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Why are group 1 elements called alkali m...

Why are group 1 elements called alkali metals ?

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### Step-by-Step Solution: 1. **Definition of Alkali Metals**: Group 1 elements in the periodic table are known as alkali metals. This group includes lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). 2. **Reactivity with Water**: Alkali metals are characterized by their vigorous reaction with water. When they react with water, they produce hydrogen gas and a strong alkaline solution of hydroxides. 3. **Formation of Hydroxides**: The reaction of alkali metals with water leads to the formation of hydroxides, such as sodium hydroxide (NaOH) and potassium hydroxide (KOH). These hydroxides are strong bases. ...
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ICSE-THE s - BLOCK ELEMENTS-SHORT ANSWER TYPE QUESTIONS
  1. What is diagonal relationship? Mention two diagonally related pairs of...

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  2. What is the cause of diagonal relationship ? Explain with examples.

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  3. Why are group 1 elements called alkali metals ?

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  4. Why is each alkali metal atom largest in its period ?

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  5. Why do ionic radii of alkali metals increase on moving down the group ...

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  6. Why do alkali metals possess low densities?

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  7. How do the ionisation enthalpies of alkali metals vary on moving down ...

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  8. Why are the second ionisation enthalpies of group 1 elements much high...

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  9. 'Each alkali metal is the most electropositive element in its period'....

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  10. Why do alkali metals not show variable oxidation states ?

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  11. Why do alkali metals show characteristic colours in a non luminous fla...

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  12. Sodium readily formsNa^(+)ion but never forms Na^(2+) ion. Explain.

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  13. Why are the alkali metal ions colourless and diamagnetic ?

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

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

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

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

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  18. Why are alkali metals not kept under water?

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

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

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