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A copper rod is dipped into each of the three test tubes P, Q and R containing AgNO3, FeSO4 and ZnSO4 solutions respectively. In which test tube no (chemical) displacement reaction occurs?

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A copper rod is dipped into each of the three test tubes P, Q and R containing AgNO<sub>3</sub>, FeSO<sub>4</sub> and ZnSO<sub>4</sub> solutions respectively. In which test tube no (chemical) displacement reaction occurs?






 
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