Assertion :A saturated solution of KCl is used in making salt bridge. Reason: Ionic mobilties of $K^{\oplus}$ and $C l^{⊖}$ are same.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
A salt bridge is used to prevent the accumulation of charges, at the electrodes.

Salt bridge is an inverted u shaped tube, filled with Agar-Agar gel which is saturated with an electrolyte $K C l (o r) K N O_{3}$ , (or) $N H_{4} N O_{3}$ .

The solution of KCl (or) $K N O_{3}$ (or) $N H_{4} N O_{3}$ acts as inert electrolyte.

The cations and anions of the electrolyte used should be of the same ionic mobility.

The electrolyte should be inert.

So, they are used in the making of salt bridge.

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

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

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