Viva Voce: Reactivity Series | Lab Manuals for Class 10 PDF Download

Q.1. Name any two metals that are more reactive than iron.

Zinc (Zn) metal and aluminium (Al) metal are more reactive than iron.

Q.2. What is your observation when copper is added to iron (II) sulphate solution?

When copper is added to iron (II) sulphate solution, then no reaction takes place because copper is less reactive than iron.

Q.3. Why can be safely preserve iron (II) sulphate in a copper vessdl whereas the same cannot be safely preserved in zinc vessel?

Since, copper is less reactive than iron so, we can safely preserve iron (II) sulphate in a copper vessel. But zinc is more reactive than iron, so we cannot safely preserve iron (II) sulphate in zinc vessel.

Q.4. Solutions of copper sulphate, iron sulphate and zinc sulphate are prepared and marked I, II and III respectively. Few pieces of aluminium are added to each solution. In which test tube would you see a change?

In all the three solutions, changes occur. Aluminium displaces all the other metals from their salt solution.

Q.5. Can we store ZnSO₄ in an aluminium container? Justify your answer.

No, we cannot store ZnSO₄ in an aluminium container because Al is more reactive than Zn.

Q.6. Iron filings were added to an aqueous solution of copper sulphate. After sometime of observation it was found that the colour of the solution has changed. What change in colour is observed?

The colour of the solution has changed from blue to yellowish green as the formed iron sulphate imparts pale green colour to the solution.

Q.7. Can we store copper sulphate in an iron container? Give reason for your answer.

No, we cannot store copper sulphate in an iron container because iron is more reactive than copper therefore, it will displace copper from copper sulphate solution.

Q.8. Why does blue colour of the CuSO₄ solution fade away on stirring with an iron rod?

Iron being more reactive displaces blue coloured Cu²⁺ ions as Cu atoms.

Q.9. Why do copper pieces not react with FeSO₄ solution in water?

Copper metal is lesser active than iron in the activity series.

Q.10. A thin plate of zinc metal is placed in a beaker containing aqueous ferrous sulphate solution. The zinc plate is taken out after 15 min. What change in colour of the solution is observed?

The solution becomes colourless.

Q.11. A strip of copper was placed in a beaker containing zinc sulphate solution. On observing the strip next day, what was noticed by student?

On observing the strip next day, student may observe that the copper strip remained as it was.

Q.12. What does the reactivity series of metals indicate?

The reactivity series of metals indicates the reactivities of different metals in decreasing order while going from top to bottom.

Q.13. When an aluminium strip is kept immersed in freshly prepared ferrous sulphate solution taken in a test tube, what change would you observe?

The light green colour of the solution turns colourless due to the displacement reaction.

Q.14. Which is the most and the least reactive metal in the above experiment?

In the above experiment; aluminium is most reactive and copper is least reactive metal.

Q.15. Why did the colour of copper (II) sulphate solution change, when zinc metal was dipped in it?

Zinc is more reactive than copper, so it displaces Cu from CuSO₄ solution and blue colour of CuSO₄ turns to colourless due to the formation of ZnSO₄.

Q.16. In the following reaction, A and B are metals and BX is a salt of metal B:
A + BX → AX + B
Which one of the two metals is more reactive? Give reason.

A is more reactive as it displaces B from its salt solution BX.