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  4. Out of Cu, Al Fe and Zn, metal which can displace all others from their salt solution is :

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Q. Out of $Cu,\, Al\, Fe$ and $Zn$, metal which can displace all others from their salt solution is :

Bihar CECEBihar CECE 2003Electrochemistry

Solution:

The element occupying higher position in electrochemical series, displaces the metals present below it from their salts.
$\because$ Among $Cu,\, Al,\, Fe,$ and $Zn,\, Al$ occupies highest position in electrochemical series.
$\therefore $ Al displaces $Cu,\, Fe$ and $Zn$ from their salts.