Calculate the number of electrons lost or gained during the changes.
$A l C l_{3} + 3 K \to A l + 3 K C l$

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Solution

$A l^{3 +}$ (from $A l C l_{3}$ ) gains 3 electrons to form $A l$ . Hence, number of electrons gained $= 3$ .
$A l^{3 +} + 3 e^{-} \to A l$
$3 K$ atoms loses 3 electrons to form 3 $K^{+}$ ions ( in $K C l$ ).
$3 K \to 3 K^{+} + 3 e^{-}$
Hence, number of electrons lost $= 3$ .

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