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Why are potassium and caesium, rather th...

Why are potassium and caesium, rather than lithium used in photochemical cells ?

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(i)Due to low ionisation energy K and Cs eject. electrons when exposed to light.
(ii) Lithium which has highest ionisation enthalpy among alkali meta ls cannot be used in photo electric cells because it does not release electrons when exposed to light
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SURA PUBLICATION- ALKALI AND ALKALINE EARTH METALS-ADDITIONAL SHORT ANSWER
  1. How does the alkali metals produce characteristic colour to the oxidis...

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  2. Why is the density of potassium less than that of sodium?

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  3. Why are potassium and caesium, rather than lithium used in photochemic...

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  4. Why does lithium exhibit anomalous properties ?

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  5. Why does the Li^(2+) ion combines only with O^(2-) ion ?

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  6. Comment on each of the following observations: (a) Lithium is the on...

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  7. Alkali metals exhibit high chemical reactivity Give reason.

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  8. Why sodium hydroxide is much more water soluble than chloride?

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  9. Carbonates and bicarbonates of alkali metals soluble in water and are ...

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  10. Write the chemical name of backing soda. Write any one of it uses.

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  11. What happens when crystals of washing soda are exposed to air?

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  12. List down the uses of washing soda.

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  13. List the uses of sodium hydroxide.

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  14. Why is sodium bicarbonate nicknamed as 'Baking Soda'?

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  15. Why does Li2CO3 decompose at a temperature below 1273K ?

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  16. What are 's' block elements ?

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  17. What is meant by 'diagonal relationship' in periodic table? Why is it ...

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  18. Explain the structure of BeCl2

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  19. Why does beryllium form BeCl2 although it has no unpaired electrons ?

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  20. Why are alkaline earth metal smaller than the Corresponding alkali met...

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