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Alkali metals have lowest value of ionisation enthalpy in a period. On moving down the group from top to bottom, the ionisation enthalpy decreases. Hence from the graph, M has least ionisation enthalpy.
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MODERN PUBLICATION-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -COMPETITION FILE (OBJECTIVE TYPE QUESTIONS (B)) (MCQs)

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  2. The set representing the correct order of ionic radius is

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  3. Which of the following sets will have highest hydration energy and hig...

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  4. The first (Delta(i)H(1)) and second (Delta(i)H(2)) ionization enthalpi...

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  5. The correct sequence which shows decreasing order of the ionic radii o...

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

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  7. Which of the following is the largest in size ?

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  8. An element belongs to group 15 and third period of the periodic table....

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  9. Whicn one fo the following has the lowest ionisation enthalpy ?

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

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  11. The correct order of decreasing electronegativity values among the ele...

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  12. Considering the elements B, C, N, F and Si, the correct order of their...

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  13. the correct order of electron gain enthalpy with negative sign of F,Cl...

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  14. Among the following, the element with highest ionisation potential is

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  15. The correct order of ionisation energy of C, N, O and F is

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  16. The correct order of electronegativities of N,O, F and P is

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  17. The ionic radii of N^(3-) O^(2-), F^-, Na^+ follows the order

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  18. The increasing order of the ionic radii of the given isoelectronic spe...

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  19. Which one of the following sets of ions represents the collection of i...

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  20. Which of the followng noble gases has the highest positive electron ga...

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