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Chemistry Test 67
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Chemistry Test 67

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  • Question 1/10
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    Atomic number of the element is equal to _____.
    Solutions
    Atomic number is the number of protons and therefore also the total positive charge in the atomic nucleus.
  • Question 2/10
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    The material used in the manufacture of lead pencil is
    Solutions
    • The most common types of pencil are made of a mixture of clay and graphite and their darkness varies from light grey to black.
    • Graphite archaically referred to as Plumbago, is a crystalline form of carbon, a semimetal, a native element mineral, and one of the allotropes of carbon. Graphite is the most stable form of carbon under standard conditions. 
  • Question 3/10
    1 / -0
    Choose the correct statement:
    Solutions
    • Mixtures can be either homogeneous or heterogeneous. Hence option (1) is incorrect.
    • Mixtures can have any amounts of ingredients. Hence option (2) is incorrect.
    • Homogeneous and heterogeneous mixtures can be separated into their components by several physical methods. The choice of separation techniques is based on the type of mixture and difference in the chemical properties of the constituents of a mixture. Hence option (3) is incorrect.
    • Mixtures are the one product of a mechanical blending or mixing of chemical substances like elements and compounds, without chemical bonding or other chemical change, so that each ingredient substance retains its own chemical properties and makeup. Hence option(4) is correct 
  • Question 4/10
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    The aluminium surface is 'anodized'. This mean _____ is deposited.
    Solutions
    • Anodisation is a process used for the surface treatment of aluminium.
    • During this process, an oxidic protective layer is created on the metal by means of anodising.
    • It is an electrochemical process that converts the metal surface into a decorative, durable, corrosion-resistant, anodic oxide finish
  • Question 5/10
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    Nuclear fallout contains
    Solutions
    Nuclear fallout, or simply fallout, is the residual radioactive material propelled into the upper atmosphere following a nuclear blast or a nuclear reaction conducted in an unshielded facility, so called because it "falls out" of the sky after the explosion and shock wave have passed. At the time of nuclear reaction alpha and Beta particles comes out.
  • Question 6/10
    1 / -0
    Acid rain is caused by_____.
    Solutions
    Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide (SO2) and nitrogen oxides (NO2) are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.
  • Question 7/10
    1 / -0
    Which one out of the following helps in burning?
    Solutions
    Fire is the result of a chemical reaction called combustion, a type of oxidation reaction that occurs when a combustible fuel is exposed to a source of heat in the presence of oxygen.
  • Question 8/10
    1 / -0
    The term reactor referred to in waste water treatment is
    Solutions

    • The term reactor referred to in waste water treatment is Aeration tank.

    •  Aeration brings water and air in close contact in order to remove dissolved gases (such as carbon dioxide) and oxidizes dissolved metals such as iron, hydrogen sulfide, and volatile organic chemicals (VOCs).

    •  Aeration is often the first major process at the treatment plant.

  • Question 9/10
    1 / -0
    Cataytic converters are generally made from
    Solutions

    • A Catalytic converter is an exhaust emission control device that converts toxic gases and pollutants in exhaust gas from an internal combustion engine into less-toxic pollutants by catalyzing a redox reaction.

    • Earlier it was constituted of an inert material coated with platinum, iridium and palladium, sealed into a double metallic cylinder.

    • They are generally made up of transition metals.

  • Question 10/10
    1 / -0
    Choose the incorrect statement pertaining to organic compounds
    Solutions
    Typical organic compounds are combustible by nature as they contains carbon. Organic compounds mostly consist of carbon, hydrogen, halogen, and phosphorus. Organic compounds are essentially covalent compounds. They show characteristics of covalent compounds.
    a)They are volatile in nature.
    b)They have low melting and boiling points.
    c)They are generally insoluble in water but soluble in organic solvents.
    d)They are bad conductors of electricity.
    e)They do not furnish ions. They show molecular reactions.
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