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On dissolving moderate amount of sodium ...

On dissolving moderate amount of sodium metal in liquid ammonia at low temperature, which of the following does not occur ?

A

Blue-coloured solution is obtqained.

B

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

C

Liquid ammonia becomes a good conductor of electricity.

D

Liquid ammonia remains diamagnetic.

Text Solution

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The correct Answer is:
C
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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 ?

Which of the following reaction does not occur?

Which of the following reactions does not occur ?

This metal is a liquid at room temperature :

This metal is a liquid at room temperature :

This metal is a liquid at room temperature.

This non-metal is liquid at room temperature :

Which of the following displacement does not occur:

Which of the following does not dissolve in water?

Name a metal which is liquid at room temperature.

CENGAGE CHEMISTRY ENGLISH-S-BLOCK GROUP 1 - ALKALI METALS-Exercises Single Correct
  1. The stability of the following alkali metal chlorides follows the orde...

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  2. The peramagnetic species is

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  3. On dissolving moderate amount of sodium metal in liquid ammonia at low...

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  4. The correct order of stability of hydrides of alkali metals is

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  5. A fire extinguisher contains H(2)SO(4) and

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  6. Which of the following compound is used in gun powder ?

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  7. Which of the following compounds is/are not soluble in water?

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  8. When a standard solution of NaOH is left in air for a few hours:

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  9. In the following sequence of recation, identify the compounds (A), (B)...

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  10. ZnCI(2)+NaHCO(3)overset("Heat")rarr (A)overset("Heat")rarr (B)+(C )+H(...

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  11. The carbonate that will not decompose on heating is

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  12. Which one of the following electrolysis is used in Down's process of e...

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  13. What is the reaction occuring at the anode in Down's process for the e...

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  14. shine at freshly cut sodium is because of

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  15. The solubility of alkali metal hydroxides follows the order:

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  16. The magnetic moment of KO(2) at room temperature is ---------- BM.

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  17. sodium peroxide which is a yellow solid, when exposed to air becomes...

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  18. among the alkali metals caesium is the most reactive because

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  19. Sodium hydride (NaH) when dissolved in water, produces

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  20. The correct order of stability for the following superoxides is

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