ionisation potential decrease from `Li` to `Cs`.
`{:(,Li,Na,K,Rb,Cs),(eV,5.3,5.1,4.2,4.3,3.9):}`.
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A2Z-CLASSIFICATION OF ELEMENTS AND PERIODICITY OF PROPERTIES-Section D - Chapter End Test
  1. In which of the following arrangements , the order is not correct acco...

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  2. Which one of the following arrangements represents the correct order o...

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  3. What will be the order of first ionisation energy?

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  4. which of the following configurations represents atoms of the elements...

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  5. The first ionisation potential in electron volts of nitrogen and oxyge...

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

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  7. Which is the correct order of ionic sizes (At, No : Ce=58,Sn=50,Yb=70 ...

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  8. A sudden large jump between the values of second and third ionisation ...

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  9. Which element having the following electronic configuration has minimu...

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  10. Arrange F,Cl,O,N in the decreasing order of electronegativy

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  11. Two elements whose electronegativities are 1.2 and 3.0 the bond formed...

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  12. Among Al(2)O,SiO(2),P(2)O(3) and So(2) the correct order of acid stren...

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  13. The order in which the following oxides are arranged according to decr...

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  14. Be and Al exhibit many properties which are similar. But the two eleme...

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  15. The order of magnitude of ionic radii of ions Na^(+),Mh^(2+),Al^(3+) a...

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  16. The order of the magnitude of first ionisation potentials of Be,B,N an...

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  17. Which of the following transitions involves maximum amount of energy?

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  18. Mg and Li are similar in their properties due to

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  19. Which among the following elements have the lowest value of IE(1)?

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  20. The first ionisatin potential is maximum for

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