Q1. Name any two metals that are more reactive than iron.
Answer: Aluminium and zinc are more reactive than iron.
Q2. What happens when copper is added to ferrous sulphate solution?
Answer: No reaction will occur as copper is less reactive than iron.
Q3. What is the colour of copper sulphate solution?
Answer: Copper sulphate solution is blue coloured.
Q4. What is the colour of the aluminium sulphate solution?
Answer: Aluminium sulphate solution is colourless.
Q5. What is the colour of the ferrous sulphate solution?
Answer: Ferrous sulphate solution is green coloured.
Q6. Why did the cuprous sulphate solution colour change when zinc metal was dipped?
Answer: Cuprous sulphate solution colour changed when zinc metal was dipped into it because zinc is more reactive than copper. Zinc displaces copper from copper sulphate and forms zinc sulphate.
CuSO4 + Zn → ZnSO4 + Cu
Q7. What will you observe when copper is added to the ferrous sulphate solution?
Answer: No reaction will occur when copper is added to the ferrous sulphate solution.
Cu + FeSO4 → No Reaction
Q8. Which are the most and the least reactive metal in the above experiment?
Answer: Aluminium is the most reactive, while copper is the least reactive metal in the above experiment.
Q9. Why can we safely preserve ferrous sulphate in a copper vessel, whereas we can not preserve the same in a zinc vessel?
Answer: We can preserve ferrous sulphate in a copper vessel because copper is less reactive than iron. Thus no reaction will take place. But, we can not store ferrous sulphate in a zinc vessel because zinc is more reactive than iron. Thus, it will displace iron from ferrous sulphate and form zinc sulphate solution.
FeSO4 + Cu → No Reaction
Q10. What does the reactivity series of metals indicate?
Answer: The reactivity series of metals indicates the reactivity of metals in decreasing order.
Q11. Can we store zinc sulphate in an aluminium container? Give a reason for your answer.
Answer: No, we can not store zinc sulphate in an aluminium container because aluminium is more reactive than zinc. Thus, it will displace zinc from zinc sulphate solution and form aluminium sulphate.
3 ZnSO4 + 2 Al → Al2(SO4)3 + 3 Zn
Q12. Can we store copper sulphate in an iron container? Give a reason for your answer.
Answer: No, we can not store copper sulphate in an iron container because iron is more reactive than copper. Thus, it will displace copper from copper sulphate solution and form ferrous sulphate.
CuSO4 + Fe → FeSO4 +Cu
Q13. Why is the reactivity of different metals different?
Answer: The reactivity of different metals is different because of the difference in the tendency to lose electrons.
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