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Ionisation energy in group I-A varies in...

Ionisation energy in group I-A varies in the decreasing order as

A

`LigtNagtKgtCs`

B

`NagtLigtKgtCs`

C

`LigtCsgtKgtNa`

D

`KgtCsgtNagtLi`

Text Solution

Verified by Experts

The correct Answer is:
A
Due to the large size of group IA elements, the outermost electron is far from the nucleus and can easily be removed. Their ionisation energies or ionisation potentials are relatively low.
`{:(,Li,Na,K,Rb,Cs),("Ionisation potential (ev)",5.4,5.1,4.3,4.2,3.9):}`
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ERRORLESS -CLASSIFICATION OF ELEMENTS AND PERIODIC PROPERTIES -Ordinary Thinking Objective Questions Ionisation Energy
  1. Which of the following elements will have the lowest first ionisation ...

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  2. Which of the following species has lowest ionisation potential?

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  3. The correct order in which the first ionisation potential increases is

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  4. Generally, the first ionisation energy increases along a period. But t...

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  5. Ionisation energy in group I-A varies in the decreasing order as

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  6. The second ionisation potential of an element M is the energy required...

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

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  8. Which ionisation potential (IP) in the following equations involves th...

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  9. Which of the following has highest ionisation energy ?

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  10. Which one of the following elements has the highest ionisation energy?

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  11. Which of the following electrons should generally have the highest val...

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  12. The first ionisation energy of beryllium is more than that of boron be...

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  13. A rarr A^(+)+e,E(1) and A^(+) rarr A^(2+)+e,E(2). The energy requried ...

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  14. Which of the following explanation is best for not placing hydrogen in...

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  15. Choose the correct statement

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  16. The ionisation energy of an element is

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  17. Assertion :First ionization energy is lower than oxygen. Reason :Ac...

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  18. Assertion: E^(@) for Mn^(3+)//Mn^(2+) is more positive than Cr^(3+)//C...

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  19. Assertion : Ionisation enthalpy is always negative. Reason : Energy...

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  20. Assertion: Ionisation potential across the period is NaltAlltMgltSi. ...

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