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Why are potassium and caesium rather tha...

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

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

Li is used in photoelectric cells.

Alkali metals used in photoelectric cells

The metal used in photoelectric cell is-

Statement-1: Potassium and caesium are used in photo-electric cells. Statement-2: Potassium and caesium emit electrons on exposure to light above certain minimum frequency.

Why caesium and potassium are used as electrodes in photoelectric cells ?

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.

Why cesium can be used in photoelectric cell, while lithium cannot be ?

Why is lithium iodide more covalent than lithium fluoride ?

Potassium ferrocyanide is used in the detection of

ICSE-THE s - BLOCK ELEMENTS-SHORT ANSWER TYPE QUESTIONS
  1. Why are the alkali metal ions colourless and diamagnetic ?

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

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

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

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

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  6. Why are alkali metals not kept under water?

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

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

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

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

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

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

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

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

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

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

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  17. Why do alkaline earth metals have higher melting points than group 1 e...

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  18. Inspite of much higher second ionisation energy as compared to the fir...

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  19. Comment on the colour and magnetic behaviour of dipositive ions of gro...

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  20. Why do alkaline earth metals and their compounds impart characteristic...

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