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A red solide is insoluble in water. Howe...

A red solide is insoluble in water. However it becomes soluble if some KI is added to water. On heating the red solid in a test tube, there is liberation of some violet coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is :

A

`(NH_(4))_(2)Cr_(2)O_(7)`

B

`HgI_(2)`

C

`HgO`

D

`Pb_(3)O_(4)`

Text Solution

Verified by Experts

The correct Answer is:
2
`Hgl_(2) darr + 2l^(-) to [Hgl_(4)]^(2-)` (colourless soluble complex)
`Hgl_(2) overset(Delta)to Hg+l_(2) uarr` (violet colour)
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RESONANCE ENGLISH-QUALITATIVE ANALYSIS PART 1-A.L.P
  1. A red solide is insoluble in water. However it becomes soluble if some...

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  2. When a salt is heated with dil H(2)SO(4) and KMnO(4) solution the pi...

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  3. Solution of a salt in dil H(2)SO(4) produces deep blue colour with st...

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  4. Two test tubes containing a nitrate and a bromide are treated separat...

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  5. An inorganic salt when heated with concentrated H(2)SO(4) evolves a co...

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  6. Chromyl chloride vapours are dissolved in water and acetic acid and ba...

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  7. When CS(2) layer containing both Br(2) and I(2) is shaken with exces...

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  8. A metal salt solution gives a yellow precipitate with silver nitrate.T...

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  9. Which of the following will not give positive chromyl chloride test ?

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  10. A white sodium salt dissolves in water to give a solution which is neu...

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  11. A one litre flask is full of brown bromine vapour. The intensity of ...

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  12. Identify the compound which turns black with ammonia solution.

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  13. A white crystalline substance dissolves in water.On passing H(2)S in t...

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  14. The composition of golden spangles is:

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  15. Select the incorrect statement(s).

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  16. What is passivity of Aluminium in presence of HNO3 ?

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  17. White precipitate of PbSO(4) gets dissolved in:

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  18. What final product(s) is/are formed in the following series of reacton...

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  19. Which of the following sulphides do not dissolve in 50% HNO(3) but dis...

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  20. Which of the following statement(s) is/are correct ?

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