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Metals And Non-...

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  • Question 1
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    Which of the following statements are correct?

    1. Metalloids are called semi-metals.
    2. Metalloids are used as semi-conductors.
    3. Metalloids are impure metals.
    4. Metalloids are pure non-metals.

  • Question 2
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    Which of the following statements is incorrect?

  • Question 3
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    Transition metals exhibit properties like high melting point and high tensile strength because

  • Question 4
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    'X' and 'Y' are examples of acidic and neutral non-metallic oxides.

    Choose from the options given below, the one that is a suitable illustration of 'X' and 'Y'.

  • Question 5
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    Match Column - A (non-metal) with Column - B (with their uses).

    Column - A Column - B
    (i) Phosphorus and nitrogen (a) Essential for breathing
    (ii) Iodine (b) Disinfectant
    (iii) Chlorine (c) Essential for plant growth
    (iv) Oxygen (d) Antiseptic

  • Question 6
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    Consider the following physical properties:

    (i) Low melting and boiling points
    (ii) Formation of alloys and amalgams
    (iii) Highly lustrous
    (iv) Non-conductor of heat and electricity
    (v) Low density

    Which of the given physical properties are shown by sulphur and phosphorus?

  • Question 7
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    Metals have free electrons in their valence shells, and show electrical and thermal conductance. Which of the following elements is a poor conductor of electricity?

  • Question 8
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    Which of the following represents the pairs of metalloids?

    (a) Si and Sb
    (b) Pb and Sb
    (c) Ru and Rh
    (d) Ge and As

  • Question 9
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    Metals are electropositive elements and their reactivity depends on their ability to lose one or more of their valence electrons. Which of the following properties is expected to increase the reactivity of the metals?

  • Question 10
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    Chromium has a higher melting point than manganese because

  • Question 11
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    Gold is soluble in

  • Question 12
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    Which of the following will not be formed when steam is passed over red-hot iron?

  • Question 13
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    Elements that react violently on exposure to air are

  • Question 14
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    Observe the following chemical equation and the related analogy.

    H2S + Cl2 S + 2HCl

    Substance reduced : Oxidising agent : : __ : Cl2

    The correct alternative that suits the analogy is:

  • Question 15
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    Which one of the following possesses covalent, ionic and coordinate bonds?

  • Question 16
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    Silver gets tarnished in air by the formation of

  • Question 17
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    Gunpowder contains a mixture of

  • Question 18
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    Choose the correct option about the following statements.

    A. Gallium sheets are used more than gallium wires.
    B. Gallium exhibits ductility property but not the malleability.

  • Question 19
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    Which of the following gases is produced during calcination?

  • Question 20
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    Which of the following ores cannot be reduced by carbon?

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