8th Class Science Sample Paper Science Olympiad Model Test Paper-2

  • question_answer
    Albert performs the following steps during experiment in chemical laboratory:
    Step 1: He takes 5 ml of dilute copper sulphate solution in a test tube that is blue in colour. He places a thin plate of zinc metal in solution and stir the solution for a few minutes. He notices that the blue colour of the solution fades away and red precipitate of copper settle down.
    Step 2: Again he takes zinc sulphate solution in a test tube and place a copper wire in it. Shake it for some time and see if there is any change in colour or any precipitate is formed. He notices that there is no change in the colour of the solution, and no precipitate is formed.
    Which one of the following is true about the conclusion of experiment performed by Albert?

    A) No conclusion can be drawn from the above experiment.

    B) More reactive metal can displace less reactive metals.

    C) Less reactive metal can displace more reactive metals.

    D) Step 1 is meaningful experiment whereas step 2 is meaning less experiment.

    E) None of these

    Correct Answer: B


You need to login to perform this action.
You will be redirected in 3 sec spinner