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Q.

The experiment shown is used to test potassium bromide crystals.

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The lamp does not light.

Distilled water is then added to the beaker and the lamp lights.

Which statement explains these results?

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a

Metal ions are free to move when potassium reacts with water

b

Oppositely charge ions are free to move in the solution when potassium bromide dissolved in water.

c

Metal ions are free to move when potassium bromide melts

d

Electrons are free to move in the solution when potassium bromide dissolves

answer is D.

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Detailed Solution

Neutral substances in solid state doesn’t conduct electricity. When they are dissolved in water, they dissociate into ions conducting electricity.

KBrH2OK(aq)++Br(aq)  

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