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Metals and Non-metals Test - 13

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Metals and Non-metals Test - 13
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  • Question 1
    1 / -0

    Pyrolusite is an ore of:

    Solution
    Pyrolusite is a mineral consisting essentially of manganese dioxide (MnO2). It is an important ore of manganese. It is a black, amorphous mineral, often with a granular, fibrous or columnar structure.
    It has a metallic luster, a black or bluish-black streak and readily soils the fingers.
    Hence, the correct option is (A).
  • Question 2
    1 / -0

    Which element is stored in water and which element is stored in kerosene?

    Solution
    Phosphorus is stored in water because phosphorus is very reactive non metal. It catches fire if exposed to air. To prevent the contact of phosphorus with atmospheric oxygen, it is stored in water. Whereas, sodium is very reactive. It reacts vigorously with oxygen and water. A lot of heat is generated in the reaction. It is, therefore,stored in kerosene.
    Hence, option (B) is correct.
  • Question 3
    1 / -0

    2Al+Fe2O3→2Fe+Al2O3+Heat. This reaction is an example of:

    Solution
    This reaction is an example of thermite process (also known as the Goldschmidt process). When aluminum powder reacts with iron oxide, a large amount of heat is released and a temperature of about 3500°C is attained which is enough to weld broken metallic parts.
    Hence, the correct option is (C).
  • Question 4
    1 / -0

    Ayush is putting H2SO4 in the test tube containing water whereas Piyush is putting water in the test tube containing H2SO4. Which of the two is likely to face danger?

    Solution
    Piyush is likely to face danger. Addition of water to concentrated sulphuric acid is an exothermic reaction and can lead to explosions. Water should not be poured directly into a container containing an acid.
    Hence, the correct option is (C).
  • Question 5
    1 / -0

    What are the main impurities present with bauxite ore?

    Solution
    Bauxite is the principal ore of aluminium. Bauxite usually contains silica (SiO2), iron oxides and titanium oxide (TiO2) as impurities. Leaching is often used if the ore is soluble in some suitable solvent. Bauxite is purified using leaching.
    Hence, the correct option is (A).
  • Question 6
    1 / -0

    Copper sulphate (CuSO4) is:

    Solution
    Hydrated copper sulphate (CuSO4) is blue in colour. When water is added to anhydrous copper sulphate, it turns into the pentahydrate form, acquiring a blue colour, and is commonly known as blue vitriol.
    Hence, the correct option is (D).
  • Question 7
    1 / -0

    The following metals exist in their native state:

    Solution
    Precious metals such as Gold (Au), Silver (Ag) and Platinum( Pt) are rare and chemically tend to be less reactive than other metals so they occur freely in nature.
    Hence, the correct option is (C).
  • Question 8
    1 / -0

    The melting point of NaCl is:

    Solution
    The melting point of NaCl is 801oC or 1074 K
    Hence, the correct option is (A).
  • Question 9
    1 / -0

    Iron pillar at Delhi is made up of:

    Solution
    The Iron Pillar of Delhi is nearly 24 feet tall . It weighs more than 6 tons and made of 98% wrought iron. Pillar was crafted using forge welding.
    Hence, the correct option is (D).
  • Question 10
    1 / -0

    Before keeping any eatables in the jar, Riya always keeps anhydrous CaCl2 in the bottle to:

    Solution

    Anhydrous calcium chloride is used to absorb moisture or as a packaging aid to ensure dryness.

    Hence, the correct option is (B).

  • Question 11
    1 / -0

    Metal which is liquid at room temperature is:

    Solution
    Mercury is present in liquid state at room temperature. Lead, sodium and silver are solids.
    Hence, the correct option is (D).
  • Question 12
    1 / -0

    Which process is used for the enrichment of oxide ores?

    Solution
    Methods of enrichment of ore:
    Magnetic separation:
    This method is used for the concentration of magnetic ores of iron (magnetite and chromite) and manganese (pyrolusite) by removing non-magnetic impurities present in them. This process involves the use of a magnetic separator.
    Hydraulic Washing
    This method is used for the enrichment of those ores which are heavier than gangue particles present in them. In this method, a stream of water is passed through crushed and finely powdered ore. The Lighter gangue particles are washed away with water while the heavier ore particles are left behind. Oxide ores of tin and lead are concentrated by this method.
    Froth Floatation Process
    This method is used for the concentration of sulphide ores of copper, lead, and zinc. In this method, powdered ore is put in a tank full of water. And then, some Pine oil is added to it. In the tank, the particles of sulphide ore are wetted by pine oil whereas the gangue particles are wetted by water. Then the air is passed through this mixture. This results in the agitation of water in the tank, which causes the sulphide ore particles to stick with the oil and rise to the surface in the form of froth. The gangue particles being heavier remain behind at the bottom of the water tank. The froth is separated and concentrated sulphide ore is obtained from it.
    Hence, the correct options are (A),(C) and (D).
  • Question 13
    1 / -0

    Galvanisation process involves elements zinc and iron. Which of the two metals is sacrificing its life to save the life of the other?


    Solution
    Galvanisation is the process of applying a protective coating of zinc to iron to prevent the rusting of iron. The most common method is hot dip galvanizing, in which iron parts are submerged in a bath of molten zinc.
    Hence, the correct option is (D).
  • Question 14
    1 / -0

    “Ringing of bell in the temple” is associated with which property of metal:

    Solution

    Most metals are sonorous i.e. they produce a deep and ringing sound when hit.

    Hence, the correct option is (B).

  • Question 15
    1 / -0

    Which of the following alloy is used for joining metals for electrical work?

    Solution
    Solder is a fusible metal alloy of tin and lead used to join metals for electrical work.
    It is used to connect metal workpieces. The choice of specific solder alloys depends on their melting point, chemical reactivity, mechanical properties, toxicity, and other properties
    Hence the correct option is (D).
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