Agar-Agar is used in salt bridge since it is:

an electrolyte

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a non-electrolyte

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an inert electrolyte

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a solid

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Solution

The correct option is B a non-electrolyte
Agar agar does not dissociate and is a non-electrolyte. It is used in salt bridge to prevent the intermixing of fluids which might otherwise occur. Being a non-electrolyte, it does not dissociate, hence there are no ions which can migrate.
Hence, option B is the correct one.

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Assertion : Salts like $K C l, K N O_{3}$ i.e., inert electrolytes are used in salt bridge.

Reason : An inert electrolyte can easily be filled in the U-tube.

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