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Materials Metal...

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  • Question 1
    1 / -0

    Properties of substances W, X, Y and Z are listed below:

    W, X, Y and Z are respectively

    W: A liquid metal
    X: A liquid non-metal
    Y: Gaseous non-metal
    Z: A non-metal which conducts electricity.

     

  • Question 2
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    (I) An unknown metal X when placed in copper sulphate solution, red brown pieces of copper fall to the bottom of the test tube.

    (II) When metal X is placed in aluminium sulphate solution, no change is observed. Metal X can be

  • Question 3
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    Substance X reacts with dilute HCI violently, V reacts slowly while Z does not react at all. X, Y and Z could be respectively

  • Question 4
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    Which of the following reactions are possible?

    (i) Mg + CuSO4 → MgSO4 + Cu
    (ii) Ca + MgSO4 → CaSO4 +  Mg
    (iii) Cu + ZnSO4 → CuSO4 + Zn
    (iv) Fe + MgSO4 → FeSO4 + Mg

  • Question 5
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     Match column I with column II and select the correct option from the codes given below.

    Column I Column II
    A non-metal, essential for respiration (i) Graphite
    A non-metal, the source of energy in Sun (ii) Silicon
    A non-metal, good conductor of electricity (iii) Oxygen
    A non-metal, used in semiconductors (iv) Hydrogen

  • Question 6
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     Which of the following statements is incorrect?

  • Question 7
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    What will happen if you keep a solution of copper sulphate in an iron container for a few days? What is the reason for your observation?

  • Question 8
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    (I) Kanika takes a burning substance and collects the evolved vapours in a test tube, making sure that they do not escape.

    (II) A small amount of water is added to the test tube. To the solution obtained, a few drops of blue litmus solution are added. The litmus solution turns red. Which of the following could be the burning substance?

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