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Which of the following has the highest r...

Which of the following has the highest reactivity towards water?

A

`Na`

B

`Rb`

C

`Li`

D

`K`

Text Solution

Verified by Experts

The correct Answer is:
B
The reaction of alkali metals with water becomes increasingly violent on descending the group on account of their decreasing ionisation energies with increasing atomic size. So, the order of reactivity is :
`Li lt Na lt K lt Rb`.
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A2Z-S BLOCK ELEMENTS ( GROUP 13 - 14)-Section D - Chapter End Test
  1. Which of the following has the highest reactivity towards water?

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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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