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Which of the element is expected to have...

Which of the element is expected to have lowest first ionisation enthalpy

A

Sr

B

As

C

Xe

D

S

Text Solution

Verified by Experts

The correct Answer is:
A
S' lies in the 3rd 'As' in 4th while 'Sr' and 'Xe' lie in the fifth period. Except noble gases in general ionization enthalpy of the elements decreases as the serial number of the period increases. Thus ionization enthalpies of S and As are higher than that of Sr .But Xe being the noble gas has the highest ionization enthalpy . Thus Sr has the lowest ionization enthalpy .
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PRADEEP-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -Competition Focus (Jee Main and Advanced / Medical Entrance ) ( Multiple Choice Question I )
  1. Which of the following orders about ionization energy is correct...

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  2. Among the following, the third ionisation energy is highest for

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  3. Which of the element is expected to have lowest first ionisation entha...

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  4. Which of the following atoms has the highest first ionisation energy ?

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

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  6. The correct decreasing order of first ionisation enthalpies of five el...

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  7. Which of the following represents the correct order of increasing firs...

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  8. Screening effect is not observed in :

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  9. In which case, effective nuclear charge is minimum ?

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  10. The effective nuclear charge of an element with three valence electron...

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

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  12. Which electronic configuration of an element has abnormally high diffe...

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  13. The five successive energies of an element are 800, 2427, 3658, 25024 ...

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  14. For one of the element various successive ionization enthalpies ...

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  15. The following table shows the successive molar ionization energ...

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  16. One mole of magnesium in the vapor state absored 1200 kJ mol^(-1) of e...

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  17. Amongest Be, B, Mg and Al, the second ionization potential is maximum ...

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  18. The second ionization energies of Li, Be, B and C are in the order

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  19. Which of the following processes involves absorption of energy?

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  20. Electron affinity is positive when

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