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Ammonium dichromate is used in fireworks...

Ammonium dichromate is used in fireworks. The green coloured blown in air is :

A

`CrO_(3)`

B

`Cr_(2)O_(3)`

C

Cr

D

`CrO(O)_(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
`(NH_(4))_(2)Cr_(2)O_(7) to Cr_(2)O_(3) + Cr_(2)O_(3) + N_(2) + 4H_(2)O`
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MODERN PUBLICATION-CHEMISTRY OF D-AND F-BLOCK ELEMENTS-Multiple Choice Questions (Level -I) Transition metal compounds and their Characteristics
  1. Which of the following ions exist as dimer ?

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  2. Kl and CuSO(4) solutions when mixed give :

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  3. Ammonium dichromate is used in fireworks. The green coloured blown in ...

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  4. The number of moles of KMnO4 that will be needed to react with one mol...

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  5. Silica is added to roasted copper ore during smelting in order to remo...

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  6. Iron is rendered passive when treated with conc. :

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  7. The principal oxidation state of lanthanides is :

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  8. The lanthanoid contraction refers to :

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  9. Which of the following is not correct ?

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  10. Which of the following ions is paramagnetic ?

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  11. The separation of landthanoids in ion exchange method is based on :

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  12. which of the following has the smallest ionic radius ?

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  13. Zr and Hf have almost identical atomic radii. Give reason.

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  14. The colour of lanthoanoids and actinoids is due to :

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  15. Which of the following has tendency to act as an oxidising agent ?

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  16. Which of the following pairs has almost same colours ?

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  17. Which of the following good oxidising agent ?

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  18. The major component of alloys of lanthanides is

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  19. The lanthanide contraction is responsible for the fact that

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  20. The electronic configuration of terbium (IV) (At no. 65) is

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