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Why are the second ionisation enthalpies...

Why are the second ionisation enthalpies of group 1 elements much higher than their first ionisation enthalpies ?

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The second ionisation enthalpies of elements are always higher than their first ionisation enthalpies because:

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ICSE-THE s - BLOCK ELEMENTS-SHORT ANSWER TYPE QUESTIONS
  1. Why do alkali metals possess low densities?

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  2. How do the ionisation enthalpies of alkali metals vary on moving down ...

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  3. Why are the second ionisation enthalpies of group 1 elements much high...

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  4. 'Each alkali metal is the most electropositive element in its period'....

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  5. Why do alkali metals not show variable oxidation states ?

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  6. Why do alkali metals show characteristic colours in a non luminous fla...

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  7. Sodium readily formsNa^(+)ion but never forms Na^(2+) ion. Explain.

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  8. Why are the alkali metal ions colourless and diamagnetic ?

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  9. What is photoelectric effect? State t he result of photoelectric effec...

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  10. Why are potassium and caesium rather than lithium used in photoelectri...

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  11. Alkali metals are highly reactive elements. Explain, why?

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  12. What happens when alkali metals are exposed to air ?

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  13. Why are alkali metals not kept under water?

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  14. Why are lithium halides partially covalent ? Explain with examples.

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  15. Give a reason for each of the following: Alkali metals are good red...

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  16. Inspite of very high ionisation energy, lithium is the strongest reduc...

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  17. Why are the solutions of alkali metal atoms in liquid ammonia blue col...

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  18. Why does the basic strength of the hydroxides of alkali metals increas...

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  19. Name the chief factor responsible for the anomalous behaviour of lithi...

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  20. The elements of group 2 are called alkaline earth metals. Give reason.

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