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The correct decreasing order of first ionisation enthalpies of five elements of the second period is

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Important Questions on Classification of Elements and Periodicity in Properties

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11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 57
Which of the followings represents the correct order of increasing first ionisation enthalpy for Ca, Ba, S, Se and Ar?
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11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 58
Screening effect is not observed in
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11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 59
In which case, effective nuclear charge is minimum?
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11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 60
The effective nuclear charge of an element with three valence electrons is 2.60. What is the atomic number of the element?
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11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 61
Which of the following configuration represents atoms of the element having the highest second ionisation potential?
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11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 62
Which electronic configuration of an element has abnormally high difference between second and third ionisation energy ?
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11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 63
The five successive ionisation energies of an element are 800, 2427,3658, 25024 and 32824 kJ mol-1 respectively. The number of valence electrons is
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11th CBSE
IMPORTANT
Pradeep's Chemistry Vol 1>Chapter 3 - Classification of Elements and Periodicity in Properties>Competition Focus>Q 64

For one of the elements various successive ionisation enthalpies (in kJ mol-1) are given below: 

 1st 2nd 3rd 4th 5th
577.5 1810 2750 11,580 14,280

The element is