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Why are potassium and caesium, rather th...

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

Text Solution

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They have lower ionisation energy as compared to Li.
Therefore, they can lose elec.tron easily and preferred in photoelectric cells.
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V PUBLICATION-THE s- BLOCK ELEMENTS-QUESTION BANK
  1. Lithium shows similarities in properties with Magnesium. Give any two ...

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  2. Explain why alkali and alkaline earth metals cannot be obtained by che...

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

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  4. When an alkali metal dissolves in liquid ammonia the solution can acqu...

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  5. Beryllium and magnesium do not give colour to flame whereas other alka...

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  6. Discuss the various reactions that occur in the solvay process.

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  7. Potassium carbonate cannot be prepared by Solvay process. Why?

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  8. Li2CO3 decomposes at a lower temperature whereas Na2CO3 at higher temp...

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  9. Compare the solubility and thermal stability of the following compound...

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  10. Starting with NaCl how would you proceed to prepare Na2CO3?

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  11. What happenes when quick lime is heated with silica

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  12. Describe two important uses of each of the following. (i) Caustic sod...

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  13. Draw the structure of (i) BeCl2 (vapour) (ii) BeCl2(solid).

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  14. The s-block of periodic table constitutes alkali metals and alkaline e...

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  15. Describe the importance of the following (i) Lime stone (ii) Cement (i...

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  16. Why are lithium salts commonly hydrated and those of other alkail meta...

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  17. Why is LiF almost insoluble in water whereas 'LiCl' is soluble not onl...

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  18. Monovalent Na^+, K^+ ions and divalent Ca^(2+) , Mg^(2+) ions are fou...

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  19. What happens when (i) sodium metal is dropped in water (ii) sodium met...

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  20. Comment on the following observation The mobility of alkali metal ions...

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