Question

# Adding common salt to distilled water makes it

A

Good conductor

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B

Insulator

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C

None of these

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D

Both (A) and (B)

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Solution

## The correct option is A Good conductorDistilled water is the purest form of water and contains no dissolved impurities or salts.When sodium chloride is added to water, it gets dissociated into sodium ions and chloride ions.$Nacl\to N{a}^{+}+c{l}^{-}$Sodium ions bear a positive charge and chloride ions bear a negative charge.When current flows through distilled water containing sodium chloride, the sodium ions move towards the negative terminal of the battery and the chloride ions move towards the positive terminal.The movement of the ions is based on the fact that “like charges repel and opposite charges attract”.Due to the movement of charge over an appreciable distance and in a particular direction, electric current flows through the distilled water containing sodium chloride.Due to the presence of sodium chloride in distilled water, it acts as a “good conductor” of electricity.In the absence of sodium chloride, distilled water acts as a bad conductor of electricity.Below is a diagram showing the movement of sodium ions and chloride ions in distilled water.Hence, option (A) is correct.

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