Solid copper sulfate does not conduct electricity, but when it is dissolved in water, it does conduct electricity. This is because

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In solid-state ions are not mobile. But in dissolved water, it breaks into ions.

It is a bad conductor in both solid and dissolved states.

Both 1 and 2

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answer is A.

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Detailed Solution

Solid copper sulfate does not conduct electricity, but when it is dissolved in water, it does conduct electricity. This is because solid-state ions are not mobile. But in dissolved water, it breaks into ions.
Copper sulfate in the solid state has molecules tightly packed. There is no chance for electricity to pass in this state. While dissolving copper sulfate in water, the attraction between the particles is lost and it starts moving constantly and gets mixed in water. After dissolving, it breaks down into copper and sulfate ions. These ions conduct the electric current.

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