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Why do alkali metals show characteristic...

Why do alkali metals show characteristic colours in a non luminous flame?

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(a). Which alkaline earth metals do not give characteristic colour to the Bunsen flame? (b). Why alkaline earth metals do not form tripositive ions? (c ). Why alkaline earth metals are diamagnetic, but alkali metals are paramagnetic? (d). Why the first inonisation enthaply pf alkaline earth matals is higher than those of corresponding alkali metals? (e). Why alkaline earth metals are less electropositive than corresponding alkali metals?

Give reasons for the following: a. Alkli metals do not occur free in nature. b. Alkali metal salts impart characteristic colour to the flame. c. Caesium is used in photoelectric cell. d. Alkali metals are good reducing agents in aqueous medium.

Which is the characteristic flame colouration of Li?

ICSE-THE s - BLOCK ELEMENTS-SHORT ANSWER TYPE QUESTIONS
  1. 'Each alkali metal is the most electropositive element in its period'....

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

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

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

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

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

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

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

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

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  10. Why are alkali metals not kept under water?

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

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

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

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

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

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

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

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  18. The atomic radii of alkaline earth metals are smaller than those of th...

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  19. Why are the second ionisation energies of alkaline earth metals much s...

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  20. Among alkaline earth metals which element do you expect to be least el...

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