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When ammonium dichloromate is heated it ...

When ammonium dichloromate is heated it decompose and a spark is produced. The accompanying reaction is called

A

phosphorescence

B

incandescence

C

chemical valcano

D

fluorescence

Text Solution

Verified by Experts

The correct Answer is:
C
When ammonium dichromate is heated, the following reaction takes place:
`(NH_(4))_(2)Cr_(2)O_(7) overset(Delta)(to)Cr_(2)O_(3)+N_(2)+4H_(2)O`
`Cr_(2)O_(3)` which is formed is blown out due to explosion on ignition. Hence, it is called chemical volcano. It is an exothermic reaction.
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BANSAL-D AND F BLOCK ELEMENTS-Exercise-1 (Single Correct Choice Type)
  1. Pick out the incorrect statement:

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  2. The metals present in insulin and haemoglobin are respectively:

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  3. Metre scales are madeup of alloy:

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  4. A metal M which is not affected by strong acids like conc. HNO(3),conc...

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  5. underset(("Acidified"))(KMnO(4))+HCltoH(2)O+X(g),X is a:

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  6. Amongst the following species, maximum covalent character is exhibited...

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  7. Number of moles of K(2)Cr(2)O(7) can be reduced by 1 mole of Sn^(2+) i...

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  8. Pick out the incorrect statement:

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  9. The aqueous solution of CuCrO(4) is green because it contains:

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  10. The aqueous solution of the following salts will be coloured in the ca...

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  11. Rusting of iron in moist air involves-

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  12. Transition metals normally have unfilled 'd' orbitals which are degene...

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  13. Which one of the following transition metal ions is paramagnetic?

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  14. E^(Theta) value for the couple Cr^(3+)//Cr^(2+) and Mn^(3+)//Mn^(2+) a...

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  15. When ammonium dichloromate is heated it decompose and a spark is produ...

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  16. A mixture of K(2)Cr(2)O(7) and conc. H(2)SO(4) forms

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  17. When a photographic film is exposed and developed, the image is due to...

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  18. When SO(2) is passed through acidified K(2)Cr(2)O(7) solution

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  19. Which compound is deliquescent-

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  20. Anelement which is highly toxic for plants and animals is-

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