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Reaction with Metals

Which of the ...

Question

Which of the following metals is lightest and which one of them is least reactive?
$C u, A g, A l, F e$

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Solution

The lightest metal element is $A l$ and the least reactive metal is $A g$ among the given metals.

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{CuSO}_{4} (aq) + Fe (s) \underset{}{\to} {FeSO}_{4} (aq) + Cu (s) {FeSO}_{4} (aq) + Zn (s) \underset{}{\to} {ZnSO}_{4} (aq) + Fe (s)

On the basis of the above reactions, indicate which is most reactive and which is least reactive metal out of zinc, copper and iron.

Q. 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.

{CuSO}_{4} (aq) + Fe (s) \underset{}{\to} {FeSO}_{4} (aq) + Cu (s) {FeSO}_{4} (aq) + Zn (s) \underset{}{\to} {ZnSO}_{4} (aq) + Fe (s)

On the basis of the above reactions, indicate which is most reactive and which is least reactive metal out of zinc, copper and iron.

Q. Arrange the following metals in decreasing order of their reactivity :

F e, Z n, N a, C u, A g

M g, A l, Z n, F e

A g

are metals of reactivity series:
(a) Which of this metal shows the highest reactivity?
(b) If an electrochemical cell is devised by dipping Fe in

F e S O_{4}

solution and Ag in

A g N O_{3}

solution, which electrode is acting as cathode? Give reason.

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