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Chemistry Test 116
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Chemistry Test 116
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  • Question 1/10
    1 / -0.25
    Which of the following alkaloid is found naturally in coffee, cocoa and cola nut?
    Solutions
    • The alkaloid naturally found in Coffee, Cocoa and Cola nut is a Caffeine.
    • Caffeine is a drug that is naturally produced in the leaves and seeds of several plants.
    • It is a central nervous system stimulant of the methylxanthine class.
    • It is a bitter-tasting, white & odourless powder.
  • Question 2/10
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    In the industrial production of vegetable ghee, the process involved is
    Solutions
    In the industrial production of vegetable ghee, the process involved is reduction.
    Hence, option B is correct.
  • Question 3/10
    1 / -0.25
    The noble gas used in radiotherapy is
    Solutions
    Despite the noble gas radon being highly radioactive and able to cause cancer, it can also be used as part of radiotherapy treatments to control or kill malignant cells.
  • Question 4/10
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    The mercury and sodium street lamps light up because of
    Solutions
    • The mercury and sodium street lamps light up because of Atomic emission.
    • Use for illumination of streets.
    • These street lamp is made of material highly resistant to all atmospheric conditions, such as, for example, high and low temperatures.
  • Question 5/10
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    Heavy metals got their names because compared to other atoms they have
    Solutions
    • Heavy metals got their names because compared to other atoms they have higher densities.
    • Examples of heavy metals include gallium, thallium, and hafnium.
  • Question 6/10
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    Which chemical is used in developing photographic films?

    Solutions
    • Photographic film is a strip of transparent plastic film base coated on one side with a gelatin emulsion.
    • It contains small light-sensitive silver halide crystals.
    • It is used to record pictures.
    • The light sensitivity of the silver halides is key to the photographic process, that's why silver chloride, silver bromide and silver iodide, are used to make photographic film.
  • Question 7/10
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    Acid rain is caused due to pollution of atmosphere by
    Solutions
    Acid rain is caused by emissions of sulfur dioxide and nitrogen oxides, which react with the water molecules in the atmosphere to produce acids.
  • Question 8/10
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    Nitric acid does not react with
    Solutions
    Nitric acid is made by reaction of nitrogen dioxide (NO2) with water. Normally, the nitric oxide produced by the reaction is reoxidized by the oxygen in air to produce additional nitrogen dioxide. Bubbling nitrogen dioxide through hydrogen peroxide can help to improve acid yield. Some precious metals, such as pure gold and platinum-group metals do not react with nitric acid, though pure gold does react with aqua regia, a mixture of concentrated nitric acid and hydrochloric acid. The principal chemical produced from nitric acid is ammonium nitrate. Most of this is used in fertilizers, although a relatively small amount is used to make explosives. Some nitric acid is used as an intermediate in the polymer industry, notably in the manufacture of polyamides and polyurethanes.
  • Question 9/10
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    An eudiometer measures_______.
    Solutions
    Eudiometer measures the volume of gases. It is a graduated glass tube in which the mixtures of gases can be made to react by an electric spark.
  • Question 10/10
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    What is the melting point of Mercury?
    Solutions
    The melting point of Mercury is -38.83 oC and its boiling point is 356.58oC.
    • It is named after the Roman God and the planet, Mercury.
    • The symbol, Hg, comes from hydrargyrum, a Latinized form of the Greek word hydrargyros, which means water combined with silver.
    • Its atomic number is 80.
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