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In the following four test tubes, some m...

In the following four test tubes, some metals are in contact with certain salt solutions. After the experiment, in which of the test tubes does the solution becomes colourless and a powdery red mass is deposited at the bottom of the test tube ?

Text Solution

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In test tube (C), the blue solution of `CuSO_(4)` becomes colourless. Zn will displace Cu from `CuSO_(4)` solution. Cu will be deposited as red powder and a colourless solution of `ZnSO_(4)` is obtained.
`Zn+underset("Blue")(CuSO_(4)) to underset("Colourless")(ZnSO_(4)) + underset("Red")(Cu)`
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  • 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 :

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