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Why the electron gain enthalpy values of...

Why the electron gain enthalpy values of alkaline earth metals are lower or positive?

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PATHFINDER-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-QUESTION BANK
  1. The ionisation energy of lithium is 500 KJ mol^(-1) The amount of ener...

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  2. How many groups are occupied by P-block element in the long form of pe...

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  3. Why the electron gain enthalpy values of alkaline earth metals are low...

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  4. Select neutral acidic basic and amphoteric oxides from the following ...

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  5. Ionisation energy and electron affinity of fluorine are respectively 1...

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  6. Match the following columns

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  7. Arrange the following ions in the increasing order of their size :Be^(...

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  8. Match the following columns

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  9. Match the following columns

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  10. Match the following columns

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  11. As per the modern periodic law the physical and chemical properties of...

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  12. Which of these does not reflect the periodicity of the elements

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  13. Which of the following pairs of atomic numbers represent elements belo...

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  14. All the elements in a group in the periodic table have the same

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  15. The elements in which 4f orbitals are progressively filled up are call...

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  16. Which of the following elements does not belong to first transition se...

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  17. The name of 'rare earths' is used for

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  18. In genral outer electronic configuration of the elements of group ViB ...

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  19. What is the group no.of an element having atomic no.105?

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  20. Which of the following ionic radius would be maximum?

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