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Chemistry Test 125
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Chemistry Test 125
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  • Question 1/10
    1 / -0.25

    Metals can be in ____ state at room temperature.

    Solutions
    All metals except Mercury are solid at room temperature. Mercury is the only metallic element that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under 'these conditions is bromine.
  • Question 2/10
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    The chief constituent of Natural gas is_____.
    Solutions
    Natural gas is a naturally occurring hydrocarbon gas mixture consisting primarily of methane (CH4). However it also includes varying amounts of other higher alkanes (ethane, propane), and a small percentage of carbon dioxide, nitrogen, hydrogen sulfide, or helium.
  • Question 3/10
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    Which of the following substance's smell is similar to Ethanoic acid?
    Solutions
    Acetic acid, also known as ethanoic acid, is an organic chemical compound best recognized for giving vinegar its sour taste and pungent smell. Vinegar is roughly 3-9% acetic acid by volume, making acetic acid the main component of vinegar apart from water.
  • Question 4/10
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    Which of the following acids serves as an electrolyte in a lead storage battery?
    Solutions
    Dilute sulfuric acid (H2S04) serves as the electrolyte in a lead-acid battery. Dilute sulfuric acid used for lead acid battery has ratio (to water) of 3:1 other components of the battery include: Lead peroxide (PbO2) and Sponge lead (Pb).
  • Question 5/10
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    Which of the following is not a natural source of hydrocarbon?
    Solutions
    There are three main natural sources of hydrocarbons: natural gas, petroleum and coal. Mica is a natural occur ­ ring mineral that is based on a collection of silicate minerals and composed of varying amounts of potassium. iron, aluminium, magnesium and water. It is widely used in the electrical industry.
  • Question 6/10
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    Which of the following is used to make light weight, but strong plastic?
    Solutions
    • Polyvinyl chloride (PVC) is a common, strong but light ­weight plastic that is used in making tough plastic.
    • It is used for flexible applications such as insulating cables. It is the third-most widely produced synthetic plastic polymer, after polyethylene and polypropylene. 
  • Question 7/10
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    White phosphorus is generally kept under_____.
    Solutions
    • White Phosphorous is kept under water because it reacts with oxygen but not water. 
    • White phosphorus is a translucent white solid,is poisonous and insoluble in water. It glows in the dark (Chemiluminiscence). It is less stable and hence,more reactive.
  • Question 8/10
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    The wire of flashbulbs is made up of
    Solutions
    The wire of flashbulbs is made up of magnesium. Magnesium filaments contained in bulbs is filled with oxygen gas, and is electrically ignited by a contact in the camera shutter. A major purpose of a flash is to illuminate a dark scene. Hence, option A is the right answer.
  • Question 9/10
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    Which of the following is colourless?
    Solutions
    • Oxygen is a chemical element with symbol O and atomic number 8.
    • At standard temperature and pressure, two atoms of the oxygen bind to form dioxygen, a colourless and odourless diatomic gas with the formula O2.
  • Question 10/10
    1 / -0.25
    Which of the following fuels causes minimum environmental pollution?
    Solutions
    Hydrogen causes minimum environmental pollution. When hydrogen is burnt to produce fuel, the byproducts are totally safe, which means, they have no known side effects. 
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