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Why does the ionisation energy decrease ...

Why does the ionisation energy decrease on going down a group?

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Because the attractive force of nucleus on electrons of outermost cell decreases down the group. Therefore ionization becomes easier.
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AAKASH INSTITUTE ENGLISH-THE S-BLOCK ELEMENTS-Try Yourself
  1. Explain the trend in atomic radii on moving down a group, with referen...

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  2. Which one of the following alkali metals gives hydrated salts?

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  3. Why does the ionisation energy decrease on going down a group?

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  4. Among potassium and sodium which one is lighter metal?

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  5. What colour is imparted by Rubidium in flame test?

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  6. Which alkali metal do not show photoelectric effect?

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

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  8. What do metal oxides form when they react with water?

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  9. K, Rb and Cs form mainly superoxides.

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  10. Which compound is formed when lithium reacts directly with nitrogen in...

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  11. What is electrode potential?

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  12. If an element has more negative value of electrode potential, then wha...

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  13. Apart from water, alkali metals react with which kind of compounds?

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  14. Mention the important properties of saline hydrides

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  15. Except for lithium, alkali metals form their hydrides at what temperat...

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

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  17. Among the alkali metals, which element has the highest reducing power...

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  18. If standard electrode potential of an element x is -1.70V and of anoth...

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  19. The alkali metals dissolve in ammonia to give a deep blue solution whi...

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  20. Why is the solution of an alkali metal in ammonia blue?

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