Question

b) why Copper sulphate solution becomes colourless when zinc metal is added to it.` Ionic compounds do not conduct electricity in the solid state.`
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Answer 1

Answer:

why because copper sulphate has more compounds to do

Answer 2

Explanation:

Copper lies below zinc in the activity series. Hence, zinc is a more reactive metal than copper. Hence, when zinc is added to the blue coloured copper sulphate solution, the more reactive zinc displaces the copper from the salt to form a colourless solution of zinc sulphate or white vitriol.

The equation to support the answer -

CuSO₄ + Zn ----------> ZnSO₄ + Cu

[Blue]                           [Colourless]

Ionic compounds have very strong forces of attraction between the ions which keeps the ions in place and does not allow their mobility. If there are no free ions, then it is impossible for the conduction of electricity. However, in the case of an aqueous solution, due to the strong dielectric constant of water, the compound is dissolved, which releases the ions and makes them free which allows the conduction of electricity. When in the molten state, the force of attraction is weakened, for which the ions get mobility and hence conduct electricity.

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