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On dissolving moderate amount of sodium ...

On dissolving moderate amount of sodium metal in liquid `NH_(3)` at low temperature, which one of the following does not occur.

A

Blue coloured solution is obtained

B

`Na^(+)` ions are formed in the solution

C

Liquid `NH_(3)` becomes good conductor of electricity

D

Liquid ammonia remains diamagnetic

Text Solution

Verified by Experts

The correct Answer is:
D
Moderate amount of Na metal
`Na + Liq. NH_(3) rarr underset("ammoniated sodium")([Na(NH_(3))_(2)]^(+))`
Due to presence of `rarr underset("ammoniated e")([e(NH_(3))_(y)]^(-))`
`e^(-)` blue colored solution obtained.
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On dissolving moderate amount of sodium metal in liquid ammonia at low temperature, which of the following does not occur ?

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Alkali metals oxide are obtained by combustion of the metals.Although Na normally gives Na_2O_2 ,it will take up further oxygen at elevated pressure and temperature to form NaO_2 .The per and superoxides of the heavier alkalies can also be prepared by passing stoichiometric amounts of oxygen into their solution in liquid ammonia. The different alkali metal oxides can be distinguished by reaction with water.The superoxides reacts with CO_2 and give oxygen gas.The stability of per and superoxides is based upon that larger cation can stablise larger anion, due to larger lattice energy. Alkali metals dissolve in liquid ammonia.Dilute solutions are dark blue in colour but as the concentration increases above 3M, the colour changes to copper bronze and the solution acquires the metallic lusture due to the formation of metal ions clusters.The solutions of alkali metals in liquid ammonia are good conductors of electricity due to the presence of ammoniated cations and ammoniated electrons.However, the conductivity decreases as the concentrations increases, since ammoniated electrons and ammoniated cation associate. On dissolving smaller (less than 3M) amount of sodium metal in liquid ammonia at low temperature , which one of the following does not occur ?

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ALLEN-S-BLOCK ELEMENTS -EXERCISE
  1. The correct sequence of increasing covalent character is represented b...

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  2. The paramagnetic species is -

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  3. On dissolving moderate amount of sodium metal in liquid NH(3) at low t...

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  4. Which of the following gives propyne on hydrolysis?

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  5. The pairr of amphoteric oxides is

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  6. The pair whose both species are used in antacid medicinal preparation...

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  7. Which of the following oxides is not expected to reast with sodium hyd...

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  8. A compound X on heating gives a colourless gas. The residue is dissolv...

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  9. Property of the alkaline earth metals that increases down the group w...

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  10. Which of the following compounds has the lowest meting point?

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  11. Match List-I with List-II for the composition of substances and select...

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  12. Which of the following statements is incorrect

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  13. Which of the following is not hygroscopic-

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  14. The compound which does not exist as hydrate form

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  15. Bleaching powder does not contain:

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  16. Sodium sulphate is soluble in water whereas barium sulphate is sparing...

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  17. The minimum equivalent conductane in fused state is shown by :-

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  18. Sodium hydroxide is manufacture by the electrolysis of brine solutio...

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  19. Sodium carbonate is manufactured by Solvay process. The products that ...

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  20. Which of the following does not illustrate the anomalous properties of...

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