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When a set of electrodes connected to a light bulb is placed in a solution of dextrose and a current is applied, the light bulb does not light up. When the same unit is placed inHCl, it does. Why?

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Answer:

Dextrose being an organic compound consists of only molecules with covalent bonds, having no free ions to conduct electricity so the bulb doesn't glows. On the other hand, HCl being a polar covalent compound, in its aqueous solution dissociates into ions and the free ions are responsible for conduction of electricity so the bulb glows.

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