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Extraction of Metals

Which of the ...

Question

Which of the following is the correct conclusion. Also, give the reason?

Observation I II III

Solution after reaction Colourless Colourless Colourless

Metal Deposited Zn Cu Fe

(a) Al is more reactive than Cu and Fe but less reactive than Zn
(b) Al is more reactive than Cu but less reactive than Zn and Fe
(c) Al is more reactive than Zn and Cu but less reactive than Fe
(d) Al is more reactive than Zn, Cu, Fe.

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Solution

(d) Al is more reactive than Zn, Cu, Fe

Reason:

$2 A l + 3 Z n S O_{4} \to A l_{2} (S O 4)_{3} + 3 Z n$
$2 A l + 3 C u S O_{4} \to A l 2 (S O 4)_{3} + 3 C u$
$2 A l + 3 F e S O_{4} \to A l_{2} (S O 4)_{3} + 3 F e$

Al is more reactive than Zn, Cu and Fe because it displaces them from their salt solution.

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