The experiment shown is used to test potassium bromide crystals.

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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Metal ions are free to move when potassium reacts with water

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

Metal ions are free to move when potassium bromide melts

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.

$K B r \overset{H_{2} O}{\to} K_{(a q)}^{+} + B r_{(a q)}^{-}$

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