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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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Potassium and caesium have much lower ionization enthalpy than that of lithium. As a result, e metals easily emit electrons on exposure to light. Due to this, K and Cs are used in photoelectric cells rather than lithium
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FULL MARKS-ALKALI AND ALKALINE EARTH METALS-Additional Questions Solved
  1. In what ways lithium snows similarities to magnesium in its chemical b...

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  2. Explain why can alkali and alkaline earth metals not be obtained by ch...

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

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

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  5. Why are lithium salts commonly hydrated and those of the other alkali ...

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  6. Why are alkali metals always univalent? Which alkali metal ion forms l...

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  7. What is the following compounds (Give equations for the reactions)?Wha...

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  8. Explain the following: (a) Lithium iodide is more covalent than lit...

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  9. Why alkali metals are soft and have low melting points?

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  10. Why is LiF almost insoluble in water, whereas LiCl soluble not only in...

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  11. Give reasons for the following. Sodium and potassium are stored in ker...

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  12. What is the structure of BeCl(2) ?

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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. . Alkali metals give colouration when heated in Bunsen flame. Give rea...

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  15. How Sodium metal  reacts with (i) ethanol and (ii) acetylene.

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  16. Mention the uses of lithium and its compounds.

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  17. What are the uses of sodium and its compounds?

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  18. What are the uses of potassium and its compounds?

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  19. What is soda ash ? How it obtained ?

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  20. List down the uses of washing soda.

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