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Chemistry Test 119
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Chemistry Test 119
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  • Question 1/10
    1 / -0.25
    Glycol is added to aviation gasoline because it
    Solutions
    Glycol is added to aviation gasoline because it prevents freezing of petrol.
    Fuel system icing inhibitor (FSII) is an additive to aviation fuels that prevents the formation of ice in fuel lines. FSII is sometimes referred to by the registered, genericized trademark Prist. Jet fuel can contain a small amount of dissolved water that does not appear in droplet form. As an aircraft gains altitude, the temperature drops and Jet fuel's capacity to hold water is diminished. Dissolved water can separate out and could become a serious problem if it freezes in fuel lines or filters, blocking the flow of fuel and shutting down an engine.
    Hence, option C is correct.
  • Question 2/10
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    Rusting of iron requires _____.
    Solutions
    • Rusting of iron consists of the formation of hydrated oxide, Fe(OH)3, FeO(OH), or even Fe2O3.H2O.
    • It is an electrochemical process which requires the presence of water, oxygen and an electrolyte.
  • Question 3/10
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    Glass is a?
    Solutions
    • Antique windowpanes are thicker at the bottom, because glass has flowed to the bottom over time. Glass has no crystalline structure, hence it is NOT a solid.
    • Glass is a super cooled liquid. Glass is a liquid that flows very slowly.
  • Question 4/10
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    Which among the following is used to dilute oxygen In the gas cylinders used by divers?
    Solutions
    Helium is a chemical element with symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gas group in the periodic table. Its boiling and melting points are the lowest among all the elements.
  • Question 5/10
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    Name the gas used in preparation of bleaching powder
    Solutions
    Bleaching powder is made up with lime and calcium chloride. It’s used as a cleaning agent, as a disinfectant, among other things.
  • Question 6/10
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    The beach sands of Kerala are rich in _______.
    Solutions
    Kerala is rich in the mineral- thorium. This particular mineral is the key to India’s third stage of three-stage nuclear power programme.
    This three-stage programme was formulated by Homi Bhabha in the 1950s in order to tap the huge thorium reserve of India found in the monazite sand of Kerala.
  • Question 7/10
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    The chemical that is used to ripen mangoes is_______ .
    Solutions

    • Calcium carbide i.e. CaC2 is a chemical compound that has its application mainly in the making of acetylene and calcium cyanamide.

    • In terms of mango ripening, it works by producing acetylene gas when is exposed to moisture. This process is quite similar in reaction to the natural ripening agent ethylene. Hence option B is the right answer.

  • Question 8/10
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    Which one of the following is a water soluble vitamin?
    Solutions
    A vitamin that can dissolve in water. Water-soluble vitamins are carried to the body's tissues but are not stored in the body. Vitamin C and members of the vitamin B complex are water-soluble.
  • Question 9/10
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    Natural rubber is a polymer of __________
    Solutions
    Natural rubber, also called India rubber or caoutchouc, as initially produced, consists of polymers of the organic compound isoprene, with minor impurities of other organic compounds, plus water. Malaysia and Indonesia are two of the leading rubber producers.
  • Question 10/10
    1 / -0.25
    Which is known as carbolic acid?
    Solutions
    Phenol also known as carbolic acid, is an aromatic organic compound. It is mildly acidic and requires careful handling due to its propensity to cause chemical burns. It is generally produced from petroleum.
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