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The alkali metals have low melting point...

The alkali metals have low melting point. Which of the following alkali metal is expected to melt if the room temperature rises to `30^(@)C` ?

A

`Na`

B

`k`

C

`Rb`

D

`Cs`

Text Solution

Verified by Experts

The correct Answer is:
D
The energy binding the atoms in the crystal lattice of the alkali metals is low due to their large atomic radii and especially due to the presence of one valence electron per metal atom as compared to large number of availabel vacant orbitals.
Hence, alkali metals have low melting and boiling points. The melting point of alkali metals decreases from `Li` to `Cs` as cohesive force decreases with increase in atomic size. Melting point of `Cs=302K`, i.e., `29^(@)C`.
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A2Z-S BLOCK ELEMENTS ( GROUP 13 - 14)-Section D - Chapter End Test
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  2. Plaster of Paris hardens by

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  3. The mixture of MgCl(2) and MgO is called .

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  4. Which monoxide of alkali metals is slowly hydrolysed ?

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  5. Which of the following has lowest thermal stability ?

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  6. Solution of K(2)O in water in basic, because it contains a significant...

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  7. The order of melting point of chloirdes of alkali metals is :

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  8. Sodium carbonate reacts with SO(2) in aqueous medium to give

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  9. Sodium dichormate on heating with coke yields :

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  10. Which one out of the NaOH and KOH is a better absorber of CO(2) ?

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  11. Reduction of sodium nitrite by sodium metal yields:

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  12. Which of the following statement is incorrect ?

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  13. What products are formed during the electrolysis of a of a concentrat...

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  14. Na+Al(2)O(3) overset("High temp.") rarrXoverset(CO(2)" in")underset("w...

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  15. What happens when a mixture of sodium sulphate, lime stone and coke is...

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  16. The order of basicity of hydroxides of alkali metals is

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  17. What happens when sodium metal is heated to a temperature 350^(@)C in ...

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  18. Solubility of an ionic compound in water is mainly dependent on: a...

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  19. Na(2)Be(OH)(4)] is formed when

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  20. What is the formula of basic anhydride of Ba(OH)(2)?

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  21. What is the correct order of thermal stability of carbonates of alkali...

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