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Q.

Which one of the following types of chemical reactions occurs when a zinc strip is dipped into a copper sulphate solution (CuSO4 (aq) + Zn (s) ZnSO4 (aq) + Cu (s))?


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a

Displacement reaction

b

Double-displacement reaction

c

Combination reaction

d

Decomposition reaction 

answer is A.

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Detailed Solution

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The chemical reaction that occurs when a zinc strip is dipped into a copper sulphate solution is CuSO4 (aq) + Zn (s) ZnSO4 (aq) + Cu (s). The type of reaction that will occur is a displacement reaction.
The reactions in which an element (more reactive) displaces the other element (less reactive) from its salt solution are called displacement reactions. In this, zinc being a more reactive element, is placed higher in the reactivity series, so it displaces copper from its salt solution (copper sulphate).
CuSO4 (aq) + Zn (s) ZnSO4 (aq) + Cu (s)
 
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