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On exposure to air, alkali metals get ta...

On exposure to air, alkali metals get tarnished due to formation of oxides, hydroxides and carbonates on their surface. When heated in air or oxygen they burn vigorously forming different types of oxides depending upon the nature of the metal. The formation and stability of these metals can be explained on the basis of size of alkali metal ion and the anion. Peroxides are colourless, while superoxides are coloured. The normal oxides are basic while peroxides and superoxides act as oxidising agents.
Oxone is

A

CaO

B

`N_(2)O`

C

`Na_(2)O_(2)`

D

`NaBO_(3)`

Text Solution

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The correct Answer is:
C
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On exposure to air, alkali metals get tranished due to formation of oxides, hydroxides and carbonates on their surface. When heated in air or oxygen they burn vigourously forming different types of oxides depending upon the nature of the metal. The formation and stability of these metals can be explained on the basis of size of alkali metal ion and the anion. Peroxides are colourless, while superoxides are coloured. The normal oxides are basic while peroxides and superoxides act as oxidising agents. On heating in excess of oxygen, potassium gives

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CENGAGE CHEMISTRY ENGLISH-S-BLOCK GROUP 1 - ALKALI METALS-Exercises Single Correct
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  2. Among LiCl, RbCl, BeCl2, MgCl2, the compounds with greatest and least ...

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  3. which of the following compounds on reaction with NaOH and H(2)O(2)...

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  4. stable oxide is obtained by heating the carbonate of the elements

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  5. Ease with which hydrides are formed form Li to Cs:

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  6. For the preparation of sodium thiosulphate by "Spring's reaction', the...

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  7. Li(2)SO(4) is not isomorphous with sodium sulphate:

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  8. Prefix 'alkali' for alkali metals denotes:

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  9. The chloride that can be extracted with ether is

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  10. Which of the following has the lowest melting point ?

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  11. On exposure to air, alkali metals get tarnished due to formation of ox...

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  12. In view of their low ionisation energies, the alkali metals are

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  13. which of the following has the lowest melting point ?

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  14. When sodium is treated with sufficient oxygen/air, the product obtaine...

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  15. The products of electrolysis of concentrated common salt solution are

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  16. Elements in the first column of the periodic table are called alkali m...

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  17. One of the natural minerals of sodium is tincal. Its formula is

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  18. Na(2)CO(3)+Fe(2)O(3)rarr A+CO(2), what is A in the reaction ?

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  19. When dry ammonia gas is passed over heated sodium (out of contact of a...

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  20. The principal products obtained on heating iodine with cold and concen...

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