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Alkali metals and their salts impart cha...

Alkali metals and their salts impart characteristic colours to an oxidizing flame. Explain the reason.

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The alkali metals and their salt impart characteristic colour to an oxidising flame. This is because the heat from the flame excits the outermost orbital electron come back to the ground state, they emit the absorbed energy in the form of light in visible region.
Lithium - Crimson red
Sodium - Yellow
Potassium - Lilac or pale violet
Rubidium - Red violet
Caesium - Blue violet.
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VGS PUBLICATION-BRILLIANT-THE s-BLOCK ELEMENTS -Short Answer Questions (4 Marks)
  1. Alkali metals and their salts impart characteristic colours to an oxid...

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  2. What makes caesium and potassium useful as electrodes in photoelectric...

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  3. Write a short note on the reactivity of alkali metals towards air.

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  4. Give any two uses for each of the following metal. (i) Lithium

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  5. Give any two uses for each of the following metal. (ii) Sodium.

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  6. Give an account of the properties of washing soda.

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  7. Mention some uses of sodium carbonate.

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  8. How do you obtain pure sodium chloride from a crude sample?

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  9. What do you know about Castner-Kellner process? Write the principle in...

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  10. Write a few applications of caustic soda.

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  11. Give an account of the biological importance of Na^(+) and K^(+) ions.

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  12. Mention the important uses of Mg metals.

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  13. Show that Be(OH)(2) is amphoteric in nature.

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  14. Write a note on the anomalous behaviour of beryllium.

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  15. Be shows diagonal relationship with Al. Disicuss.

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  16. What is Plaster of Paris? Write a short note on it.

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  17. In what ways lithium shows similarities to magnesium in its chemical b...

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

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  19. What happens when (i) Sodium metal is dropped in water?

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  20. What happens when (ii) Sodium metal is heated in a free supply of ai...

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