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(a) Arrange the following metals in order of their chemical reactivity, placing the most reactive metal first:

Magnesium, Copper, Iron, Sodium, Zinc, Lead, Calcium.

(b) What happens when a rod of zinc metal is dipped into a solution of copper sulphate? Give chemical equation of the reaction involved.

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(a) Sodium > Calcium > Magnesium > Zinc > Iron > Lead > Copper

(b) When a strip of zinc metal is put in copper sulphate solution, then the blue colour of copper sulphate solution fades gradually and red brown coating of copper is deposited on the zinc strip.

Zn (s)    +      CuSO4 (aq)   →    ZnSO4(aq)  +  Cu (s)

Zinc                Copper sulphate        zinc sulphate      copper

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1  Sodium,

2. The zinc will displace copper from it's sulphates solution, because zinc is more reactive metal than copper.

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