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A red solid is insoluble in water.Howeve...

A red solid is insoluble in water.However it becomes soluble if some `KI` is added to water.Heating the red solid in a test tube results in 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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Knowledge Check

  • A red coloured solid is insoluble in water. However, it becomes soluble if some KI is added to water. Heating red solid in a test tube results in the 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)`

  • 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
    `HgO`
    B
    `Pb_(3)O_(4)`
    C
    `(NH_(4))_(2) Cr_(2)O_(7)`
    D
    `Hgl_(2)`

  • A solid is a compound of group I element and it gives a bright red colour in the flame test. The solid is

    A
    LiBr
    B
    CaCl
    C
    KCl
    D
    NaCl
    • RESONANCE-QUALITATIVE ANALYSIS PART 1-A.L.P
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    9. Which of the following will not give positive chromyl chloride test ?

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

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    15. Select the incorrect statement(s).

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    16. Original solution of salt or mixture should not be prepared in concent...

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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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