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Why are potassium and cesium, rather tha...

Why are potassium and cesium, rather than lithium can be used in photoelectric cells?

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Potassium and cesium have low ionisation enthalpy values, so electrons can be easily ejected from these metals when light of suitable frequency strikes on their surfaces. Lithium has high ionization enthalpy and therefore, it does not show photoelectric effect and cannot be used in photoelectric cells.
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MODERN PUBLICATION-S-BLOCK ELEMENTS ( ALKALI AND ALKALINE EARTH METALS ) -Conceptual Question 1
  1. ANOMALOUS BEHAVIOUR OF LITHIUM

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  2. Name the alkali metals which form superoxides when heated in excess of...

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  3. Name the metal which floats on water without any apparent reaction wit...

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  4. Predict giving reason, the outcome of the reaction: LiI + KF to

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  5. Why does the following reaction : proceed better with KF than w...

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  6. What compounds are formed when Li and Na combine with oxygen. Give the...

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  7. Explain why sodium is less reactive than potassium.

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  8. Why are potassium and cesium, rather than lithium can be used in photo...

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  9. Why are lithium salts commonly hydrated while those of other alkali me...

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  10. Why it LiF almost insoluble in water while LiCl is soluble not only in...

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  11. Lithium is the only alkali metal to form nitride directly. Explain .

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  12. An aqueous solution of sodium carbonate gives alkaline tests . Why ?

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  13. Why is Li(2)CO(3) decomposed at a lower temperature whereas Na(2)CO(3)...

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  14. LiH, LiF and Li(3)N show exceptional thermal stabilites. Comment.

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  15. Which out of Li or Na has greater value for the following properties :...

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  16. Which out of the following and why can be used to store an alkali met...

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  17. Why are alkali metals not found free in nature?

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  18. Why caesium can be used in photoelectric cell, while lithium cannot be...

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  19. Complete the following reactions : (i) O2^(2-) + H2O to (ii) O2^(-)...

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  20. Can potassium carbonate like sodium carbonate be prepared by Solvay pr...

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