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Question

Which of the following statements is true about electrolytes?

A
Electrolytes are always in solution.
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B
Electrolytes are made of strong acids and bases.
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C
An electrolyte always needs to be ionic in nature.
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D
An electrochemical cell always needs an electrolyte.
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Solution

The correct option is D An electrochemical cell always needs an electrolyte.
- Electrolytes are not always in solution or aqueous form. It is also possible to have electrolytes in the molten form or fused form. For example: Molten NaCl.

- Electrolytes can also be made of weak acids and weak bases in which case they would be called weak electrolytes. For example: Acetic acid and ammonium hydroxide.

- It is possible to have covalently bonded electrolytes which would typically be weak electrolytes. For example: Hydrochloric acid.

- An electrolyte is always needed in any type of cell for the transfer of ions and electrons through it without which the cell wouldn't function.

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