Inwhich of the following does current is not conducted by electrons
A) mercury
B) silver
C) common salt solution
D) copper

Hello Sahajpreet, option 3 i.e. salt solution. All other three are metals in which current is passed only by the passage of electrons. But in salt solution Na positive ions and Cl negative ions are the charge carriers in case of salt solution

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hi...... the ans is MERCURY 
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The correct answer is option A) Mercury.
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