Metal Reactivity with Salt Solutions MCQs Quiz | Class 10
This quiz for Class: X, Subject: Science (Code 086), Unit: Practicals (Unit I) covers Metal Reactivity with Salt Solutions, specifically involving Zn, Fe, Cu, Al with ZnSO4/FeSO4/CuSO4/Al2(SO4)3, and how to arrange them in reactivity order. Attempt all questions and click ‘Submit Quiz’ to see your score and review answers. Download your personalized PDF answer sheet for future reference.
Understanding Metal Reactivity with Salt Solutions
Metal reactivity is a fundamental concept in chemistry, especially when dealing with displacement reactions. The reactivity series is a list of metals arranged in the order of their decreasing reactivity. A more reactive metal can displace a less reactive metal from its salt solution.
Key Concepts Covered:
- Reactivity Series: Understanding the relative positions of metals like Aluminium (Al), Zinc (Zn), Iron (Fe), and Copper (Cu).
- Displacement Reactions: When a more reactive metal reacts with the salt solution of a less reactive metal, it displaces the less reactive metal.
- Observations: Learning to predict and interpret changes like color changes, precipitate formation, or no reaction.
Reactivity Order for Zn, Fe, Cu, Al:
Based on their positions in the reactivity series, the order from most reactive to least reactive for the metals covered is:
Aluminium (Al) > Zinc (Zn) > Iron (Fe) > Copper (Cu)
Interaction of Metals with Salt Solutions:
Let’s look at specific examples involving Zn, Fe, Cu, Al with their respective sulfates:
| Reactants | Reaction Outcome | Reason |
|---|---|---|
| Zn + CuSO4 | ZnSO4 + Cu (Zinc sulfate solution and reddish-brown copper deposit) | Zinc is more reactive than copper. |
| Fe + CuSO4 | FeSO4 + Cu (Ferrous sulfate solution and reddish-brown copper deposit) | Iron is more reactive than copper. |
| Cu + ZnSO4 | No Reaction | Copper is less reactive than zinc. |
| Cu + FeSO4 | No Reaction | Copper is less reactive than iron. |
| Al + FeSO4 | Al2(SO4)3 + Fe (Aluminum sulfate solution and grayish iron deposit) | Aluminum is more reactive than iron. |
| Al + CuSO4 | Al2(SO4)3 + Cu (Aluminum sulfate solution and reddish-brown copper deposit) | Aluminum is more reactive than copper. |
| Fe + ZnSO4 | No Reaction | Iron is less reactive than zinc. |
| Zn + Al2(SO4)3 | No Reaction | Zinc is less reactive than aluminum. |
These examples illustrate that a metal will only displace another metal if it is higher in the reactivity series than the metal in the salt solution.
Quick Revision Points:
- Reactivity of metals decreases down the reactivity series.
- A more reactive metal displaces a less reactive metal from its salt solution.
- If the metal is less reactive than the metal in the salt solution, no reaction occurs.
- Common observations include color changes (e.g., blue CuSO4 becoming colorless ZnSO4) and solid deposition.
Practice Questions:
- Which metal, among zinc and iron, would react with dilute hydrochloric acid more vigorously?
- Can a solution of magnesium sulfate be stored in an aluminum container? Justify your answer.
- What would you observe if a piece of lead is added to a solution of copper chloride? (Lead is more reactive than copper).
- Name two metals that are less reactive than hydrogen and two that are more reactive than hydrogen.
- A student added a few pieces of silver metal into a test tube containing a solution of copper sulfate. What change, if any, will be observed?
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