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Metals and Non- Metals Test - 1

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Metals and Non- Metals Test - 1
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  • Question 1
    1 / -0

    One day, Geeta went to a jeweller's shop to give her old gold jewellery for polish. When she brought the jewellery back, she found that there was a slight loss in its weight. The main reason for weight loss of gold jewellery is when a goldsmith dips the jewellery in

    Solution

    A goldsmith dips jewellery in a solution of aqua regia (a 1 : 3 mixture of concentrated nitric acid and concentrated hydrochloric acid). It is a very strong acid and can dissolve noble metals like gold, platinum and silver etc. That's why, when jeweller dips gold jewellery in this liquid, the upper layer is removed. Due to this, gold jewellery shines but its weight is lost.

     

  • Question 2
    1 / -0

    Riya's class teacher explained the physical properties of non-metals. According to her teacher, the non-metal that is in solid state and has lustre is

    Solution

    Iodine is the non-metal which is in solid state and has lustre.

     

  • Question 3
    1 / -0

    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
    Solution

    All are correctly matched.

    i. Phosphorous and nitrogen are important constituents of fertiliser, which is essential for plant's growth.
    ii. Iodine mixed with alcohol acts as an antiseptic.
    iii. Chlorine acts as a disinfectant.
    iv. Oxygen is the most important part of our environment, which is essential for breathing of all living world.

     

  • Question 4
    1 / -0

    Ram's class teacher, while explaining the acidic and basic nature of metals and non-metals, tells that metallic oxides are basic in nature while non-metal oxides are acidic in nature. According to her, the aqueous solution of oxide that converts blue litmus into red is

    Solution

    Sulphur dioxide is a non-metallic oxide. Its aqueous solution is acidic in nature and converts blue litmus red.

     

  • Question 5
    1 / -0

    According to Sweta's class teacher, metals are good conductors of electricity and heat. She tells Sweta about a liquid metal that is used in thermometers to test body temperature. The name of that liquid metal is

    Solution

    Mercury is the liquid metal that is used in thermometers.

     

  • Question 6
    1 / -0

    A substance 'X', when burnt in air, leaves a white residue. The aqueous solution of this white residue turns red litmus blue. The substance 'X' and its chemical nature is

    Solution

    The given substance 'X' is a metal. When burnt in air, it produces a white residue of its oxide. The aqueous solution of metallic oxide is basic in nature and turns red litmus blue.

     

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