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Displacement and the reactivity series

This type of question, asked 4 times: 2023, 2024, 2025, 2026. All 8 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2023

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    17
    Assertion (A) : The colour of aqueous solution of copper sulphate turns colourless when a piece of lead is added to it. Reason (R) : Lead is more reactive than copper, and hence displaces copper from its salt solution.

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  2. Question 2

    2024

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    17
    Assertion (A) : Different metals have different reactivities with water and dilute acids. Reason (R) : Extraction of a metal from its ore depends on its position in the reactivity series.

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  3. Question 3

    2025

    21
    A light green coloured solution of sulphate salt of metal ‘P’ is taken in a beaker, a rod of another metal “Q’ is put in this solution as shown the following figures : Identify the metals ‘P’ and ‘Q’ and write its chemical equation for the reaction that occurs. State the conclusion of this reaction in terms of reactivity series of metals.

  4. Question 4

    2025

    28
    Samples of four metals A, B, C and D were added one by one to the following solutions. The results obtained were tabulated as follows :
    Metal / SolutionIron SulphateCopper SulphateZinc SulphateAluminium Sulphate
    A–DisplacementNo reactionNo reaction
    BDisplacementDisplacementDisplacement–
    CDisplacement?–No reaction
    DNo reactionNo reactionNo reactionNo reaction
    Use the table above to answer the following questions about metals A, B, C and D : (i) Which is the least reactive metal? (ii) What would be observed if C is added to a solution of copper sulphate? (iii) Arrange the metals A, B, C and D in the order of their decreasing reactivity.

  5. Question 5

    2025

    2
    A metal, M, displaces iron from aqueous solution of ferrous sulphate but fails to do so in case of aqueous solution of aluminium sulphate. The metal M is

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  6. Question 6

    2025

    28
    Study the experimental set-up given in the figure and answer the following questions : (a) Identify these metals from the following which can be used as “metal sample” in the given set-up : Aluminium, Copper, Iron, Lead, Silver (b) Write balanced chemical equations for the reaction in each case.

  7. Question 7

    2026

    25
    One student was comparing the reactivity of different metals for his science project. He added iron filings in four test tubes A, B, C and D containing aqueous solutions of ZnSO4\mathrm{ZnSO_4}, CuSO4\mathrm{CuSO_4}, FeSO4\mathrm{FeSO_4} and Al2(SO4)3\mathrm{Al_2(SO_4)_3}. (i) In which of the test tubes will he observe the reaction to be the most vigorous and why ? (ii) Write a balanced equation for the reaction involved.

  8. Question 8

    2026

    23
    On reaction with dilute HCl\mathrm{HCl}, which of the following pair of metals will evolve hydrogen gas ?

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